Robert Frei

Chemostratigraphy of early Ediacaran carbonate rocks of the Cachoeirinha Group (Northeastern Brazil): Implications for paleonvironmental conditions and atmospheric oxygenation

Usma, C. D., Sial, A. N., Ferreira, V. P., Gaucher, C. & Frei, Robert, 2024, In: Journal of South American Earth Sciences. 134, 17 p., 104744.

Research output: Contribution to journal › Journal article › Research › peer-review

Combined cadmium and chromium isotopes record a collapse of bioproductivity across the Cretaceous—Paleogene boundary in the Danish basin

Frederiksen, Jesper Allan, Thibault, Nicolas Rudolph, Gilleaudeau, G. J., Bjerrum, Christian J., Moreau, J. & Frei, Robert, 2024, In: Chemical Geology. 654, 122058.

Research output: Contribution to journal › Journal article › Research › peer-review

Geochemistry of Archean anorthosite-bearing layered intrusions

Sotiriou, P., Polat, A., Kusky, T., Windley, B. F., Frei, Robert & Yang, X., 2024, In: Earth-Science Reviews. 249, 25 p., 104654.

Research output: Contribution to journal › Journal article › Research › peer-review

Chromium isotopes track redox fluctuations in Proterozoic successions of the Chapada Diamantina, São Francisco craton, Brazil

Caxito, F. A., Frei, Robert, Sial, A. N., Uhlein, G. J., de Moura, W. A. L., Pereira, E. & Rodrigues, R., 2023, In: Geology. 51, 1, p. 69-74

Research output: Contribution to journal › Journal article › Research › peer-review

Geological processes defining the formation of plumasite-type corundum in the Paleoproterozoic Isertoq Terrane, South-East Greenland

Poulsen, Majken Djurhuus, Keulen, N., van Hinsberg, V. J., Kolb, J., Frei, Robert & Thomsen, T. B., 2023, In: Precambrian Research. 385, 23 p., 106940.

Research output: Contribution to journal › Journal article › Research › peer-review

Release and mobility of hexavalent chromium in contaminated soil with chemical factory waste: Experiments, Cr isotope analysis and reactive transport modeling

Ceballos, E., Cama, J., Soler, J. M. & Frei, Robert, 2023, In: Journal of Hazardous Materials. 451, 15 p., 131193.

Research output: Contribution to journal › Journal article › Research › peer-review

Strong positive fractionation of chromium isotopes in iron formation of the Jacadigo Group (Brazil) – A link to enhanced atmospheric oxygenation during the Late Neoproterozoic

Árting, T. B., Boggiani, P. C., Gaucher, C., Fernandes, H. A. & Frei, Robert, 2023, In: Gondwana Research. 124, p. 39-60

Research output: Contribution to journal › Journal article › Research › peer-review

Tales from Ginderup Mound in Thisted County, Denmark: Further Investigations of Female Mobility in the Nordic Bronze Age

Reiter, S. S., Møller, N. A., Jørkov, M L S, Bech, J., Frei, Robert & Frei, Karin Margarita, 2023, In: Danish Journal of Archaeology. 12, 1, p. 1-25

Research output: Contribution to journal › Journal article › Research › peer-review

High-resolution Ge-Si-Fe, Cr isotope and Th-U data for the Neoarchean Temagami BIF, Canada, suggest primary origin of BIF bands and oxidative terrestrial weathering 2.7 Ga ago

Bau, M., Frei, Robert, Garbe-Schönberg, D. & Viehmann, S., 1 Jul 2022, In: Earth and Planetary Science Letters. 589, 9 p., 117579.

Research output: Contribution to journal › Journal article › Research › peer-review

Cadmium isotopes in Late Ediacaran–Early Cambrian Yangtze Platform carbonates – reconstruction of bioproductivity in ambient surface seawater

Frederiksen, Jesper Allan, Wei, W., Rugen, E. J., Ling, H. & Frei, Robert, 30 May 2022, In: Palaeogeography, Palaeoclimatology, Palaeoecology - An International Journal for the Geo-Sciences. 601, 18 p., 111096.

Research output: Contribution to journal › Journal article › Research › peer-review

The proper choice of proxies for relevant strontium isotope baselines used for provenance and mobility studies in glaciated terranes – Important messages from Denmark

Frei, Robert, Frank, A. B. & Frei, K. M., 15 May 2022, In: Science of the Total Environment. 821, 13 p., 153394.

Research output: Contribution to journal › Journal article › Research › peer-review

Geochemical signatures of soapstones from the Nuuk area, southern West Greenland – their use for fingerprinting of archaeological artefacts

Keulen, N., Poulsen, M. D. & Frei, Robert, Apr 2022, In: Journal of Archaeological Science. 140, 15 p., 105552.

Research output: Contribution to journal › Journal article › Research › peer-review

Uranium isotope cycling on the highly productive Peruvian margin

Bruggmann, S., Gilleaudeau, G. J., Romaniello, S. J., Severmann, S., Canfield, D. E., Anbar, A. D., Scholz, F. & Frei, Robert, 20 Feb 2022, In: Chemical Geology. 590, 12 p., 120705.

Research output: Contribution to journal › Journal article › Research › peer-review

Investigating sheep mobility at Montale, Italy, through strontium isotope analyses

Sabatini, S., Frei, K. M., De Grossi Mazzorin, J., Cardarelli, A., Pellacani, G. & Frei, Robert, Feb 2022, In: Journal of Archaeological Science: Reports. 41, 12 p., 103298.

Research output: Contribution to journal › Journal article › Research › peer-review

A multi-proxy, bioavailable strontium isotope baseline for southern Almería, Spain: Using modern environmental samples to constrain the isotopic range of bioavailable strontium

Frank, A. B., Frei, Robert, Kristiansen, K. & Frei, Karin Margarita, 2022, In: Applied Geochemistry. 144, 14 p., 105405.

Research output: Contribution to journal › Journal article › Research › peer-review

Anatomy of a Neoarchean continental arc-backarc system in the Cross Lake-Pipestone Lake region, northwestern Superior Province, Canada

Polat, A., Frei, Robert, Deng, H., Yang, X. & Sotiriou, P., 2022, In: Precambrian Research. 370, 34 p., 106556.

Research output: Contribution to journal › Journal article › Research › peer-review

C, Sr, Nd isotope chemostratigraphy and zircon provenance of the Witvlei Group (Namibia): Neoproterozoic glaciations and seawater evolution

Hohl, S. V., Rodler, A. S., Viehmann, S., Huang, X., Xu, J., Gaucher, C., Germs, G. J. B., Hegenberger, W., Goderis, S., Wei, H. & Frei, Robert, 2022, In: Precambrian Research. 372, 20 p., 106600.

Research output: Contribution to journal › Journal article › Research › peer-review

Cadmium isotopes in Bahamas platform carbonates: A base for reconstruction of past surface water bioproductivity and their link with chromium isotopes

Frederiksen, Jesper Allan, Klaebe, R. M., Farkas, J., Swart, P. K. & Frei, Robert, 2022, In: Science of the Total Environment. 806, 2, 17 p., 150565.

Research output: Contribution to journal › Journal article › Research › peer-review

Constraining a bioavailable strontium isotope baseline for the Lake Garda region, Northern Italy: A multi-proxy approach

Ladegaard-Pedersen, P., Frei, Robert, Frank, A. B., Saracino, M., Zorzin, R., Martinelli, N., Kaul, F., Kristiansen, K. & Frei, K. M., 2022, In: Journal of Archaeological Science: Reports. 41, 15 p., 103339.

Research output: Contribution to journal › Journal article › Research › peer-review

Early Cambrian highly metalliferous black shale in South China: Cu and Zn isotopes and a short review of other non-traditional stable isotopes

Lehmann, B., Pašava, J., Šebek, O., Andronikov, A., Frei, Robert, Xu, L. & Mao, J., 2022, In: Mineralium Deposita. 57, 7, p. 1167–1187

Research output: Contribution to journal › Journal article › Research › peer-review

Low oxygen seawater and major shifts in the paleoenvironment towards the terminal Ediacaran: Insights from the Portfjeld Formation, North Greenland

Rugen, E. J., Ineson, J. R. & Frei, Robert, 2022, In: Precambrian Research. 379, 19 p., 106781.

Research output: Contribution to journal › Journal article › Research › peer-review

Petrogenesis of the late Archean Pillow Basalts from the Chitradurga greenstone belt, Western Dharwar Craton (southern India)

Rose, R., Mukherjee, R., Frei, Robert, Mondal, S. K. & Lingadevaru, M., 2022, In: Journal of Earth System Science. 131, 2, 26 p., 95.

