All abstracts by Robert Frei in conference series: Goldschmidt

(2023) Corg, N and Hg-Isotopes and Hg Chemostratigraphy in the Late Ordovician–early Silurian Transition, Argentine Precordillera
Sial AN, Chen J, Peralta S, Gaucher C, Korte C, Frei R, Ferreira VP, Lacerda LD, Barbosa JA, Pereira N, Riedel PR & Gomez JC

(2023) Combined Cadmium-Chromium Analyses of the Cretaceous-Paleogene Belqa Group, Central Jordan
Walker SR, Cuney M, Baioumy H, Farouk S, Lehmann B & Frei R

(2023) Severe Changes in the Marine Environment Across the Cretaceous—Paleogene Boundary in the Danish Basin: Constraints from the Combined Cd-Cr Isotope System
Frederiksen JA, Thibault N, Gilleaudeau G, Bjerrum CJ & Frei R

(2022) Neoproterozoic Glaciations and their Tally on Seawater Evolution: Stable C, O and Cr Paired with Radiogenic Nd, Sr Isotope-Stratigraphy of the Witvlei Group (Namibia)
Hohl SV, Rodler A, Viehmann S, Gaucher C, Germs G, Goderis S, Frei R & Huang X

(2022) The Provenance of Copper of Egyptian Blue Pigments: A Sarcophagus from Sidon
Rodler A, Brøns C, Tepe N, Hofmann T, Koeberl C, Frei R & Artioli G

(2021) Why We Need Extensive, Regional, Bioavailable Sr Isotope Baselines for Human Mobility Studies in Archaeology: A Case from the Peloponnese
Frank AB, Frei R, Triantaphyllou M, Vassilakis E, Kristiansen K & Frei KM

(2021) Chromium Isotopes as a Proxy for Redox Conditions on Early Earth: Insights from Australian Sedimentary Rock Records
Farkas J, Klaebe R, Stromberg J, Spinks S, Toledo G, Liebelt S, Blades M, Collins A & Frei R

(2021) Variations of Cadmium Concentrations and Cadmium Isotopes in Mytilus from North Atlantic and Baltic Sea
Frederiksen JA & Frei R

(2020) Fractionated Cr Isotopes in the Late Paleoprotorozoic Marine Carbonates from the McArthur Basin, Australia: A Record of Oxic Paleo-Seawater or a Later Diagenetic Fluid-Flow Event?
Farkas J, Klaebe R, Collins A, Toledo G, Frei R, Lohr S, Murray S, Cox G, Blades M & Subarkah D

(2020) Redox and Nutrient Fluctuations in Interglacial Neoproterozoic Witvlei Group Carbonates (Namibia) Argue for Ecosystem Instability Promoting Animal Evolution
Hohl SV, Rodler A, Gaucher C & Frei R

(2020) Stable Cr Isotope Systematics of Carbonatites from the East African Rift
Frei R, Magna T & Rapprich V

(2019) The Utility of Modern Microbialites for Recording Environmental Conditions
Bruggmann S, Rodler A, Klaebe R & Frei R

(2019) Archean and Early Phanerozoic Serpentinization Environments – Insights from Chromium Isotope and REY Systematics of Stichtites (Mg6Cr2(OH)16[CO₃]·4H₂O)
Kraemer D, Melchiorre E, Frei R & Bau M

(2019) Chromium Isotope Constraints on the Late Paleoproterozoic Marine Redox: Evidence from ~1.64 Ga Carbonates of the Greater McArthur Basin, Australia
Farkas J, Toledo G, Klaebe R, Frei R, Collins A, Cox G, Blades M, Bullen M, Guiliano W, Samanta M, Edgoose C & Smith B

(2019) Cryogenian‒Ediacaran Carbonates and BIF Chemostratigraphy, Cachoeirinha Group, Northeastern Brazil
Usma C, Sial A, Gaucher C, Frei R & Ferreira V

