Robert Frei
Professor
Geology
Øster Voldgade 10
1350 København K
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Osmium isotopes in the Wiedemann Fjord mantle xenoliths: A unique record of cratonic mantle formation by melt depletion in the Archaean
Hanghøj, K., Kelemen, P., Bernstein, S., Blusztajn, J. & Frei, Robert, 2001, In: Geochemistry, Geophysics and Geosystem. 2Research output: Contribution to journal › Journal article › Research › peer-review
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The Wiedemann Fjord Mantle Xenoliths, a Unique Record of Cratonic Mantle Formation by Melt Depletion in the Archean
Hanghøj, K., Keleman, P. B., Bernstein, S., Blusztajn, J. & Frei, Robert, 1999, In: EOS Trans. Am. Geophys. Union. Vol. 81, p. 1078Research output: Contribution to journal › Conference abstract in journal › Research
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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
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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
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Oceanographic Change in the Late Cretaceous Chalk Sea (Denmark): Clues from Chromium Isotopes
Gilleaudeau, G. J., Vögelin, A. R., Thibault, Nicolas Rudolph, Moreau, J., Korte, Christoph, Ullmann, C. V. & Frei, Robert, 2016, p. p. 944.Research output: Contribution to conference › Conference abstract for conference › Research › peer-review
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Isotope dating of residual kaolin deposits in Europe (Tirschenreuth, Germany and St. Yrieix, France)
Gilg, H. A. & Frei, Robert, 1997, Energy and Mineral Resources for the 21st Century, Geology of Mineral Deposits, Mineral Economics: Proceedings of the 30th International Geological Congress. Rongfu, P. (ed.). Vol. 9. p. 123-133Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review
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Isotope geochemistry and origin of illite-smectite and kaolinite from the Seilitz and Kemmlitz kaolin deposits, Germany
Gilg, H. A., Weber, B., Kasbohm, J. & Frei, Robert, 2003, In: Clay Minerals. 38, p. 95-112Research output: Contribution to journal › Journal article › Research › peer-review
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A new illite deposit near Le-Puy-en-Velay (France): Genesis and usage for waste encapsulation
Gilg, H. A., Haus, R. & Frei, Robert, 1997, Mineral Deposits: Research and exploration - where do they meet ? . Papunen, H. (ed.). CRC Press/Balkema, p. 717-720Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review
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Metamorphism and polygenesis of the Madem Lakkos polymetallic sulfide deposit, Chalkidiki, Greece: a discussion
Gilg, H. A., Frei, Robert, Kalogeropoulos, S. I. & Nicolaou, M., 1992, In: Economic Geology. 87, p. 1184-1193Research output: Contribution to journal › Journal article › Research › peer-review
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Chronology of magmatism and mineralization in the Kassandra mining area, Greece: The potentials and limitations of dating hydrothermal illites
Gilg, H. A. & Frei, Robert, 1994, In: Geochimica et Cosmochimica Acta. 58, p. 2107-2122Research output: Contribution to journal › Journal article › Research › peer-review
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Isotope systematics of kaolinization: Implications for dating of continental weathering
Gilg, H. A. & Frei, Robert, 1995, In: Berichte der Deutschen Mineralogischen Gesellschaft (Beihefte zum European Journal of Mineralogy). 7Research output: Contribution to journal › Journal article › Research › peer-review
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Discussions: Metamorphism and polygenesis of the madem lakkos polymetallic sulfide deposit, Chalkidiki, Greece-a discussion
Gilg, H. A., Frei, Robert, Kalogeropoulos, S. I. & Nicolaou, M., 1 Jul 1992, In: Economic Geology . 87, 4, p. 1184-1187 4 p.Research output: Contribution to journal › Comment/debate › Research › peer-review
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Isotope geochemistry and origin of illite-smectite and kaolinite from the Seilitz and Kemmlitz kaolin deposits, Saxony, Germany
Gilg, H. A., Weber, B., Kasbohm, J. & Frei, Robert, 1 Mar 2003, In: Clay Minerals. 38, 1, p. 95-112 18 p.Research output: Contribution to journal › Journal article › Research › peer-review
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U-Pb geochronologic study of magmatic zircon in Paleoproterozoic granitic pegmatite and associated metapelites, Black Hills, South Dakota: Implications for gold petrogenesis and sedimentary provenance