Research output: Contribution to journal › Journal article › Research › peer-review

Strontium isotope ratios from the Swabo-Franconian Basin (Germany) and a new compilation of marine 87Sr/86Sr signatures for the Upper Sinemurian to Toarcian: global uniformity and driving forces for marine ⁸⁷Sr/⁸⁶Sr

Frederiksen, Jesper Allan, Ullmann, C. V., Frei, Robert & Korte, Christoph, 2022, In: Newsletters on Stratigraphy. 55, 3, p. 311–331

Research output: Contribution to journal › Journal article › Research › peer-review

Goldilocks at the dawn of complex life: mountains might have damaged Ediacaran–Cambrian ecosystems and prompted an early Cambrian greenhouse world

Caxito, F., Lana, C., Frei, Robert, Uhlein, G. J., Sial, A. N., Dantas, E. L., Pinto, A. G., Campos, F. C., Galvão, P., Warren, L. V., Okubo, J. & Ganade, C. E., Dec 2021, In: Scientific Reports. 11, 1, 15 p., 20010.

Research output: Contribution to journal › Journal article › Research › peer-review

The geographic distribution of bioavailable strontium isotopes in Greece – A base for provenance studies in archaeology

Frank, A. B., Frei, Robert, Moutafi, I., Voutsaki, S., Orgeolet, R., Kristiansen, K. & Frei, K. M., 1 Oct 2021, In: Science of the Total Environment. 791, 16 p., 148156.

Research output: Contribution to journal › Journal article › Research › peer-review

Ediacaran banded iron formations and carbonates of the Cachoeirinha Group of NE Brazil: Paleoenvironment and paleoredox conditions

Usma, C. D., Sial, A. N., Ferreira, V. P., Gaucher, C. & Frei, Robert, 1 Aug 2021, In: Journal of South American Earth Sciences. 109, 6 p., 103282.

Research output: Contribution to journal › Journal article › Research › peer-review

Chromium isotope heterogeneity on a modern carbonate platform

Klaebe, R., Swart, P. & Frei, Robert, 1 Jul 2021, In: Chemical Geology. 573, 13 p., 120227.

Research output: Contribution to journal › Journal article › Research › peer-review

Constraining Shallow Seawater Oxygenation for the Yangtze Platform During the Early Cambrian

Frank, A. B., Klaebe, R. M., Xu, L. & Frei, Robert, 1 Jul 2021, In: Paleoceanography and Paleoclimatology. 36, 7, 19 p., e2021PA004282.

Research output: Contribution to journal › Journal article › Research › peer-review

Isotopic range of bioavailable strontium on the Peloponnese peninsula, Greece: A multi-proxy approach

Frank, A. B., Frei, Robert, Triantaphyllou, M., Vassilakis, E., Kristiansen, K. & Frei, K. M., 1 Jun 2021, In: Science of the Total Environment. 774, 15 p., 145181.

Research output: Contribution to journal › Journal article › Research › peer-review

The Piedras de Afilar Formation (Neoproterozoic, Uruguay): Sedimentology and provenance of a key unit for SW-Gondwana paleogeography

Pamoukaghlián, K., Gaucher, C., Poiré, D. G. & Frei, Robert, 1 Jun 2021, In: Journal of South American Earth Sciences. 108, 26 p., 103176.

Research output: Contribution to journal › Journal article › Research › peer-review

Microbially induced chromium isotope fractionation and trace elements behavior in lower Cambrian microbialites from the Jaíba Member, Bambuí Basin, Brazil

Uhlein, G. J., Caxito, F. A., Frei, Robert, Uhlein, A., Sial, A. N. & Dantas, E. L., 1 Mar 2021, In: Geobiology. 19, 2, p. 125-146 22 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Signals of combined chromium–cadmium isotopes in basin waters of the Early Cambrian – Results from the Maoshi and Zhijin sections, Yangtze Platform, South China

Frei, Robert, Xu, L., Frederiksen, Jesper Allan & Lehmann, B., 1 Mar 2021, In: Chemical Geology. 563, 20 p., 120061.

Research output: Contribution to journal › Journal article › Research › peer-review

The Tapes Complex (Nico Pérez Terrane, Uruguay): Constraining the Mesoproterozoic evolution of the Río de la Plata Craton

Gaucher, C., Frei, Robert, Samaniego, L., Will, T. M., Chemale, F., Gargiulo, M. F., Poiré, D. G., Ling, X., Li, X. & Li, Q., 1 Jan 2021, In: Journal of South American Earth Sciences. 105, 102906.

Research output: Contribution to journal › Journal article › Research › peer-review

A transient swing to higher oxygen levels in the atmosphere and oceans at similar to 1.4 Ga

Wei, W., Frei, Robert, Klaebe, R., Tang, D., Wei, G., Li, D., Tian, L., Huang, F. & Ling, H., 2021, In: Precambrian Research. 354, 10 p., 106058.

Research output: Contribution to journal › Journal article › Research › peer-review

Commentary: Strontium Is Released Rapidly From Agricultural Lime–Implications for Provenance and Migration Studies

Frei, Robert, 2021, In: Frontiers in Ecology and Evolution. 9, 4 p., 681896.

Research output: Contribution to journal › Comment/debate › Research › peer-review

Pulsed volcanism and rapid oceanic deoxygenation during Oceanic Anoxic Event 1a

Bauer, K. W., Bottini, C., Frei, Robert, Asael, D., Planavsky, N. J., Francois, R., McKenzie, N. R., Erba, E. & Crowe, S. A., 2021, In: Geology. 49, 12, p. 1452-1456 5 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Serpentinization in the Archean and Early Phanerozoic - Insights from chromium isotope and REY systematics of the Mg-Cr hydroxycarbonate stichtite and associated host serpentinites

Kraemer, D., Frei, Robert, Ernst, D. M., Bau, M. & Melchiorre, E., 2021, In: Chemical Geology. 565, 13 p., 120055.

Research output: Contribution to journal › Journal article › Research › peer-review

Testing Late Bronze Age mobility in southern Sweden in the light of a new multi-proxy strontium isotope baseline of Scania

Ladegaard-pedersen, P., Sabatini, S., Frei, Robert, Kristiansen, K., Frei, K. M. & Bondioli, L. (ed.), 2021, In: PLoS ONE. 16, 4, 35 p., e0250279.

Research output: Contribution to journal › Journal article › Research › peer-review

Ediacaran Doushantuo-type biota discovered in Laurentia

Willman, S., Peel, J. S., Ineson, J. R., Schovsbo, N. H., Rugen, E. J. & Frei, Robert, 1 Dec 2020, In: Communications Biology . 3, 1, 10 p., 647.

Research output: Contribution to journal › Journal article › Research › peer-review

Surface water oxygenation and bioproductivity – A link provided by combined chromium and cadmium isotopes in Early Cambrian metalliferous black shales (Nanhua Basin, South China)

Frei, Robert, Lehmann, B., Xu, L. & Frederiksen, Jesper Allan, 5 Oct 2020, In: Chemical Geology. 552, 16 p., 119785.

Research output: Contribution to journal › Journal article › Research › peer-review

The link between surface water and groundwater-based drinking water – strontium isotope spatial distribution patterns and their relationships to Danish sediments

Frei, Robert, Frei, K. M., Kristiansen, S. M., Jessen, Søren, Schullehner, J. & Hansen, B., 1 Oct 2020, In: Applied Geochemistry. 121, 11 p., 104698.

Research output: Contribution to journal › Journal article › Research › peer-review

Biogeochemical cycle of chromium isotopes at the modern Earth's surface and its applications as a paleo-environment proxy

Wei, W., Klaebe, R., Ling, H., Huang, F. & Frei, Robert, 20 May 2020, In: Chemical Geology. 541, 119570.

Research output: Contribution to journal › Review › Research › peer-review

A strontium isotope baseline of Cyprus. Assessing the use of soil leachates, plants, groundwater and surface water as proxies for the local range of bioavailable strontium isotope composition

Ladegaard-Pedersen, P., Achilleos, M., Dörflinger, G., Frei, Robert, Kristiansen, K. & Frei, K. M., 2020, In: Science of the Total Environment. 708, 134714.

