Robert Frei

Robert Frei

Professor

ORCID: 0000-0001-7708-9881

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  1. Published

    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

  2. Published

    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

  3. Published

    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

  4. Published

    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

  5. Published

    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

  6. Published

    Priscoan “4.00-4.03 Ga” orthogeneisses from northwestern Canada - by Samuel A. Bowring and Ian S. Williams: Discussion

    Whitehouse, M. J., Nagler, T. F., Moorbath, S., Kramers, J. D., Kambler, B. S. & Frei, Robert, 1 Jan 2001, In: Contributions to Mineralogy and Petrology. 141, 2, p. 248-250 3 p.

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

  7. Published

    Priscoan (4.00-4.03 Ga) orthogneisses from northwestern Canada - by S.A. Bowring and I.S. Williams (2000): discussion

    Whitehouse, M., Nägler, T. F., Moorbath, S., Kramers, J. D., Kamber, B. S. & Frei, Robert, 2001, In: Contributions to Mineralogy and Petrology. 141, p. 248-250

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

  8. Published

    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

  9. Published

    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

  10. Published

    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

  11. Published

    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

  12. Published

    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

  13. Published

    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

  14. Published

    Assessing Mass-dependent Isotope Fractionation of Cerium

    Weber, T., Frei, Robert & Rosing, Minik Thorleif, 2008, In: EOS : Transactions. 53

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

  15. Published

    Cerium Isotope Fractionation during Oxidative Precipitation.

    Weber, T., Frei, Robert, Rosing, Minik Thorleif, Canfield, D., Dideriksen, K., Nedel, S., Stipp, S. L. S., Telouk, P. & Albarede, F., 2009. 1 p.

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

  16. Published

    Timing between granitoid emplacement and associated gold mineralization: examples from the ca. 2.7 Ga Harare-Shamva Greenstone Belt, Northern Zimbabwe

    Vinyu, M. L., Frei, Robert, Frei, Robert & Jelsma, H. A., 1996, In: Canadian Journal of Earth Sciences. 33, 7, p. 981-992

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

  17. Published

    Geochemical characteristics of the Quaternary volcanic rocks from Hatay region, Southern Turkey: Evidence for lithospheric mantle source. Geochim

    Varol, E., Frei, Robert, Alpaslan, M., Kurt, M. A. & Temmel, A., 2007, In: Geochim. Cosmochim.. Acta 71, Supplement 1, p. A1059

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

  18. Published

    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

  19. Published

    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

  20. 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

  21. Published

    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

  22. Published

    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

  23. 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

  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

    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

  26. 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

  27. 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

  28. Published

    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

  29. 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

  30. Published

    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

  31. Published

    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

  32. Published

    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

  33. Published

    Petrogenesis of Delihalil Quaternary basaltic volcanism, South Anatolia, Turkey

    Temel, A., Frei, Robert, Alpaslan, M. & Kurt, M. A., 2007, In: Geochim. Cosmochim.. Acta 71, Supplement 1, p. A1012

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

  34. Published

    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

  35. 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

  36. 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

  37. 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

  38. 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

  39. Published

    3.9 Ga pillow basalts from Isua, Greenland: Pb isotopic evidence.

    Storey, Michael, Krogstad, E. J., Frei, Robert, Albarede, F. & Rosing, Minik Thorleif, 1998, publisher. American Geophysical Union, 932 p.

    Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

  40. Published

    The Palaeoproterozoic Kangerluluk gold-copper mineralization (Southeast Greenland): Pb and Nd isotopic constraints on its timing and genesis

    Stendal, H., Frei, Robert, Hamilton, M. A. & Mueller, W. U., 2001, In: Mineralium Deposita. 36, p. 177-188

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

  41. Published

    Gold occurrences and lead isotopes in Ketilidian Mobile Belt, South Greenland

    Stendal, H. & Frei, Robert, 2000, In: Transactions Institution of Mining and Metallurgy (Sektion B). 109, p. B6-B13

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

  42. Published

    A lead isotope study of an Archaean gold prospect in the Attu region, Nagssugtoqidian orogen, West Greenland

    Stendal, H., Frei, Robert & Stensgaard, B. M., 2006, In: GEOLOGICAL SURVEY OF DENMARK AND GREENLAND BULLETIN. 11, p. 53-60

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

  43. Published

    207Pb-206Pb dating of magnetite, monazite and allanite in the central and northern Nagssugtoqidian orogen, West Greenland

    Stendal, H., Secher, K. & Frei, Robert, 2006, In: GEOLOGICAL SURVEY OF DENMARK AND GREENLAND BULLETIN. 11, p. 101-114

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

  44. Published

    Pan-African(?) rutile in the Yaoundé region, Cameroon

    Stendal, H., Toteu, S. F., Frei, Robert, Njel, U. O., Konnerup-Madsen, J., Bassahak, J., Penaye, J. & Nni, J., 2004, 20th Colloquium of African geology, Orleans, France, 2-7 June 2004. Abstract volume. Orleans, p. 385

    Research output: Chapter in Book/Report/Conference proceeding › Preface/postscript › Research

  45. Published

    Provenance of rutile from the Yaounde region, Neoproterozoic Pan-African belt in southern Cameroon (Central Africa)

    Stendal, H., Toteu, S. F., Frei, Robert, Penaye, J., Njel, U. O., Bassahak, J., Nni, J., Kankeu, B., Ngako, V. & Hell, J. V., 2006, In: Journal of African Earth Sciences. 44, p. 443-458

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

  46. Published

    Lead isotopic results of the Mpanda Mineral Field mineralizations (SW Tanzania)

    Stendal, H., Frei, Robert, Muhongo, S., Rasmussen, T. M., Mnali, S., Petro, F. & Temu, E. B., 2004, In: Journal of African Earth Sciences. Vol. 38, p. 437-447

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

  47. Published

    Neoproterozoic to Early Palaeozoic events in the Sierra de San Luis: implications for the Famatinian geodynamics in the Eastern Sierras Pampeanas (Argentina)

    Steenken, A., Siegesmund, S., Lopez de Luchi, M., Frei, Robert & Wemmer, K., 2006, In: Geological Society of London Special Publications. 163, p. 965-982

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

  48. Published

    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

  49. Published

    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

  50. Published

    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

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ID: 11756