Robert Frei

Robert Frei

Professor

ORCID: 0000-0001-7708-9881

Publication year:
All
201 - 250 out of 381Page size: 50
  1. 2012
  2. Published

    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

  3. Published

    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

  4. Published

    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

  5. Published

    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

  6. Published

    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

  7. Published

    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

  8. Published

    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

  9. Published

    Stable Chromium isotopes as tracer for paleoclimatic processes recorded in marine carbonates of the Late Neoproterozoic

    Rodler, A., Frei, Robert & Gaucher, C., 2012.

    Research output: Contribution to conference › Conference abstract for conference › Research

  10. Published

    Stable Chromium isotopes as tracer for paleoclimatic processes recorded in marine carbonates of the Late Neoproterozoic

    Rodler, A., Frei, Robert, Gaucher, C., Ullmann, C. V. & Korte, Christoph, 2012, p. 142.

    Research output: Contribution to conference › Conference abstract for conference › Research

  11. Published

    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

  12. 2013
  13. Published

    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

  14. Published

    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

  15. Published

    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

  16. Published

    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

  17. Published

    Cr(VI)-calcite coprecipitation: implications for the use of Cr isotopes as paleoclimatic proxy

    Rodler, A., Dietzel, M. & Frei, Robert, 2013.

    Research output: Contribution to conference › Conference abstract for conference › Research

  18. Published

    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

  19. Published

    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

  20. Published

    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

  21. Published

    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

  22. Published

    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

  23. Published

    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

  24. Published

    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

  25. Published

    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

  26. Published

    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

  27. Published

    Redox effect on the Cr isotope proxy: transitional signal of associated cap-carbonates, BIF and black shale, Chuos Formation (Namibia)

    Rodler, A., Frei, Robert & Gaucher, C., 2013.

    Research output: Contribution to conference › Conference abstract for conference › Research

  28. Published

    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

  29. Published

    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

  30. 2014
  31. Published

    Integrating bed-by-bed palaeobiological and geochemical proxies through the onset of the Great Ordovician Biodiversification Event on Baltica

    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., 2014, p. 81.

    Research output: Contribution to conference › Conference abstract for conference › Research

  32. Published

    Macrofossil Geochemistry: Palaeoenvironmental application

    Ullmann, C. V., Pereira, N. S., Frei, Robert & Korte, Christoph, 2014, p. 32.

    Research output: Contribution to conference › Conference abstract for conference › Research

  33. Published

    The Behaviour of Chromium Isotopes during the Oxidative Weathering of Ultramafic Rocks

    Paulukat, C. S., Døssing, L. N., Mondal, S. K., Vögelin, A. R. & Frei, Robert, 2014.

    Research output: Contribution to conference › Conference abstract for conference › Research › peer-review

  34. Published

    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

  35. Published

    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

  36. Published

    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

  37. Published

    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

  38. Published

    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

  39. Published

    Chromium isotope fractionation during oxidative weathering of a modern basaltic weathering profile.

    D'Arcy, J. M., Døssing, L. N. & Frei, Robert, 8 Jun 2014. 1 p.

    Research output: Contribution to conference › Poster › Research

  40. Published

    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

  41. Published

    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

  42. Published

    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

  43. Published

    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

  44. 2015
  45. Published

    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

  46. Published

    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. 433–449

    Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research › peer-review

  47. Published

    Chromium isotope fractionation during coprecipitation with calcium carbonate

    Rodler, A., Sánchez-Pastor, N., Fernández-Díaz, L. & Frei, Robert, 2015. 1 p.

    Research output: Contribution to conference › Conference abstract for conference › Research

  48. Published

    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

  49. Published

    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

  50. Published

    Geochemistry of the belemnite rostrum: Genesis and diagenesis

    Ullmann, C. V., Frei, Robert, Korte, Christoph & Hesselbo, S. P., 2015, p. 3203.

    Research output: Contribution to conference › Conference abstract for conference › Research › peer-review

  51. Published

    Global Cr-isotope distributions in surface seawater and incorporation of Cr isotopes into carbonate shells

    Paulukat, C. S., Frei, Robert, Vögelin, A. R. & Samankassou, E., 2015.

    Research output: Contribution to conference › Conference abstract for conference › Research › peer-review

  52. Published

    Macrofossil calcite: challenges and benefits of heterogeneity

    Ullmann, C. V., Korte, Christoph, Frei, Robert & Hesselbo, S. P., 2015, p. p. 61.

    Research output: Contribution to conference › Conference abstract for conference › Research

  53. Published

    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

  54. Published

    Reading the record: Understanding heterogeneity in macrofossil geochemistry

    Ullmann, C. V., Frei, Robert, Korte, Christoph & Hesselbo, S. P., 2015, p. p. 375 .

    Research output: Contribution to conference › Conference abstract for conference › Research

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