Research output: Contribution to journal › Journal article › Research › peer-review

A strontium isotope pilot study using cremated teeth from the Vollmarshausen cemetery, Hesse, Germany

Taylor, N., Frei, K. M. & Frei, Robert, 2020, In: Journal of Archaeological Science: Reports. 31, 102356.

Research output: Contribution to journal › Journal article › Research › peer-review

Characterisation of the natural attenuation of chromium contamination in the presence of nitrate using isotopic methods: A case study from the Matanza-Riachuelo River basin, Argentina

Ceballos, E., Margalef-Marti, R., Carrey, R., Frei, Robert, Otero, N., Soler, A. & Ayora, C., 2020, In: Science of the Total Environment. 699, 11 p., 134331.

Research output: Contribution to journal › Journal article › Research › peer-review

Chromium Isotope Systematics in Modern and Ancient Microbialites

Bruggmann, S., Rodler, A. S., Klaebe, R. M., Goderis, S. & Frei, Robert, 2020, In: Minerals. 10, 10, 24 p., 928.

Research output: Contribution to journal › Journal article › Research › peer-review

Chromium isotope composition of organic-rich marine sediments and their mineral phases and implications for using black shales as a paleoredox archive

Frank, A. B., Klaebe, R. M., Löhr, S., Xu, L. & Frei, Robert, 2020, In: Geochimica et Cosmochimica Acta. 270, p. 338-359 22 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Enigmatic 1146 +/- 4 Ma old granite in the southeastern rim of the West African craton, now part of the Dahomeyan orogenic belt in Ghana

Kalsbeek, F., Frei, D., Schersten, A., Frei, Robert, Gerdes, A. & Kalvig, P., 2020, In: Journal of African Earth Sciences. 167, 14 p., 103814.

Research output: Contribution to journal › Journal article › Research › peer-review

Evidence for Neoarchean hydrous arc magmatism, the anorthosite-bearing Mayville Intrusion, western Superior Province, Canada

Sotiriou, P., Polat, A., Frei, Robert, Yang, X. & van Vessem, J., 2020, In: Lithos. 362-363, 105482.

Research output: Contribution to journal › Journal article › Research › peer-review

Factors Controlling the Chromium Isotope Compositions in Podiform Chromitites

Economou-Eliopoulos, M., Frei, Robert & Mitsis, I., 2020, In: Minerals. 10, 1, 10.

Research output: Contribution to journal › Journal article › Research › peer-review

Provenance of the Late Ediacaran Rocha Formation, Cuchilla Dionisio Terrane, Uruguay: Tectonic implications on the assembly of Gondwana

Abre, P., Blanco, G., Gaucher, C., Frei, D. & Frei, Robert, 2020, In: Precambrian Research. 342, 105704.

Research output: Contribution to journal › Journal article › Research › peer-review

Shallow retardation of the strontium isotope signal of agricultural liming - implications for isoscapes used in provenance studies

Frei, Robert, Frei, K. M. & Jessen, Søren, 2020, In: Science of the Total Environment. 706, 12 p., 135710.

Research output: Contribution to journal › Journal article › Research › peer-review

Variations of redox conditions in the atmosphere and Yangtze Platform during the Ediacaran-Cambrian transition: Constraints from Cr isotopes and Ce anomalies

Wei, W., Frei, Robert, Gilleaudeau, G. J., Li, D., Wei, G., Huang, F. & Ling, H., 2020, In: Palaeogeography, Palaeoclimatology, Palaeocology. 543, 11 p., 109598.

Research output: Contribution to journal › Journal article › Research › peer-review

East Greenland ice core dust record reveals timing of Greenland ice sheet advance and retreat.

Simonsen, M. F., Baccolo, G., Blunier, Thomas, Borunda, A., Delmonte, B., Frei, Robert, Goldstein, S., Grinsted, Aslak, Kjær, Helle Astrid, Sowers, T., Svensson, Anders, Vinther, Bo Møllesøe, Vladimirova, D., Winckler, G., Winstrup, M. & Vallelonga, P., 3 Oct 2019, In: Nature Communications. 10, 8 p., 4494.

Research output: Contribution to journal › Journal article › Research › peer-review

A back-arc origin for the Neoarchean megacrystic anorthosite-bearing Bird River Sill and the associated greenstone belt, Bird River subprovince, Western Superior Province, Manitoba, Canada

Sotiriou, P., Polat, A., Frei, Robert, Yang, X. M. & van Vessem, J., 2019, In: International Journal of Earth Sciences. 108, 7, p. 2177-2207 31 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Bioavailable ⁸⁷Sr/⁸⁶Sr in European soils: A baseline for provenancing studies

Hoogewerff, J. A., Reimann, C., Ueckermann, E., Frei, R., Frei, K. M., van Aswegen, T., Stirling, C., Reid, M., Clayton, A., Ladenberger, A., Albanese, S., Andersson, M., Baritz, R., Batista, M. J., Bel-Ian, A., Birke, M., Cicchella, D., Demetriades, A., De Vivo, B., De Vos, W. & 74 others, Dinelli, E., Duris, M., Dusza-Dobek, A., Eggen, O. A., Eklund, M., Ernstsen, V., Filzmoser, P., Flight, D. M. A., Forrester, S., Fuchs, M., Fugedi, U., Gilucis, A., Gregorauskiene, V., De Groot, W., Gulan, A., Halamic, J., Haslinger, E., Hayoz, P., Hoffmann, R., Hrvatovic, H., Husnjak, S., Janik, L., Jordan, G., Kaminari, M., Kirby, J., Kivisilla, J., Klos, V., Krone, F., Kwecko, F., Kuti, L., Lima, A., Locutura, J., Lucivjansky, D. P., Mann, A., Mackovych, D., Matschullat, J., McLaughlin, M., Malyuk, B. ,. I., Maquil, R., Meuli, R. G., Mol, G., Negrel, P., Connor, O., Oorts, R. K., Ottesen, R. T., Pasieczna, A., Petersell, W., Ponavic, M., Pramuka, S., Prazeres, C., Rauch, U., Radusinovic, S., Reimann, C., Sadeghi, M., Salpeteur, I., Scanlon, R., Schedl, A., Scheib, A. J., Schoeters, I., Sefcik, P., Sellersjo, E., Skopijak, F., Slaninka, I., Soriano-Disla, J. M., Sorsa, A., Srvkota, R., Stafilov, T., Tarvainen, T., Trendavilov, V., Valera, P., Verougstraete, V., Vidojevic, D., Zissimos, A. & Zomeni, Z., 2019, In: Science of the Total Environment. 672, p. 1033-1044 12 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Chromium isotope cycling in the water column and sediments of the Peruvian continental margin

Bruggmann, S., Scholz, F., Klaebe, R. M., Canfield, D. E. & Frei, Robert, 2019, In: Geochimica et Cosmochimica Acta. 257, p. 224-242 23 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Fractionation Behavior of Chromium Isotopes during the Sorption of Cr (VI) on Kaolin and its Implications for Using Black Shales as a Paleoredox Archive

Frank, A. B., Klaebe, R. M. & Frei, Robert, 2019, In: Geochemistry Geophysics Geosystems. 20, 5, p. 2290-2302 13 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Heterogeneity and incorporation of chromium isotopes in recent marine molluscs (Mytilus)

Bruggmann, S., Klaebe, R. M., Paulukat, C. & Frei, Robert, 2019, In: Geobiology. 17, 4, p. 417-435 19 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Late Paleoproterozoic and Mesoproterozoic magmatism of the Nico Perez Terrane (Uruguay): Tightening up correlations in southwestern Gondwana

Oriolo, S., Oyhantçabal, P., Konopásek, J., Basei, M. A. S., Frei, Robert, Sláma, J., Wemmer, K. & Siegesmund, S., 2019, In: Precambrian Research. 327, p. 296-313 18 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Mapping human mobility during the third and second millennia BC in present-day Denmark

Frei, K. M., Bergerbrant, S., Sjögren, K., Jørkov, M L S, Lynnerup, Niels, Harvig, L., Allentoft, Morten Erik, Sikora, Martin, Price, T. D., Frei, Robert & Kristiansen, K., 2019, In: PLoS ONE. 14, 8, e0219850.