(2019) The Origin of Banding in BIFs: II. Cr Isotopes and Th/U in the Neoarchean Temagami IF, Canada
Bau M, Frei R, Garbe-Schoenberg D & Viehmann S

(2019) Neoproterozoic Environmental Conditions: A Novel Metal Stable Isotope Perspective
Rodler A, Hohl S, Gaucher C, Germs G, Hegenberger W, Goderis S, Claeys P & Frei R

(2019) Oxidative Weathering in the Late Neoproterozoic: Cr-Isotopes in the Banda Alta Fm. Iron Deposit, Brazil
Árting TB & Frei R

(2018) Fingerprinting the Origin of Soapstone/Steatite from the Nuuk-Region (Southern West-Greenland)
Poulsen MD, Keulen N & Frei R

(2018) Controls on Element Exchange in Ultramafic-Hosted Plumasite-Type Corundum, South-East Greenland
Poulsen MD, Keulen N, van Hinsberg VJ, Kolb J, Frei R, Wennemann T & Thomsen TB

(2018) Cr Isotope Fractionation during Sorption on Kaolinite and its Implications for Using Black Shales as a Paleoredox Archive
Frank AB, Klaebe RM & Frei R

(2017) Deciphering the Carbonate Record of Mesoproterozoic Biospheric Oxygenation: Insights from Chromium and Uranium Isotopes
Gilleaudeau G, Frei R, Kaufman A, Luo G, Romaniello S, Zhang F, Klaebe R, Sahoo S, Kah L, Azmy K, Bartley J, Chernyavskiy P, Knoll A & Anbar A

(2017) Carbon Stable Isotope Record in the Coral Species Siderastrea Stellata: A Link to the Suess Effect in Tropical South Atlantic Ocean
Pereira N, Sial A, Shen C-C, Liu S-C, Kikuchi R, Braga B, Frei R, Ullmann C, Korte C, Ferreira V & Kilbourne K

(2017) Impact vs Volcanism in the Cretaceous–Paleogene Boundary: Insights from Hg Chemostratigraphy and Hg Isotopes
Sial A, Chen J, Lacerda LD, Tewari V, Gaucher C, Frei R, Korte C, Cirilli S, Ferreira V, Barbosa JA & Pereira N

(2017) Chromium Isotope Cycling Across the Peruvian Oxygen Minimum Zone
Bruggmann S, Scholz F, Klaebe R & Frei R

(2017) The Chromium Isotopic Composition of Organic-Rich Marine Sediments as a Potential Paleoredox Archive
Frank AB, Klaebe RM & Frei R

(2017) Chromium Isotope Heterogeneity on a Modern Carbonate Platform: Implications for an Emerging Paleo-Redox Proxy
Klaebe R, Swart P & Frei R

(2017) Early Cryogenian Cr Isotope Stratigraphy, Otavi Group, Namibia
Rodler AS, Frei R, Korte C, Gaucher C & Germs GJB

(2016) Unraveling the Evolution of Atmosphere Oxygenation from Ediacaran to Early Cambrian, Evidenced from Cr Isotope
Wei W, Ling H, Frei R, Li D, Gilleaudeau G & Wei G

(2016) Extensive Oxidative Weathering Following a Late Neoproterozoic Glaciation – Evidence from Trace Element and Chromium Isotope Records in the Moro do Urucum and Puga Iron Formation (Mato Grosso do Sul, Brazil)
Frei R, Døssing LN, Gaucher C, Boggiani P & Crowe SA

(2016) The Impact of the Biogenic Siderophore Desferrioxamine B on Cr Oxidation and Fractionation of Cr Isotopes
Kraemer D, Viehmann S, Frei R & Bau M

(2016) Oceanographic Change in the Late Cretaceous Chalk Sea (Denmark): Clues from Chromium Isotopes
Gilleaudeau G, Voegelin A, Thibault N, Moreau J, Ullmann C, Korte C & Frei R