Ghosh, A., Frei, Robert, Whitehouse, M. J. & Dahl, P. S., 2008, Geological Society of America Abstracts with Programs,. Vol. 40(6). p. 145-160Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research
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Distribution of platinum-group elements and Os isotopes in chromite ores from Mayari-Baracoa Ophiolitic Belt (eastern Cuba)
Gervilla, F., Proenza, J. A., Frei, Robert, Gonzales-Jimenes, J. M., Garrido, C. J., Melgarejo, J. C., Meibom, A., Diaz-Martinez, R. & Lavaut, W., 2005, In: Contributions to Mineralogy and Petrology. 150, p. 589-607Research output: Contribution to journal › Journal article › Research › peer-review
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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
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The Archean-Proterozoic Boundary and the Great Oxidation Event
Gaucher, C. & Frei, Robert, 2019, Chemostratigraphy Across Major Chronological Boundaries. Sial, A. N., Gaucher, C., Ramkumar, M. & Ferreira, V. P. (eds.). Wiley, p. 35-45 11 p. (Geophysical Monograph Series, Vol. 240).Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research › peer-review
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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
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Chemostratigraphy of Neoproterozoic Banded Iron Formation (BIF): Types, Age and Origin
Gaucher, C., Sial, A. N. & Frei, Robert, 2015, Chemostratigraphy: Concepts, Techniques, and Applications. Ramkumar, M. (ed.). Elsevier, p. 433–449Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research › peer-review
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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
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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
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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
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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. 209-230Research output: Contribution to journal › Journal article › Research › peer-review
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Mono-sample pb-pb dating of pyrrhotite and tourmaline: Proterozoic vs. Archean intracratonic gold mineralization: reply
Frei, Robert & Pettke, T., 1 Dec 1997, In: Geology. 25, 7, p. 670-671 2 p.Research output: Contribution to journal › Letter › Research › peer-review
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A multi-isotopic and trace element investigation of the Cretaceous-Tertiary boundary layer at Stevns Klint, Denmark - inferences for the origin and nature of siderophile and lithophile element geochemical anomalies
Frei, Robert & Frei, K. M., 2002, In: Earth and Planetary Science Letters. 203, p. 691-708Research output: Contribution to journal › Journal article › Research › peer-review
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Re-Os, Sm-Nd isotope- and REE systematics on komatiites and pilow basalts from the Earth's oldest oceanic crustal fragments (Isua Supracrustal Belt, W Greenland)
Frei, Robert & Kastbjerg Jensen, B., 2003, In: Chemical Geology. 196, p. 163-191Research output: Contribution to journal › Journal article › Research › peer-review
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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
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A pre-3.74 Ga old tectono-metamorphic event in the outer Isua (Western Greenland) supracrustal belt: evidence from Pb stepwise leaching of sulfide-bearing quartz-tourmaline veins.
Frei, Robert, Rosing, Minik Thorleif, Krogstad, E. J., Storey, M., Ulfbeck, D. G. & Albarede, F., 1998, In: EOS : Transactions. 1998 Fall Meeting 79, 45 Suppl., p. 932Research output: Contribution to journal › Journal article › Research
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Single mineral Pb-Pb dating
Frei, Robert & Kamber, B. S., 1995, In: Earth and Planetary Science Letters. 129, p. 261-268Research output: Contribution to journal › Journal article › Research › peer-review
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The extent of inter-mineral isotope equilibrium: a systematic bulk U-Pb step leaching (PbSL) isotope study of individual minerals from the Tertiary granite of Jerissos (northern Greece)
Frei, Robert, 1996, In: European Journal of Mineralogy. 8, p. 1175-1189Research output: Contribution to journal › Journal article › Research › peer-review
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Search for traces of the late heavy bombardment on Earth - Results from high precision chromium isotopes.