Research output: Contribution to journal › Journal article › Research › peer-review

Mobilization and isotope fractionation of chromium during water-rock interaction in presence of siderophores

Kraemer, D., Frei, Robert, Viehmann, S. & Bau, M., 2019, In: Applied Geochemistry. 102, p. 44-54 11 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Multi-isotope proveniencing of human remains from a Bronze Age battlefield in the Tollense Valley in northeast Germany

Price, T. D., Frei, Robert, Brinker, U., Lidke, G., Terberger, T., Frei, K. M. & Jantzen, D., 2019, In: Archaeological and Anthropological Sciences. 11, 1, p. 33-49 17 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Petrogenesis and geodynamic setting of the Neoarchaean Haines Gabbroic Complex and Shebandowan greenstone belt, southwestern Superior Province, Ontario, Canada

Sotiriou, P., Polat, A. & Frei, Robert, 2019, In: Lithos. 324-325, p. 1-19 20 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Redox fluctuations during the Ediacaran-Cambrian transition, Nanhua Basin, South China: Insights from Cr isotope and REE+Y data

Frank, A. B., Klaebe, R. M., Xu, L. & Frei, Robert, 2019, In: Chemical Geology. 525, p. 321-333 13 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Subtle Cr isotope signals track the variably anoxic Cryogenian interglacial period with voluminous manganese accumulation and decrease in biodiversity

Xu, L., Frank, A. B., Lehmann, B., Zhu, J., Mao, J., Ju, Y. & Frei, Robert, 2019, In: Scientific Reports. 9

Research output: Contribution to journal › Journal article › Research › peer-review

The role of pH on Cr(VI) partitioning and isotopic fractionation during its incorporation in calcite

Füger, A., Bruggmann, S., Frei, Robert, Leis, A., Dietzel, M. & Mavromatis, V., 2019, In: Geochimica et Cosmochimica Acta. 265, p. 520-532 13 p.

Research output: Contribution to journal › Journal article › Research › peer-review

An overview of anorthosite-bearing layered intrusions in the Archaean craton of southern West Greenland and the Superior Province of Canada: implications for Archaean tectonics and the origin of megacrystic plagioclase

Polat, A., Longstaffe, F. J. & Frei, Robert, 1 Jan 2018, In: Geodinamica Acta. 30, 1, p. 84-99 16 p.

Research output: Contribution to journal › Review › Research › peer-review

A systematic look at chromium isotopes in modern shells - implications for paleo-environmental reconstructions

Frei, Robert, Paulukat, C., Bruggmann, S. & Klaebe, R. M., 2018, In: Biogeosciences. 15, 16, p. 4905-4922 18 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Carbon stable isotope record in the coral species Siderastrea stellata: A link to the Suess Effect in the tropical South Atlantic Ocean

Pereira, N. S., Sial, A. N., Kilbourne, K. H., Liu, S., Shen, C. -., Ullmann, C. V., Frei, Robert, Korte, Christoph, Kikuchi, R. K. P., Ferreira, V. P. & Braga, B. L. S. S., 2018, In: Palaeogeography, Palaeoclimatology, Palaeoecology - An International Journal for the Geo-Sciences. 497, p. 82-90 9 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Chromium isotope fractionation between modern seawater and biogenic carbonates from the Great Barrier Reef, Australia: Implications for the paleo-seawater delta δ⁵³ reconstruction

Farkas, J., Fryda, J., Paulukat, C., Hathorne, E. C., Matouskova, S., Rohovec, J., Frydova, B., Francova, M. & Frei, Robert, 2018, In: Earth and Planetary Science Letters. 498, p. 140-151 12 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Diet and mobility among Mesolithic hunter-gatherers in Motala (Sweden) - The isotope perspective

Eriksson, G., Frei, K. M., Howcroft, R., Gummesson, S., Molin, F., Liden, K., Frei, Robert & Hallgren, F., 2018, In: Journal of Archaeological Science: Reports. 17, p. 904-918 15 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Environmentally available hexavalent chromium in soils and sediments impacted by dispersed fly ash in Sarigkiol basin (Northern Greece)

Kazakis, N., Kantiranis, N., Kalaitzidou, K., Kaprara, E., Mitrakas, M., Frei, Robert, Vargemezis, G., Vogiatzis, D., Zouboulis, A. & Filippidis, A., 2018, In: Environmental Pollution. 235, p. 632-641 10 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Fedtsten - Godthåbsfjordens skjulte ressource

Poulsen, Majken Djurhuus, Knudsen, R. J., Keulen, N., Thorsøe, K. & Frei, Robert, 2018, In: Tidsskriftet Grønland. 4, 16 p.

Research output: Contribution to journal › Journal article › Communication

Highly fractionated chromium isotopes in Mesoproterozoic-aged shales and atmospheric oxygen

Canfield, D. E., Zhang, S., Frank, A. B., Wang, X., Wang, H., Su, J., Ye, Y. & Frei, Robert, 2018, In: Nature Communications. 9, 11 p., 2871.

Research output: Contribution to journal › Journal article › Research › peer-review

Marine ferromanganese oxide: A potentially important sink of light chromium isotopes?

Wei, W., Frei, Robert, Chen, T., Klaebe, R., Liu, H., Li, D., Wei, G. & Ling, H., 2018, In: Chemical Geology. 495, p. 90-103 14 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Multiproxy geochemical and isotope stratigraphy records of a Neoproterozoic Oxygenation Event in the Ediacaran Sete Lagoas cap carbonate, Bambui Group, Brazil

Caxito, F. A., Frei, Robert, Uhlein, G. J., Dias, T. G., Árting, T. B. & Uhlein, A., 2018, In: Chemical Geology. 481, p. 119-132 14 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Oxygenation variations in the atmosphere and shallow seawaters of the Yangtze Platform during the Ediacaran Period: Clues from Cr-isotope and Ce-anomaly in carbonates

Wei, W., Frei, Robert, Gilleaudeau, G. J., Li, D., Wei, G., Chen, X. & Ling, H., 2018, In: Precambrian Research. 313, p. 78-90 13 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Pervasive early diagenetic dolomitization, subsequent hydrothermal alteration, and late stage hydrocarbon accumulation in a Middle Triassic carbonate sequence (Szeged Basin, SE Hungary)

Garaguly, I., Varga, A., Raucsik, B., Schubert, F., Czuppon, G. & Frei, Robert, 2018, In: Marine and Petroleum Geology. 98, p. 270-290 21 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Petrogenetic and geodynamic origin of the Neoarchean Doré Lake Complex, Abitibi subprovince, Superior Province, Canada

Polat, A., Frei, Robert, Longstaffe, F. J. & Woods, R., 2018, In: International Journal of Earth Sciences. 107, 3, p. 811-843 33 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Petrology and geochemistry of the Tasse mantle xenoliths of the Canadian Cordillera: A record of Archean to Quaternary mantle growth, metasomatism, removal, and melting

Polat, A., Frei, Robert, Longstaffe, F. J., Thorkelson, D. J. & Friedman, E., 2018, In: Tectonophysics. 737, p. 1-26 26 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Redox condition in the Nanhua Basin during the waning of the Sturtian glaciation: A chromium-isotope perspective

Wei, W., Frei, Robert, Klaebe, R., Li, D., Wei, G. & Ling, H., 2018, In: Precambrian Research. 319, p. 198-210 13 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Stable isotope records across the Cretaceous-Paleogene transition, Stevns Klint, Denmark: New insights from the chromium isotope system

Gilleaudeau, G. J., Vögelin, A. R., Thibault, Nicolas Rudolph, Moreau, J., Ullmann, C. V., Klaebe, R. M., Korte, Christoph & Frei, Robert, 2018, In: Geochimica et Cosmochimica Acta. 235, p. 305-332 28 p.

Research output: Contribution to journal › Journal article › Research › peer-review

The geochemistry of modern calcareous barnacle shells and applications for palaeoenvironmental studies

Ullmann, C. V., Gale, A. S., Haggett, J., Wray, D., Frei, Robert, Korte, Christoph, Broom-Fendley, S., Littler, K. & Hesselbo, S. P., 2018, In: Geochimica et Cosmochimica Acta. 243, p. 149-168 20 p.

Research output: Contribution to journal › Journal article › Research › peer-review

A matter of months: high precision migration chronology of a Bronze Age female

Frei, K. M., Villa, Chiara, Jørkov, M L S, Allentoft, Morten Erik, Kaul, F., Ethelberg, P., Reiter, S. S., Wilson, A. S., Taube, M., Olsen, J., Lynnerup, Niels, Willerslev, Eske, Kristiansen, K. & Frei, Robert, 5 Jun 2017, In: PLoS ONE. 12, 6, 20 p., e0178834.

Research output: Contribution to journal › Journal article › Research › peer-review

Barnacles – recorders of environmental conditions with unique geochemical signatures

Ullmann, C. V., Gale, A., Korte, Christoph, Frei, Robert, Huggett, J. & Wray, D., 2017, In: Geophysical Research Abstracts. 19, 6134.