(2015) Geochemistry of the Belemnite Rostrum: Genesis and Diagenesis
Ullmann CV, Frei R, Korte C & Hesselbo SP

(2015) Hg Chemostratigraphy and Hg Isotopes from Sections Straddling the KTB in Europe, India and South America
Sial AN, Jiubin C, Lacerda LD, Tewari VC, Pandit MK, Gaucher C, Frei R, Cirilli S, Ferreira VP, Peralta S, Barbosa JA & Pereira NS

(2015) Chromium Isotope Fractionation during Coprecipitation with Calcium Carbonate
Rodler A, Sánchez-Pastor N, Fernández-Díaz L & Frei R

(2015) The Chromium Isotopic Composition of an Early to Middle Ordovician Marine Carbonate Platform, Eastern Precordillera, San Juan, Argentina
D'Arcy J, Frei R, Gilleaudeau G, Peralta S, Kah L & Gaucher C

(2015) Early Cambrian Black Shale-Hosted Mo-Ni and V Mineralization on the Rifted Margin of the Yangtze Platform, China: Reconnaissance Chromium Isotope Data
Lehmann B, Frei R, Xu L & Mao J

(2015) Chromium Isotopes in Carbonates Constrain Mesoproterozoic Atmospheric pO₂ Levels
Gilleaudeau GJ, Frei R, Kaufman AJ, Kah LC, Azmy K, Bartley JK & Knoll AH

(2015) Chromium-Isotope Signatures in Corals from the Rocas Atoll, Tropical South Atlantic
Pereira NS, Voegelin A, Paulukat C, Sial AN, Ferreira VP & Frei R

(2015) Global Cr-Isotope Distributions in Surface Seawater and Incorporation of Cr Isotopes into Carbonate Shells
Paulukat C, Frei R, Voegelin AR & Samankassou E

(2014) Algoma-Type Neoproterozoic BIFs and Related Marbles in the Seridó Belt (NE Brazil): REE, C, O, Cr and Sr Isotope Evidence
Sial AN, Campos MS, Gaucher C, Frei R, Ferreira VP, Nascimento RC, Pimentel MM & Pereira NS

(2014) C-, Hg-Stratigraphies, Hg Isotopes and Volcanic Activity during Extreme Environmental Turnover: The Cretaceous-Paleogene Transition in Italy, Denmark and Argentina
Sial AN, Chen J, Lacerda LD, Peralta S, Gaucher C, Frei R, Cirilli S, Barbosa AJ, Ferreira VP & Pereira NS

(2014) The Behaviour of Chromium Isotopes during the Oxidative Weathering of Ultramafic Rocks
Paulukat C, Døssing LN, Mondal SK & Frei R

(2014) Chromium Isotope Fractionation during Oxidative Weathering of a Modern Basaltic Weathering Profile
D'Arcy J, Døssing L & Frei R

(2013) Isotopic Signature of Naturally Cr(VI) Contaminated Spring Waters from Western Tuscany (Italy)
Chiarantini L, Agostini S, Baneschi I, Guidi M, Natali C, Tonarini S & Frei R

(2013) Oxygenic Photosynthesis 3 Billion Years ago
Crowe SA, Døssing LN, Beukes NJ, Bau M, Kruger SJ, Frei R & Canfield DE

(2013) Large Igneous Province Volcanism, Ocean Anoxia and Marine Mass Extinction
Ruhl M, Bjerrum CJ, Canfield DE, Korte C, Stemmerik L & Frei R

(2013) Hg as a Proxy for Volcanic Activity during Extreme Environmental Turnover: The K-T Boundary
Sial AN, Lacerda LD, Ferreira VP, Frei R, Marquillas RA, Barbosa JA, Gaucher C, Windmöller CC & Pereira NS