Frei, Robert & Rosing, Minik Thorleif, 2005, In: Earth and Planetary Science Letters. 236, p. 28-40Research output: Contribution to journal › Journal article › Research › peer-review
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Apparent controversies of Pb-Pb and Sm-Nd isotope systematics in the Archean Isua (West Greenland) BIF's: preservation of primary signatures vs. secondary disturbances
Frei, Robert, Bridgewater, D. & Rosing, Minik Thorleif, 1997, In: EOS : Transactions. 78, 46, p. F830Research output: Contribution to journal › Journal article › Research › peer-review
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Mono-sample Pb-Pb dating of pyrrhotite and tourmaline: Archean vs. Proterozoic gold mineralization in Zimbabwe
Frei, Robert & Pettke, T., 1996, In: Geology. 24, p. 823-826Research output: Contribution to journal › Journal article › Research › peer-review
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Source heterogeneity for the major components of ~3.7 Ga banded iron formations (Isua Greenstone Belt, Western Greenland): tracing the nature of interacting water masses in BIF formation
Frei, Robert & Polat, A., 2006, In: Earth and Planetary Science Letters. 253, p. 266-281Research output: Contribution to journal › Journal article › Research › peer-review
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Sulfur in bulk rock and igneous apatite: tracing mineralized and barren trends in intrusions
Frei, Robert, 1996, In: Schweizerische Mineralogische und Petrographische Mitteilungen. 127, p. 57-73Research output: Contribution to journal › Journal article › Research › peer-review
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Unraveling the tectono-metamorphic history in the Isua supracrustals (West Greenland): Mineral stepwise leaching evidence for early Archean metasomatic-metamorphic events.
Frei, Robert, Rosing, Minik Thorleif, Krogstad, E. J., Storey, M. & Albarede, F., 1999, publisher. p. 91Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research
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Chromium isotopes in the marine environment through time: a suitable paleoredox tracer?
Frei, Robert, 2008, Geochim. Cosmochim.: Acta. Vol. 72/12S. p. A283Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research
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Blyisotoper - Eksempler på deres anvendelse
Frei, Robert & Stendal, H., 2003, In: Varv. 1, p. 23-32Research output: Contribution to journal › Journal article › Research
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Hydrothermal - metasomatic and tectono-metamorphic processes in the Isua Supracrustal Belt (West Greenland): a multi-isotopic investigation of their effects on the Earth's oldest oceanic crustal sequence
Frei, Robert, Rosing, Minik Thorleif, Waight, Tod & Ulfbeck, D. G., 2002, In: Geochimica et Cosmochimica Acta. 66, p. 467-486Research output: Contribution to journal › Journal article › Research › peer-review
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Dating a Variscan pressure-temperature loop with staurolite
Frei, Robert, Biino, G. G. & Prospert, C., 1995, In: Geology. 23, p. 1095-1098Research output: Contribution to journal › Journal article › Research › peer-review
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Blyisotoper og deres anvendelse
Frei, Robert, 2002, In: Varv. 4, p. 17-26Research output: Contribution to journal › Journal article › Research
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Geochronology of the late Archean Razi and Chilimanzi suites of granites in Zimbabwe: implications for the late Archean tectonics of the Limpopo Belt and Zimbabwe Craton
Frei, Robert, Blenkinsop, T. G. & Schönberg, R., 1999, In: South African Journal of Geology. 102, p. 55-63Research output: Contribution to journal › Journal article › Research › peer-review
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Re-Os, Sm-Nd isotope- and REE systematics on ultramafic rocks and pillow basalts from the Earth's oldest oceanic crustal fragments (Isua Supracrustal Belt and Ujaragssuit nunât area, W Greenland)