Research output: Contribution to journal › Conference abstract in journal › Research › peer-review

Element/Ca, C and O isotope ratios in modern brachiopods: Species-specific signals of biomineralization

Ullmann, C. V., Frei, Robert, Korte, Christoph & Lüter, C., 2017, In: Chemical Geology. 460, p. 15-24 10 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Extensive oxidative weathering in the aftermath of a late Neoproterozoic glaciation - Evidence from trace element and chromium isotope records in the Urucum district (Jacadigo Group) and Puga iron formations (Mato Grosso do Sul, Brazil)

Frei, Robert, Døssing, L. N., Gaucher, C., Boggiani, P. C., Frei, K. M., Árting, T. B., Crowe, S. A. & Freitas, B. T., 2017, In: Gondwana Research. 49, p. 1-20 20 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Geochemical constraints on the sources of Cr(VI) contamination in waters of Messapia (Central Evia) Basin

Economou-Eliopoulos, M., Megremi, I., Vasilatos, C., Frei, Robert & Mpourodimos, I., 2017, In: Applied Geochemistry. 84, p. 13-25 13 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Multiproxy isotope constraints on ocean compositional changes across the late Neoproterozoic Ghaub glaciation, Otavi Group, Namibia

Rodler, A., Frei, Robert, Gaucher, C., Korte, Christoph, Rosing, Salik Anders & Germs, G. J. B., 2017, In: Precambrian Research. 298, p. 306-324 19 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Origin of hexavalent chromium in groundwater: the example of Sarigkiol Basin, Northern Greece

Kazakis, N., Kantiranis, N., Kalaitzidou, K., Kaprara, M., Mitrakas, M., Frei, Robert, Vargemezis, G., Tsourlos, P., Zouboulis, A. & Filippidis, A., 2017, In: Science of the Total Environment. 593-594, p. 552-566 15 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Origins of inhabitants from the 16th century Sala (Sweden) silver mine cemetery – a lead isotope perspective

Price, T. D., Frei, Robert, Bäckström, Y., Frei, K. M. & Ingvarsson-Sundstrom, A., 2017, In: Journal of Archaeological Science. 80, p. 1-13 13 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Redox fluctuations in the Early Ordovician oceans: an insight from chromium stable isotopes

D'Arcy, J. M., Gilleaudeau, G. J., Peralta, S., Gaucher, C. & Frei, Robert, 2017, In: Chemical Geology. 448, p. 1-12 12 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Reply to comments by Sanjay K. Mukhopadhyay, Sucharita Pal, J. P. Shrivastava on the paper by Sial et al. (2016) Mercury enrichments and Hg isotopes in Cretaceous-Paleogene boundary successions: Links to volcanism and palaeoenvironmental impacts. Cretaceous Research 66, 60-81

Sial, A. N., Chen, J., Lacerda, L. D., Frei, Robert, Tewari, V. C., Pandit, M. K., Gaucher, C., Ferreira, V. P., Cirilli, S., Peralta, S., Korte, Christoph, Barbosa, J. A. & Pereira, N. S., 2017, In: Cretaceous Research. 76, p. 84-88 5 p.

Research output: Contribution to journal › Comment/debate › Research › peer-review

The potential of the coral species Porites astreoides as a paleoclimate archive for the Tropical South Atlantic Ocean

Pereira, N. S., Sial, A. N., Frei, Robert, Ullmann, C. V., Korte, Christoph, Kikuchi, R. K. P., Ferreira, V. P. & Kilbourne, K. H., 2017, In: Journal of South American Earth Sciences. 77, p. 276-285 10 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Trace elements and isotope geochemistry (C, O, Fe, Cr) of the Cauê iron formation, Quadrilátero Ferrífero, Brazil: Evidence for widespread microbial dissimilatory iron reduction at the Archean/Paleoproterozoic transition

Teixeira, N. L., Caxito, F. A., Rosière, C. A., Pecoits, E., Vieira, L., Frei, Robert, Sial, A. N. & Poitrasson, F., 2017, In: Precambrian Research. 298, p. 39-55 17 p.

Research output: Contribution to journal › Journal article › Research › peer-review

U-Pb age constraints for the La Tuna Granite and Montevideo Formation (Paleoproterozoic, Uruguay): Unravelling the structure of the Rio de la Plata Craton

Pamoukaghlian, K., Gaucher, C., Frei, Robert, Poire, D. G., Chemale, F., Frei, D. & Will, T. M., 2017, In: Journal of South American Earth Sciences. 79, p. 443-458 16 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Mercury enrichment and Hg isotopes in Cretaceous-Paleogene boundary successions: Links to volcanism and palaeoenvironmental impacts

Sial, A. N., Chen, J., Lacerda, L. D., Frei, Robert, Tewari, V. C., Pandit, M. K., Gaucher, C., Ferreira, V. P., Cirilli, S., Peralta, S., Korte, Christoph, Barbosa, J. A. & Pereira, N. S., Nov 2016, In: Cretaceous Research. 66, p. 60-81

Research output: Contribution to journal › Journal article › Research › peer-review

Chromium isotope stratigraphy of Ediacaran cap dolostones, Doushantuo Formation, South China

Rodler, A., Hohl, S. V., Guo, Q. & Frei, Robert, 15 Oct 2016, In: Chemical Geology. 436, p. 24-34

Research output: Contribution to journal › Journal article › Research › peer-review

Oxygen and carbon isotope and Sr/Ca signatures of high-latitude Permian to Jurassic calcite fossils from New Zealand and New Caledonia

Ullmann, C. V., Campbell, H. J., Frei, Robert & Korte, Christoph, 1 Oct 2016, In: Gondwana Research. 38, p. 60-73

Research output: Contribution to journal › Journal article › Research › peer-review

Geochemistry, Nd, Pb and Sr isotope systematics, and U-Pb zircon ages of the Neoarchean Bad Vermilion Lake greenstone belt and spatially associated granitic rocks, western Superior Province, Canada

Wu, T., Polat, A., Frei, Robert, Fryer, B. J., Yang, K. & Kusky, T., Sep 2016, In: Precambrian Research. 282, p. 21-51

Research output: Contribution to journal › Journal article › Research › peer-review

Generation of continental crust in the northern part of the Borborema Province, northeastern Brazil, from Archaean to Neoproterozoic

de Souza, Z. S., Kalsbeek, F., Deng, X., Frei, Robert, Kokfelt, T. F., Dantas, E. L., Li, J., Pimentel, M. M. & Galindo, A. C., Jul 2016, In: Journal of South American Earth Sciences. 68, p. 68-96

Research output: Contribution to journal › Journal article › Research › peer-review

Lithospheric mantle xenoliths sampled by melts from upwelling asthenosphere: The Quaternary Tasse alkaline basalts of southeastern British Columbia, Canada

Friedman, E., Polat, A., Thorkelson, D. J. & Frei, Robert, May 2016, In: Gondwana Research. 33, p. 209-230

Research output: Contribution to journal › Journal article › Research › peer-review

Potential leaching of Cr(VI) from laterite mines and residues of metallurgical products (red mud and slag): an integrated approach

Economou-Eliopoulos, M., Frei, Robert & Megremi, I., Mar 2016, In: Journal of Geochemical Exploration. 162, p. 40-49 10 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Oxidative elemental cycling under the low O₂ Eoarchean atmosphere

Frei, Robert, Crowe, S. A., Bau, M., Polat, A., Fowle, D. A. & Døssing, L. N., 11 Feb 2016, In: Scientific Reports. 6, 21058.

