Frei, Robert

Fluctuations in Precambrian atmospheric oxygenation recorded by chromium isotopes

Frei, R., Gaucher, C., Poulton, S. W., & Canfield, D. E. (2009) · Nature

Paleontology and Stratigraphy of FossilsGeological and Geochemical Analysis

Cited by 653

Atmospheric oxygenation three billion years ago

Crowe, S. A., Døssing, L. N., Beukes, N. J., Bau, M., Kruger, S. J., Frei, R., & Canfield, D. E. (2013) · Nature

Paleontology and Stratigraphy of FossilsGeological and Geochemical Analysis

Cited by 640

New Lu–Hf and Pb–Pb age constraints on the earliest animal fossils

Barfod, G. H., Albarède, F., Knoll, A. H., Xiao, S., Télouk, P., Frei, R., & Baker, J. (2002) · Earth and Planetary Science Letters

Geological and Geochemical AnalysisPaleontology and Stratigraphy of Fossils

Cited by 251

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

Gilleaudeau, G. J., Frei, R., Kaufman, A. J., Kah, L. C., Azmy, K., Bartley, J. K., Chernyavskiy, P., & Knoll, A. H. (2016) · Geochemical Perspectives Letters

Paleontology and Stratigraphy of FossilsGeochemistry and Elemental Analysis

Cited by 214

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, R. (2018) · Nature Communications

Paleontology and Stratigraphy of FossilsGeological and Geochemical Analysis

Cited by 184

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, R., Guðmundsson, G., Sindbæk, S. M., Woollett, J., et al. (2015) · World Archaeology

Viking Age and Medieval ScandinaviaArchaeology and ancient environmental studies

Cited by 146

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

Frei, R., Gaucher, C., Døssing, L. N., & Sial, A. N. (2011) · Earth and Planetary Science Letters

Paleontology and Stratigraphy of FossilsGeochemistry and Elemental Analysis

Cited by 141

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

Dahl, T. W., Canfield, D. E., Rosing, M. T., Frei, R. E., Gordon, G. W., Knoll, A. H., & Anbar, A. D. (2011) · Earth and Planetary Science Letters

Paleontology and Stratigraphy of FossilsGeochemistry and Elemental Analysis

Cited by 132

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

Frei, R., Poiré, D., & Frei, K. M. (2014) · Chemical Geology

Geochemistry and Elemental AnalysisChromium effects and bioremediation

Cited by 122

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, R., Dahl, P. S., Duke, E. F., Frei, K. M., Hansen, T. R., Frandsson, M. M., & Jensen, L. A. (2008) · Precambrian Research

Paleontology and Stratigraphy of FossilsGeochemistry and Elemental Analysis

Cited by 120

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., Døssing, L. N., Mondal, S. K., Voegelin, A. R., & Frei, R. (2015) · Applied Geochemistry

Chromium effects and bioremediationGeochemistry and Elemental Analysis

Cited by 88

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, R., Døssing, L. N., Gaucher, C., Boggiani, P. C., Frei, K. M., Bech Árting, T., Crowe, S. A., & Freitas, B. T. (2017) · Gondwana Research

Paleontology and Stratigraphy of FossilsGeochemistry and Elemental Analysis

Cited by 65

Chemical and isotopic architecture of the belemnite rostrum

Ullmann, C. V., Frei, R., Korte, C., & Hesselbo, S. P. (2015) · Geochimica et Cosmochimica Acta

Paleontology and Stratigraphy of FossilsCalcium Carbonate Crystallization and Inhibition

Cited by 49

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, R. (2019) · Scientific Reports

Paleontology and Stratigraphy of FossilsGeochemistry and Elemental Analysis

Cited by 30