Frei, Robert & Jensen, B. K., 15 May 2003, In: Chemical Geology. 196, 1-4, p. 163-191 29 p.Research output: Contribution to journal › Journal article › Research › peer-review
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A new Pb-dating technique for gold deposits: examples from Zimbabwe
Frei, Robert, 1995.Research output: Contribution to conference › Conference abstract for conference › Research
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Trace element and isotopic characterization of Neoarchean and Paleoproterozoic iron formations in the Black Hills (South Dakota, USA): assessment of chemical change during 2.9-1.9 Ga deposition bracketing the 2.4-2.2 Ga first rise of atmospheric oxygen
Frei, Robert, Frei, K. M., Rintza Hansen, T., Munck Frandsson, M. & Apel Jensen, L., 2008, In: Precambrian Research. 162, p. 441-474 33 p.Research output: Contribution to journal › Journal article › Research › peer-review
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The Hadean upper mantle conundrum: Evidence for source depletion and enrichment from Sm-Nd, Re-Os, and Pb isotopic compositions in 3.71 Gy boninite-like metabasalts from the Isua Supracrustal Belt, Greenland
Frei, Robert, Polat, A. & Meibom, A., 2004, In: Geochimica et Cosmochimica Acta. Vol. 68, p. 1645-1660Research output: Contribution to journal › Journal article › Research › peer-review
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Trace element and isotopic characterization of Neoarchean - Paleoproterozoic BIFs (Black Hills, South Dakota, USA) straddling thefirst rise of atmospheric oxygen between 2.4 and 2.0 Ga
Frei, Robert & Dahl, P. S., 2008, In: Geochim. Cosmochim.. Acta 71, Supplement 1, p. A296Research output: Contribution to journal › Conference abstract in journal › Research
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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
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Single mineral dating by the Pb-Pb step-leaching method, assessing the mechanism
Frei, Robert, Villa, I. M., Nägler, T. F., Kramers, J. D., Przybylowicz, W. J., Prozesky, V. M., Hofmann, B. A. & Kamber, B. S., 1997, In: Geochimica et Cosmochimica Acta. 61, p. 393-414Research output: Contribution to journal › Journal article › Research › peer-review
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Os isotope heterogeneity of the convecting upper mantle: The Mayari- Btacoa Ophiolitic Belt (eastern cuba)
Frei, Robert, Gervilla, F., Meibom, A. & Proenza, J. A., 2006, In: Earth and Planetary Science Letters. 241, p. 466-476Research output: Contribution to journal › Journal article › Research
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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, J. A., 5 Oct 2020, In: Chemical Geology. 552, 16 p., 119785.Research output: Contribution to journal › Journal article › Research › peer-review
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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
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Chromium isotopes in 3.8 Ga metamorphosed sediments: no indications for cosmic components associated with an early meteorite bombardment of the Earth
Frei, Robert & Rosing, Minik Thorleif, 2003.Research output: Contribution to conference › Conference abstract for conference › Research
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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
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Mono-sample Pb-Pb dating of pyrrhotite and tourmaline: Archean vs. Proterozoic gold mineralization in Zimbabwe. A Reply
Frei, Robert & Pettke, T., 1997, In: Geology. 27, p. 670-671Research output: Contribution to journal › Journal article › Research › peer-review
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Controversial Pb-Pb and Sm-Nd isotope results in the early Archean Isua (West Greenland) oxide iron formation: Preservation of primary signatures versus secondary disturbances.