Research output: Contribution to journal › Journal article › Research › peer-review

Imperial Porphyry from Gebel Abu Dokhan, the Red Sea Mountains, Egypt: Part H. Geochemistry

Makovicky, Emil, Frei, Robert, Bailey, John C & Karup-Moller, S., Jan 2016, In: Neues Jahrbuch für Mineralogie - Abhandlungen / Journal of Mineralogy and Geochemistry. 193, 1, p. 29-44

Research output: Contribution to journal › Journal article › Research › peer-review

Chromium isotope, REE and redox-sensitive trace element chemostratigraphy across the late Neoproterozoic Ghaub glaciation, Otavi Group, Namibia

Rodler, A., Frei, Robert, Gaucher, C. & Germs, G. J. B., 2016, In: Precambrian Research. 286, p. 234-249 16 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Chromium-isotope signatures in scleractinian corals from the Rocas Atoll, Tropical South Atlantic

Pereira, N. S., Vögelin, A. R., Paulukat, C. S., Sial, A. N., Ferreira, V. P. & Frei, Robert, 2016, In: Geobiology. 14, 1, p. 54–67 12 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Early Cambrian Black Shale-Hosted Mo-Ni and V Mineralization on the Rifted Margin of the Yangtze Platform, China: Reconnaissance Chromium Isotope Data and a Refined Metallogenic Model

Lehmann, B., Frei, Robert, Xu, L. & Mao, J., 2016, In: Economic Geology . 111, 1, p. 89-103

Research output: Contribution to journal › Journal article › Research › peer-review

Imperial porphyry from Gebel Abu Dokhan, the Red Sea Mountains, Egypt Part I. mineralogy, petrology and occurrence

Makovicky, Emil, Frei, Robert, Karup-Moller, S. & Bailey, John C, 2016, In: Neues Jahrbuch fur Mineralogie, Abhandlungen. 193, 1, p. 1-27 27 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Onset of main Phanerozoic marine radiation sparked by emerging Mid Ordovician icehouse

Rasmussen, Christian Mac Ørum, Ullmann, C. V., Jakobsen, K. G., Lindskog, A., Hansen, J., Hansen, T., Eriksson, M. E., Dronov, A., Frei, Robert, Korte, Christoph, Nielsen, Arne Thorshøj & Harper, D. A. T., 2016, In: Scientific Reports. 6, 9 p., 18884.

Research output: Contribution to journal › Journal article › Research › peer-review

Oxygenation of the mid-Proterozoic atmosphere: clues from chromium isotopes in carbonates

Gilleaudeau, G. J., Frei, Robert, Kaufman, A. J., Kah, L. C., Azmy, K., Bartley, J. K., Chernyavskiy, P. & Knoll, A. H., 2016, In: Geochemical Perspectives. 2, 2, p. 178-186 9 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Processes controlling the chromium isotopic composition of river water: constraints from basaltic river catchments

D'Arcy, J. M., Babechuk, M. G., Døssing, L. N., Gaucher, C. & Frei, Robert, 2016, In: Geochimica et Cosmochimica Acta. Supplement. 186, p. 296-315 20 p.

Research output: Contribution to journal › Journal article › Research › peer-review

The Cr-isotope signature of surface seawater - a global perspective

Paulukat, C. S., Gilleaudeau, G. J., Chernyavskiy, P. & Frei, Robert, 2016, In: Chemical Geology. 444, p. 101-109 9 p.

Research output: Contribution to journal › Journal article › Research › peer-review

The Pan-African West Congo belt in the Republic of Congo (Congo Brazzaville): stratigraphy of the Mayombe and West Congo supergroups studied by detrital zircon geochronology

Affaton, P., Kalsbeek, F., Boudzoumou, F., Trompette, R., Thrane, K. & Frei, Robert, 2016, In: Precambrian Research. 272, p. 185-202 18 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Chemical and isotopic architecture of the belemnite rostrum

Ullmann, C. V., Frei, Robert, Korte, Christoph & Hesselbo, S. P., 5 Jun 2015, In: Geochimica et Cosmochimica Acta. 159, p. 231-243 13 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Was it for walrus? Viking Age settlement and medieval walrus ivory trade in Iceland and Greenland

Frei, K. M., Coutu, A. N., Smiarowski, K., Harrison, R., Madsen, C. K., Arneborg, J., Frei, Robert, Gudmundsson, G., Sindbaek, S. M., Woollett, J., Hartman, S., Hicks, M. & McGovern, T. H., 27 May 2015, In: World Archaeology. 47, 3, p. 439-466

Research output: Contribution to journal › Journal article › Research › peer-review

Algoma-type Neoproterozoic BIFs and related marbles in the Seridó Belt (NE Brazil): REE, C, O, Cr and Sr isotope evidence

Sial, A. N., Campos, M. S., Gaucher, C., Frei, Robert, Ferreira, V. P., Nascimento, R. C., Nascimento, R. C., Pereira, N. S. & Rodler, A., 2015, In: Journal of South American Earth Sciences. 61, p. 33-52 20 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Coral-based climate records from tropical South Atlantic: 2009/2010 ENSO event in C and O isotopes from Porites corals (Rocas Atoll, Brazil)

Pereira, N. S., Sial, A. N., Kikuchi, R. K. P., Ferreira, V. P., Ullmann, C. V., Frei, Robert & Cunha, A. M. C., 2015, In: Anais da Academia Brasileira de Ciencias.. 87, 4, p. 1939-1957 19 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Fractionation behavior of chromium isotopes during coprecipitation with calcium carbonate: implications for their use as paleoclimatic proxy

Rodler, A., Sánchez-Pastor, N., Fernández-Díaz, L. & Frei, Robert, 2015, In: Geochimica et Cosmochimica Acta. 164, p. 221-235 15 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Oxidative release of chromium from Archean ultramafic rocks, its transport and environmental impact – A Cr isotope perspective on the Sukinda valley ore district (Orissa, India)

Paulukat, C. S., Døssing, L. N., Mondal, S. K., Vögelin, A. R. & Frei, Robert, 2015, In: Applied Geochemistry. 59, p. 125-138

Research output: Contribution to journal › Journal article › Research › peer-review

Subaerial speleothems and deep karst in central Sweden linked to Hirnantian glaciations

Kröger, B., Ebbestad, J. O. R., Lehnert, O., Ullmann, C. V., Korte, Christoph, Frei, Robert & Rasmussen, Christian Mac Ørum, 2015, In: Journal of the Geological Society - London. 172, 3, p. 349-356 8 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Tracing the dynamic life story of a Bronze Age Female

Frei, Karin Margarita, Mannering, U., Kristiansen, K., Allentoft, Morten Erik, Wilson, A. S., Skals, I., Tridico, S., Nosch, Marie Louise Bech, Willerslev, Eske, Clarke, L. & Frei, Robert, 2015, In: Scientific Reports. 10431.

Research output: Contribution to journal › Journal article › Research › peer-review

Application of chromium stable isotopes to the evaluation of Cr(VI) contamination in groundwater and rock leachates from central Euboea and the Assopos basin (Greece)

Economou-Eliopoulos, M., Frei, Robert & Atsarou, C., Nov 2014, In: CATENA. 122, p. 216-228 13 p.

Research output: Contribution to journal › Journal article › Research › peer-review

High-resolution Hg Chemostratigraphy: A contribution to the distinction of chemical fingerprints of the Deccan volcan ism and Cretaceous−Paleogene Boundary impact event

Sial, A. N., Chen, J., Lacerda, L. D., Peralta, S., Gaucher, C., Frei, Robert, Cirilli, S., Ferreira, V. P., Marquillas, R. A., Barbosa, J. A., Pereira, N. S. & Belmino, I. K. C., Nov 2014, In: Palaeogeography, Palaeoclimatology, Palaeoecology - An International Journal for the Geo-Sciences. 414, p. 98-115 17 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Geochemical signatures in Late Triassic brachiopods from New Caledonia

Ullmann, C. V., Campbell, H. J., Frei, Robert & Korte, Christoph, Oct 2014, In: New Zealand Journal of Geology and Geophysics. 57, 4, p. 420-431 12 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Weathering on land and transport of chromium to the ocean in a subtropical region (Misiones, NW Argentina): A chromium stable isotope perspective

Frei, Robert, Poiré, D. G. & Frei, Karin Margarita, Aug 2014, In: Chemical Geology. 381, p. 110-124 15 p.

Research output: Contribution to journal › Journal article › Research › peer-review

⁴⁰Ar/³⁹Ar dating of exceptional concentration of metals by weathering of Precambrian rocks at the Precambrian–Cambrian boundary

Parnell, J., Mark, D. F., Frei, Robert, Fallick, A. E. & Ellam, R. M., Jun 2014, In: Precambrian Research. 246, p. 54-63 10 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Rare earth element mineralogy and geochemistry in a laterite profile from Madagascar

Berger, A., Janots, E., Gnos, E., Frei, Robert & Bernier, F., Feb 2014, In: Applied Geochemistry. 41, p. 218-228 11 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Constraints on the origin and evolution of magmas in the Payún Matrú Volcanic Field, Quaternary Andean back-arc of western Argentina

Hernadno, I. R., Aragón, E., Frei, Robert, Gonzáles, P. D. & Spakman, W., Jan 2014, In: Journal of Petrology. 55, 1, p. 209-239 31 p.

