Robert Frei

2024

Analytical methodological adaptations for sampling ancient pigments in provenance research

Rodler-Rørbo, A., Brøns, C., Tepe, N., Van Ham-Meert, A., Artioli, G., Frei, R., Hofmann, T. & Koeberl, C., 2024, In: Journal of Cultural Heritage. 69, p. 126-134

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

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, R., 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, J. A., Thibault, N., Gilleaudeau, G. J., Bjerrum, C. J., Moreau, J. & Frei, R., 2024, In: Chemical Geology. 654, 24 p., 122058.

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3 Citations (Scopus)

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Geochemistry of Archean anorthosite-bearing layered intrusions

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

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

2 Citations (Scopus)

In the search for the origin of the barley at Norse farms in Greenland

Henriksen, P. S., Frei, R., Stevnsvig, A. M. J. & Gotfredsen, A. B., 2024, In: Journal of Archaeological Science: Reports. 59, 16 p., 104767.

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

Oxidative weathering on the continent and seawater upwelling along the passive continental margin promoted widespread phosphorite formation at the Neoproterozoic-Cambrian boundary in South China

Xu, L., Frank, A., Frei, R., Wang, G., Yuan, P., Fu, X. & Lehmann, B., 2024, In: Chemical Geology. 670, 19 p., 122418.

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

Petrogenesis and Geodynamic Evolution of the Archean Shawmere Anorthosite Complex and Associated Gneisses, Kapuskasing Uplift, Superior Province, Canada

Polat, A., Frei, R., Deng, H., Longstaffe, F. J. & Sotiriou, P., 2024, In: Journal of Petrology. 65, 6, 43 p., egae060.

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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, R., Gaucher, C., Boggiani, P. C., Frederiksen, J. A., Walker, S. R., Albuquerque Fernandes, H. & Caxito, F., 2024, In: Chemical Geology. 657, 19 p., 122101.

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2023

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

Caxito, F. A., Frei, R., 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

C_org, N and Hg-isotopes and Hg chemostratigraphy in the Late Ordovician–early Silurian Transition, Argentine Precordillera

Sial, A. N., Chen, J., Peralta, S., Gaucher, C., Korte, C., Frei, R., Ferreira, V. P., Drude, L., Lacerda, D., Barbosa, J. A., Pereira, N. S., Ricardo, P., Riedel, R. & Gomez, J. C., 2023. 1 p.

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

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

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2 Citations (Scopus)

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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, R., 2023, In: Journal of Hazardous Materials. 451, 15 p., 131193.

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

9 Citations (Scopus)

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, R., 2023, In: Gondwana Research. 124, p. 39-60

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4 Citations (Scopus)

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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-H., Frei, R. & Frei, K. M., 2023, In: Danish Journal of Archaeology. 12, 1, p. 1-25

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2022

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, R., Kristiansen, K. & Frei, K. M., 2022, In: Applied Geochemistry. 144, 14 p., 105405.

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

2 Citations (Scopus)

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

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

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

8 Citations (Scopus)

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, R., 2022, In: Precambrian Research. 372, 20 p., 106600.

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8 Citations (Scopus)

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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, R., 2022, In: Science of the Total Environment. 806, 2, 17 p., 150565.

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10 Citations (Scopus)

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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-F. & Frei, R., 30 May 2022, In: Palaeogeography, Palaeoclimatology, Palaeoecology - An International Journal for the Geo-Sciences. 601, 18 p., 111096.

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10 Citations (Scopus)

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

Ladegaard-Pedersen, P., Frei, R., 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

3 Citations (Scopus)

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, R., Xu, L. & Mao, J., 2022, In: Mineralium Deposita. 57, 7, p. 1167–1187

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23 Citations (Scopus)

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

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

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

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12 Citations (Scopus)

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

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

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1 Citation (Scopus)

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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, R., 2022, In: Precambrian Research. 379, 19 p., 106781.

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2 Citations (Scopus)

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

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

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4 Citations (Scopus)

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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, R. & Korte, C., 2022, In: Newsletters on Stratigraphy. 55, 3, p. 311–331

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1 Citation (Scopus)

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

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

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9 Citations (Scopus)

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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, R., 20 Feb 2022, In: Chemical Geology. 590, 12 p., 120705.

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15 Citations (Scopus)

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2021

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

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

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

34 Citations (Scopus)

Chromium isotope heterogeneity on a modern carbonate platform

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

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

12 Citations (Scopus)

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

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

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4 Citations (Scopus)

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

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

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3 Citations (Scopus)

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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, R., 1 Aug 2021, In: Journal of South American Earth Sciences. 109, 6 p., 103282.

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

10 Citations (Scopus)

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, R., 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.

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26 Citations (Scopus)

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

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

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14 Citations (Scopus)

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, R., Uhlein, A., Sial, A. N. & Dantas, E. L., 1 Mar 2021, In: Geobiology. 19, 2, p. 125-146 22 p.

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15 Citations (Scopus)

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

Bauer, K. W., Bottini, C., Frei, R., 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.

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19 Citations (Scopus)

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

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7 Citations (Scopus)

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, R., Xu, L., Frederiksen, J. A. & Lehmann, B., 1 Mar 2021, In: Chemical Geology. 563, 20 p., 120061.

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31 Citations (Scopus)

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, R., Kristiansen, K., Frei, K. M. & Bondioli, L. (ed.), 2021, In: PLoS ONE. 16, 4, 35 p., e0250279.

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16 Citations (Scopus)

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

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

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21 Citations (Scopus)

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, R., 1 Jun 2021, In: Journal of South American Earth Sciences. 108, 26 p., 103176.

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

4 Citations (Scopus)

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

Gaucher, C., Frei, R., 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

17 Citations (Scopus)

Variations of cadmium concentrations and cadmium isotopes in Mytilus from North Atlantic and Baltic Sea

Frederiksen, J. A. & Frei, R., 2021. 1 p.

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2020

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, R., Kristiansen, K. & Frei, K. M., 2020, In: Science of the Total Environment. 708, 134714.

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

33 Citations (Scopus)

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

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

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

10 Citations (Scopus)

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-F., Huang, F. & Frei, R., 20 May 2020, In: Chemical Geology. 541, 119570.

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

45 Citations (Scopus)

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, R., Otero, N., Soler, A. & Ayora, C., 2020, In: Science of the Total Environment. 699, 11 p., 134331.

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15 Citations (Scopus)

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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, R., 2020, In: Geochimica et Cosmochimica Acta. 270, p. 338-359 22 p.

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28 Citations (Scopus)

Robert Frei

Research output

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