Frei, Robert, Bridgewater, D., Rosing, Minik Thorleif & Stecher, O., 1999, In: Geochimica et Cosmochimica Acta. 63, p. 473-488Research output: Contribution to journal › Journal article › Research › peer-review
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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. 1-24Research output: Contribution to journal › Journal article › Research › peer-review
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The least radiogenic terrestrial leads: implications for the early Archean crustal evolution and hydrothermal-metasomatic processes in the Isua Supracrustal Belt (West Greenland)
Frei, Robert & Rosing, Minik Thorleif, 2001, In: Chemical Geology. 181, p. 47-66Research output: Contribution to journal › Journal article › Research › peer-review
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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
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Behaviour of Re-Os, Sm-Nd, and U-Pb systematics in hydrothermal ores. WRI-9
Frei, Robert, Nägler, T. F., Schönberg, R. & Kramers, J. D., 1998, Water-Rock Interaction, Balkema/Rotterdam/Brookfield. Arehart, G. B. & Hulston, J. R. (eds.). p. 541-544Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review
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Tracing redox processes during paleoclimatic changes in the Neoproterozoic: stable chromium isotopic results from the Arroyo del Soldado Group (Ediacaran, Uruguay)
Frei, Robert & Gaucher, C., 2007.Research output: Contribution to conference › Conference abstract for conference › Research
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Re-Os, Sm-Nd, U-Pb and stepwise Pb leaching isotope systematics in shear-zone hosted gold mineralization: genetic tracing and age constraints of crustal hydrothermal activity
Frei, Robert, Nägler, T. F., Schönberg, R. & Kramers, J. D., 1998, In: Geochimica et Cosmochimica Acta. 62, p. 1925-1936Research output: Contribution to journal › Journal article › Research › peer-review
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Os isotope heterogeneity of the upper mantle: Evidence from the Mayarí-Baracoa ophiolite belt in eastern Cuba
Frei, Robert, Gervilla, F., Meibom, A., Proenza, J. A. & Garrido, C. J., 31 Jan 2006, In: Earth and Planetary Science Letters. 241, 3-4, p. 466-476 11 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Inherited crustal components in the porphyry copper style mineralization of Skouries, Northern Greece: implications from combined Pb-Sr isotopic results
Frei, Robert, 1993, In: Schweizerische Mineralogische und Petrographische Mitteilungen.Research output: Contribution to journal › Conference abstract in journal › Research
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Efficient N-TIMS Re-isotope measurements on outgassed Ta filaments: very low filament blanks determined by a "standard addition" approach
Frei, Robert, Nägler, T. F. & Meisel, T., 1996, In: International Journal of Mass Spectrometry. 76, p. L7-L10Research output: Contribution to journal › Journal article › Research › peer-review
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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
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Efficient N-TIMS rhenium isotope measurements on outgassed tantalum filaments: Very low filament blanks determined by a "standard addition" approach
Frei, Robert, Nägler, T. F. & Meisel, T., 1 Jan 1996, In: International Journal of Mass Spectrometry and Ion Processes. 153, 2-3, p. L7Research output: Contribution to journal › Journal article › Research › peer-review
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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
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The Hadean upper mantle conundrum: Evidence for source depletion and enrichment from Nd and Os isotopic compositions in 3.71 Gy boninite-like metabasalts from the Isua Supracrustal Belt
Frei, Robert, Polat, A. & Meibom, A., 2004, In: Geochimica et Cosmochimica Acta. 11S, p. A744Research output: Contribution to journal › Conference abstract in journal › Research
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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
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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
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Earth´s oldest BIFs (Isua, W Greenland): constraints from Ge/Si ratios, REE systematics and Sm-Nd and Pb isotopes for differentinteracting water masses during their formation
Frei, Robert & Polat, A., 2008, In: Geochim. Cosmochim.. Acta 71, Supplement 1, p. A296Research output: Contribution to journal › Conference abstract in journal › Research
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Surface water oxygenation and low bioproductivity during deposition of iron formation of the Jacadigo Group (Brazil): Insights from combined cadmium – Chromium isotopes
Frei, Robert, Gaucher, C., Boggiani, P. C., Frederiksen, J. A., Walker, Samantha Renee, Fernandes, H. A. & Caxito, F., 5 Jul 2024, In: Chemical Geology. 657, 122101.Research output: Contribution to journal › Journal article › Research › peer-review
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The evolution of the mineralizing fluid in the porphyry copper system of Skouries, NE Chalkidiki, (Greece): evidence from combined Pb-Sr and stable isotope data
Frei, Robert, 1995, In: Economic Geology . 90, p. 746-762Research output: Contribution to journal › Journal article › Research › peer-review
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Surface water oxygenation and low bioproductivity during deposition of iron formation of the Jacadigo Group (Brazil): Insights from combined cadmium – Chromium isotopes
Frei, Robert, Claudio, G., Boggiani, P. C., Frederiksen, J. A., Walker, Samantha Renee, Albuquerque Fernandes, H. & Caxito, F. A., 2024, In: Chemical Geology. 657, 122101.Research output: Contribution to journal › Journal article › Research › peer-review