Research output: Contribution to journal › Journal article › Research › peer-review

The fate of chromium during tropical weathering: A laterite profile from Central Madagascar

Berger, A. & Frei, Robert, Jan 2014, In: Geoderma. 213, p. 521-532 12 p.

Research output: Contribution to journal › Journal article › Research › peer-review

The Neoarchaean Storø Supracrustal Belt, Nuuk region, southern West Greenland: An arc-related basin with continent-derived sedimentation

Szilas, Kristoffer, van Gool, J. A. M., Scherstén, A. & Frei, Robert, 2014, In: Precambrian Research. 247, p. 208–222 15 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Remnants of arc-related Mesoarchaean oceanic crust in the Tartoq Group of SW Greenland

Szilas, Kristoffer, van Hinsberg, V. J., Kisters, A. F. M., Hoffmann, J. E., Windley, B. F., Kokfelt, T. F., Scherstén, A., Frei, Robert, Rosing, Minik Thorleif & Münker, C., Mar 2013, In: Gondwana Research. 23, 2, p. 436-451 16 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Atmospheric oxygenation three billion years ago

Crowe, S., Døssing, L. N., Beukes, N. J., Bau, M., Kruger, S. J., Frei, Robert & Canfield, D. E., 2013, In: Nature. 501, 7468, p. 535-538 4 p.

Research output: Contribution to journal › Letter › Research › peer-review

Chromium isotope fractionation during oxidative weathering - implications from the study of a Paleoproterozoic (ca. 1.9 Ga) paleosol, Schreiber Beach, Ontario, Canada

Frei, Robert & Polat, A., 2013, In: Precambrian Research. 224, p. 434-453 20 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Chromium isotope record of the Otavi Group, Namibia

Rodler, A., Frei, Robert, Gaucher, C., Vögelin, A. R., Ullmann, C. V. & Korte, Christoph, 2013, In: Mineralogical Magazine. 77, 5, p. 2075 1 p.

Research output: Contribution to journal › Conference abstract in journal › Research

Comment on: “Chemostratigraphic constraints on early Ediacaran carbonate rampdynamics, Río de la Plata craton, Uruguay” by Aubet et al. Gondwana Research, Volume 22, Issues 3-4, November 2012, Pages 1073-1090

Gaucher, C., Sial, A. N., Frei, Robert, Sprechmann, P., Bossi, J., Poiré, D. G., Blanco, G. & Sánchez Bettucci, L., 2013, In: Gondwana Research. 23, 3, p. 1183-1185 3 p.

Research output: Contribution to journal › Comment/debate › Research

Dating brittle tectonic movements with cleft monazite: fluid-rock interaction and formation of REE minerals

Berger, A., Gnos, E., Janots, E., Whitehouse, M., Soom, M., Frei, Robert & Waight, Tod, 2013, In: Tectonics. 32, 5, p. 1176–1189 14 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Fluctuations in late Neoproterozoic atmospheric oxidation — Cr isotope chemostratigraphy and iron speciation of the late Ediacaran lower Arroyo del Soldado Group (Uruguay)

Frei, Robert, Gaucher, C., Stolper, D. & Canfield, D. E., 2013, In: Gondwana Research. 23, 2, p. 797-811 15 p.

Research output: Contribution to journal › Journal article › Research › peer-review

High-resolution stable isotope stratigraphy of the upper Cambrian and Ordovician in the Argentine Precordillera: carbon isotope excursions and correlations

Sial, A. N., Peralta, S., Gaucher, C., Toselli, A. J., Ferreira, V. P., Frei, Robert, Parada, M. A., Pimentel, M. M. & Pereira, N. S., 2013, In: Gondwana Research. 24, 1, p. 330-348 19 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Large Igneous Province volcanism, ocean anoxia and marine mass extinction

Ruhl, M., Bjerrum, Christian J., Canfield, D., Korte, Christoph, Stemmerik, L. & Frei, Robert, 2013, In: Mineralogical Magazine. 77, 5, p. 2097 1 p.

Research output: Contribution to journal › Conference abstract in journal › Research

Mercury as a proxy for volcanic activity during extreme environmental turnover: The Cretaceous-Paleogene transition

Sial, A. N., Lacerda, L. D., Ferreira, V. P., Frei, Robert, Marquillas, R. A., Barbosa, J. A., Gaucher, C., Windmöller, C. C. & Pereira, N. S., 2013, In: Palaeogeography, Palaeoclimatology, Palaeoecology - An International Journal for the Geo-Sciences. 387, p. 153-164 12 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Ocean anoxia and large igneous provinces

Ruhl, M., Bjerrum, Christian J., Canfield, D. E., Korte, Christoph, Stemmerik, L. & Frei, Robert, 2013, In: Geophysical Research Abstracts. 15, 1 p.

Research output: Contribution to journal › Conference abstract in journal › Research

Partial diagenetic overprint of late jurassic belemnites from New Zealand: implications for the preservation potential of δ⁷Li values in calcite fossils

Ullmann, C. V., Campbell, H. J., Frei, Robert, Hesselbo, S. P., Pogge von Strandmann, P. A. E. & Korte, Christoph, 2013, In: Geochimica et Cosmochimica Acta. 120, p. 80-96 17 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Petrology and geochemistry of the ~2.9 Ga Itilliarsuk banded iron formation and associated supracrustal rocks, West Greenland: source characteristics and depositional environment

Haugaard, R., Frei, Robert, Stendal, H. & Konhauser, K., 2013, In: Precambrian Research. 229, p. 150-176 27 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Preservation potential of δ7Li values in Mesozoic calcite fossils

Ullmann, C. V., Campbell, H. J., Frei, Robert, Hesselbo, S. P., Pogge von Strandmann, P. A. E. & Korte, Christoph, 2013, In: Mineralogical Magazine. 77, 5, p. 2376

Research output: Contribution to journal › Conference abstract in journal › Research › peer-review

The geographic distribution of Sr isotopes from surface waters and soil extracts over the island of Bornholm (Denmark) – A base for provenance studies in archaeology and agriculture

Frei, Robert & Frei, Karin Margarita, 2013, In: Applied Geochemistry. 38, p. 147-160 14 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Complex calc-alkaline volcanism recorded in Mesoarchaean supracrustal belts north of Frederikshåb Isblink, southern West Greenland: implications for subduction zone processes in the early earth

Szilas, Kristoffer, Hoffmann, J. E., Scherstén, A., Rosing, Minik Thorleif, Windley, B. F., Kokfelt, T. F., Keulen, N., van Hinsberg, V. J., Næraa, T., Frei, Robert & Münker, C., 2012, In: Precambrian Research. 208-211, p. 90-123 34 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Extreme element mobility during transformation of Neoarchean (ca. 2.7 Ga) pillow basalts to a Paleoproterozoic (ca. 1.9 Ga) paleosol, Schreiber Beach, Ontario, Canada

Polat, A., Longstaffe, F., Weisener, C., Fryer, B., Frei, Robert & Kerrich, R., 2012, In: Chemical Geology. 326-327, p. 145-173 29 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Geochemistry of ultramafic rocks and hornblendite veins in the Fiskenæsset layered anorthosite complex, SW Greenland: evidence for hydrous upper mantle in the Archean

Polat, A., Fryer, B. J., Samson, I. M., Weisener, C., Appel, P. W. U., Frei, Robert & Windley, B. F., 2012, In: Precambrian Research. 214-215, p. 124-153 30 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Geochronology of granitoid and metasedimentary rocks from Togo and Benin, West Africa: comparisons with NE Brazil

Kalsbeek, F., Affaton, P., Ekwueme, B., Frei, Robert & Thrane, K., 2012, In: Precambrian Research. 196-197, p. 218-233 16 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Isotopic studies of human skeletal remains from a sixteenth to seventeenth century AD churchyard in Campeche, Mexico: diet, place of origin, and age

Price, T. D., Burton, J. H., Cucina, A., Zabala, P., Frei, Robert, Tykot, R. H. & Tiesler, V., 2012, In: Current Anthropology. 53, 4, p. 396-433

Research output: Contribution to journal › Journal article › Research › peer-review

Origin of Mesoarchaean arc-related rocks with boninite/komatiite affinities from southern West Greenland

Szilas, Kristoffer, Næraa, T., Scherstén, A., Stendal, H., Frei, Robert, van Hinsberg, V. J., Kokfelt, T. F. & Rosing, Minik Thorleif, 2012, In: Lithos. 144-145, p. 24-39 16 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Paleo- and Neoproterozoic magmatic and tectonometamorphic evolution of the Isla Cristalina de Rivera (Nico Pérez Terrane, Uruguay)

Oyhantçabal, P., Wagner-Eimer, M., Wemmer, K., Schulz, B., Frei, Robert & Siegesmund, S., 2012, In: International Journal of Earth Sciences. 101, 7, p. 1745-1762 18 p.

Research output: Contribution to journal › Journal article › Research › peer-review

The 3.1 Ga Nuggihalli chromite deposits, Western Dhawar craton (India): geochemical and isotopic constraints on mantle sources, crustal evolution and implications for supercontinent formation and ore mineralization

Mukherjee, R., Mondal, S. K., Frei, Robert, Rosing, Minik Thorleif, Waight, Tod, Zhong, H. & Kumar, G. R. R., 2012, In: Lithos. 155, p. 392-409 18 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Chromium isotopes in carbonates — A tracer for climate change and for reconstructing the redox state of ancient seawater

Frei, Robert, Gaucher, C., Døssing, L. N. & Sial, A. N., 30 Oct 2011, In: Earth and Planetary Science Letters. 312, p. 114–125 12 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Different degrees of partial melting of the enriched mantle source for Plio-Quaternary basic volcanism, Toprakkale (Osmaniye) Region, Southern Turkey

Bagci, U., Alpaslan, M., Frei, Robert, Kurt, M. A. & Temel, A., Mar 2011, In: Turkish Journal of Earth Sciences. 20, 1, p. 115-135 21 p.

Research output: Contribution to journal › Journal article › Research › peer-review

The geographic distribution of strontium isotopes in Danish surface waters - A base for provenance studies in archaeology, hydrology and agriculture

Frei, Karin Margarita & Frei, Robert, Mar 2011, In: Applied Geochemistry. 26, 3, p. 326-340 15 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Cr-isotopes and REE variations in a laterite profile: Implication for redox processes and element mobility during weathering

Berger, A. & Frei, Robert, 2011, In: Mineralogical Magazine. 75, 3, p. 516 1 p.

Research output: Contribution to journal › Conference abstract in journal › Research

Mesoproterozoic evolution of the Rio de la Plata Craton in Uruguay: at the heart of Rodinia?

Gaucher, C., Frei, Robert, Chemale, F., Frei, D., Bossi, G., Martinez, G., Chiglino, L. & Cernuschi, F., 2011, In: International Journal of Earth Sciences. 100, 2-3, p. 273-288 16 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Molybdenum evidence for expansive sulfidic water masses in similar ∼ 750 Ma oceans

Dahl, Tais Wittchen, Canfield, D. E., Rosing, Minik Thorleif, Frei, Robert, Gordon, G. W., Knoll, A. H. & Anbar, A. D., 2011, In: Earth and Planetary Science Letters. 311, 3-4, p. 264-274

Research output: Contribution to journal › Journal article › Research › peer-review

Molybdenum evidence for expansive sulfidic water masses in ~ 750 Ma oceans

Dahl, T. W., Canfield, D. E., Rosing, Minik Thorleif, Frei, Robert, Gordon, G. W., Knoll, A. H. & Anbar, A. D., 2011, In: Earth and Planetary Science Letters. 311, 3-4, p. 264-274 11 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Reduction of hexavalent chromium by ferrous iron: A process of chromium isotope fractionation and its relevance to natural environments

Døssing, L. N., Dideriksen, K., Stipp, S. L. S. & Frei, Robert, 2011, In: Chemical Geology. 285, 1-4, p. 157-166 10 p.

Research output: Contribution to journal › Journal article › Research › peer-review

The geodynamic evolution of the eastern Sierras Pampeanas based on geochemical, Sm-Nd, Pb-Pb and SHRIMP data

Drobe, M., Lopez de Luchi, M., Steenken, A., Wemmer, K., Naumann, R., Frei, Robert & Siegesmund, S., 2011, In: International Journal of Earth Sciences. 100, 2-3, p. 631-657 27 p.

Research output: Contribution to journal › Journal article › Research › peer-review

The behavior of molybdenum and its isotopes across the chemocline and in the sediments of sulfidic Lake Cadagno, Switzerland

Dahl, Tais Wittchen, Anbar, A. D., Gordon, G. W., Rosing, Minik Thorleif, Frei, Robert & Canfield, D. E., Jan 2010, In: Geochimica et Cosmochimica Acta. 74, 1, p. 144-163 20 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Compositional variations in the Mesoarchean chromites of the Nuggihalli schist belt, Western Dharwar Craton (India): potential parental melts and implications for tectonic setting

Mukherjee, R., Mondal, S. K., Rosing, Minik Thorleif & Frei, Robert, 2010, In: Contributions to Mineralogy and Petrology. 160, 6, p. 865-885 21 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Geochemistry of Precambrian sedimentary rocks used to solve stratigraphical problems: An example from the Neoproterozoic Volta basin, Ghana

Kalsbeek, F. & Frei, Robert, 2010, In: Precambrian Research. 176, 1-4, p. 65-76 12 p.

Research output: Contribution to journal › Journal article › Research › peer-review

New age (ca. 2970 Ma), mantle source composition and geodynamic constraints on the Archean Fiskenæsset anorthosite complex, SW Greenland.

Polat, A., Frei, Robert, Scherstén, A. & Appel, P. W. U., 2010, In: Chemical Geology. 277, 1-2, p. 1-20

Research output: Contribution to journal › Journal article › Research › peer-review

Removal of natural organic dyes from wool- implications for ancient textile provenance

Frei, Karin Margarita, Vanden Berghe, I., Frei, Robert, Mannering, U. & Lyngstrøm, Henriette Syrach, 2010, In: Journal of Archaeological Science. 37, 9, p. 2136-2145 10 p.

Research output: Contribution to journal › Journal article › Research › peer-review

Time constraints on the tectonic evolution of the eastern Sierras Pampeanas (Central Argentina).

Siegesmund, S., Steenken, A., Martino, R. D., Wemmer, K., Lopez de Luchi, M. G., Frei, Robert, Presnyakov, S. & Guereschi, A., 2010, In: International Journal of Earth Sciences. 99, 6, p. 1199-1226

Research output: Contribution to journal › Journal article › Research › peer-review

Characterization of enriched lithospheric mantle components in ~2.7 Ga banded iron formations: an example from the Tati Greenstone Belt, Northeastern Botswana

Døssing, L. N., Frei, Robert, Stendal, H. & Mapeo, R., 2009, In: Precambrian Research. 172, 3-4, p. 334-356

Research output: Contribution to journal › Journal article › Research › peer-review

Dacitic ocelli in mafic lavas, 3.7-3.8 Ga Isua greenstone belt, Western Greenland: geochemical evidence for partial melting of oceanic crust and magma mixing

Appel, P. W. U., Polat, A. & Frei, Robert, 2009, In: Chemical Geology. 258, p. 105-124

Research output: Contribution to journal › Journal article › Research › peer-review

Fluctuations in Precambrian atmospheric oxygenation recorded by chromium isotopes

Frei, Robert, Gaucher, C., Canfield, D. E. & Poulton, S. W., 2009, In: Nature. 461, p. 250-253

Research output: Contribution to journal › Journal article › Research › peer-review

Lead-isotope and trace-element geochemistry of Paleoproterozoic metasedimentary rocks in the Lead and Rochford basins (Black Hills, South Dakota, USA): implications for genetic models, mineralization ages, and sources of ore leads for the Homestake gold deposit

Frei, Robert, Dahl, P. S., Frandsson, M. M., Jensen, L. A., Hansen, T. R., Terry, M. P. & Frei, Karin Margarita, 2009, In: Precambrian Research. 172, 1-2, p. 1-24

Research output: Contribution to journal › Journal article › Research › peer-review

On the valency state of radiogenic lead in zircon and its consequences

Kramers, J., Frei, Robert, Newville, M., Kober, B. & Villa, I., 2009, In: Chemical Geology. 261, p. 4-11

Research output: Contribution to journal › Journal article › Research › peer-review

Provenance of ancient textiles: a pilot study evaluating the Sr isotope system in wool

Frei, Karin Margarita, Frei, Robert, Mannering, U., Gleba, M., Nosch, Marie Louise Bech & Lyngstrøm, Henriette Syrach, 2009, In: Archaeometry. 51, 2, p. 252-276 25 p.

Research output: Contribution to journal › Journal article › Research › peer-review