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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, J. A. & Lehmann, B., 1 Mar 2021, In: Chemical Geology. 563, 20 p., 120061.Research output: Contribution to journal › Journal article › Research › peer-review
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Mineral occurrences in central East Greenland (70 N-75 N) and their relation to the Caledonian orogeny: a Sr-Nd-Pb isotopic study of scheelite
Frei, Robert & Stendal, H., 2008, The Greenland Caledonides - evolution of the northeast margin of Laurentia. Smith, M. P., Higgins, A. K. & Gilotti, J. A. (eds.). Boulder, Colo.: The Geological Society of America, p. 293-306 (Memoir / Geological Society of America; No. 202).Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research
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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
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Fluctuations in Precambrian atmospheric oxygenation recorded by chromium isotopes
Frei, Robert, Gaucher, C., Canfield, D. E. & Poulton, S. W., 2009, In: Nature. 461, p. 250-253Research output: Contribution to journal › Journal article › Research › peer-review
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Isotope (Pb, Rb-Sr, S, O, C, U-Pb) geochemical investigations on Tertiary intrusives and related mineralizations in the Serbomacedonian Pb-Zn, Sb+Cu-Mo metallogenetic province in Northern Greece
Frei, Robert, 1992, Swiss Federal Institute of Technology (ETH) Zürich, Switzerland. 231 p.Research output: Book/Report › Ph.D. thesis › Research
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Studies of progressive leaching in single mineral Pb/Pb dating: Nuclear Microprobe Technology and Applications
Frei, Robert, Prozesky, V. M. & Przybylowicz, W., 1997, In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. B 130, p. 676-681Research output: Contribution to journal › Journal article › Research › peer-review
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Geochronology of the late Archaean Razi and Chilimanzi suites of granites in Zimbabwe: Implications for the late Archaean tectonics of the Limpopo Belt and Zimbabwe Craton
Frei, Robert, Blenkinsop, T. G. & Schönberg, R., 1 Mar 1999, In: South African Journal of Geology. 102, 1, p. 55-63 9 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Mono-sample Pb-Pb dating of pyrrhotite and tourmaline: Proterozoic vs. Archean intracratonic gold mineralization in Zimbabwe
Frei, Robert & Pettke, T., 1 Jan 1996, In: Geology. 24, 9, p. 823-826 4 p.Research output: Contribution to journal › Journal article › Research › peer-review
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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
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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
- Published
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
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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
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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
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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
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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
- Published
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
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Provenance of ancient textiles - a pilot study evaluating the strontium isotope system in wool
Frei, Karin Margarita, Frei, Robert, Nosch, Marie Louise Bech, Mannering, U., Gleba, M. & Lyngstrøm, Henriette Syrach, 2009, In: Archaeometry. 51, 2, p. 252-276 25 p.Research output: Contribution to journal › Journal article › Research › peer-review
- Published
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. 439-466Research output: Contribution to journal › Journal article › Research › peer-review
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Cadmium isotopes in Bahamas platform carbonates: A base for reconstruction of past surface water bioproductivity and their link with chromium isotopes
Frederiksen, J. A., 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
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Combined cadmium and chromium isotopes record a collapse of bioproductivity across the Cretaceous—Paleogene boundary in the Danish basin
Frederiksen, J. A., 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
- Published
Variations of cadmium concentrations and cadmium isotopes in Mytilus from North Atlantic and Baltic Sea
Frederiksen, J. A. & Frei, Robert, 2021. 1 p.Research output: Contribution to conference › Conference abstract for conference › Research
- Published
Cadmium isotopes in Late Ediacaran–Early Cambrian Yangtze Platform carbonates – reconstruction of bioproductivity in ambient surface seawater
Frederiksen, J. A., 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
- Published
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, J. A., Ullmann, C. V., Frei, Robert & Korte, Christoph, 2022, In: Newsletters on Stratigraphy. 55, 3, p. 311–331Research output: Contribution to journal › Journal article › Research › peer-review
- Published
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
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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
ID: 11756
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Large Igneous Province volcanism, ocean anoxia and marine mass extinction
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Mapping human mobility during the third and second millennia BC in present-day Denmark
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Tracing the dynamic life story of a Bronze Age Female
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