(2013) C-, Cr-, Sr-Isotope Stratigraphies and Rare-Earth Elements in Carbonate and BIFs of the Neoproterozoic Jucurutu Formation, Seridó Belt, NE Brazil
Campos MS, Sial AN, Gaucher C, Frei R, Ferreira VP, Nascimento RSC, Pimentel MM & Pereira NS

(2013) Diagenesis Affects Carbonate δ⁵³Cr: Evidence from the K-Pg Boundary Section at Stevns Klint (Denmark)
Voegelin AR, Frei R, Thibault N, Ullmann CV & Korte C

(2013) Chromium Isotope Record of the Otavi Group, Namibia
Rodler A, Frei R, Gaucher C, Voegelin A, Ullmann CV & Korte C

(2013) Preservation Potential of δ⁷Li Values in Mesozoic Calcite Fossils
Ullmann CV, Campbell HJ, Frei R, Hesselbo SP, Pogge von Strandmann PAE & Korte C

(2012) Chromium Isotopes as Proxy for Surface Oxygenation – Results from a ~1.9 Ga Paleosol Developed on Oceanic Crust (Schreiber Beach, Ontario, Canada)
Frei R & Polat A

(2012) Chromium Isotope Fractionation during Mobilization and Transport in Sukinda Valley, India
Doessing LN, Dideriksen K, Crowe SA, Mondal SK, Bovet N & Frei R

(2012) The Early Paleozoic of the Argentine Precordillera: C-Isotope Excursions
Sial A, Peralta S, Gaucher C, Toselli A, Ferreira V, Frei R & Pimentel M

(2012) Mercury as a Proxy for Volcanogenic CO₂ Buildup in Neoproterozoic Snowball Earth and Volcanism in the K-T Transition
Ferreira V, Sial A, Lacerda LD, Frei R, Gaucher C & Marquillas R

(2011) Cr-Isotopes and REE Variations in a Laterite Profile: Implication for Redox Processes and Element Mobility during Weathering
Berger A & Frei R

(2011) Oxidative Weathering Fractionates Chromium Isotopes
Crowe S, Døssing L, MacLean L, Frei R, Fowle D, Mucci A & Canfield D

(2011) Cadmium Isotopes in Banded Iron Formations and Early Life in the Precambrian Ocean
Abouchami W, Mezger K, Galer S & Frei R

(2011) A Novel Proxy Links CAMP Volcanism with End-Triassic Mass Extinction and Early Jurassic Evolution
Ruhl M, Bjerrum C, Frei R & Korte C

(2011) C, Sr Isotopes in Cap Carbonate and and Ce Anomaly in BIFs of Jucurutu Formation, Seridó Belt, NE, Brazil
Campos M, Sial A, Gaucher C, Ferreira V, Frei R, Nascimento R & Pimentel M

(2010) Geodynamic Evolution of the Mesoarchean Fiskenæsset Anorthosite Complex, SW Greenland
Polat A, Frei R & Schersten A

(2009) Geochemistry of Mesoarchean Sukinda Chromite Deposits (India): Implications for Gabbro-Breccia Hosted PGE Mineralization
Khatun S, Mondal SK, Balaram V, Rosing MT & Frei R

(2009) Do δ⁹⁸Mo Values in Marine Euxinic Sediments Reflect Seawater?
Dahl TW, Anbar A, Gordon G, Rosing MT, Frei RE & Canfield DE

(2008) Molybdenum Isotope Variations in a Redox-Stratified Lake; Removal Mechanism and Preservation in Euxinic Sediments
Dahl TW, Anbar AD, Gordon GW, Rosing MT, Frei RE & Canfield DE

(2008) Chromium Isotopes in the Marine Environment Through Time – A Suitable Paleoredox Tracer?
Frei R & Gaucher C

(2007) Petrogenesis of Delihalil Quaternary Basaltic Volcanism, South Anatolia, Turkey
Temel A, Frei R, Alpaslan M & Kurt MA

(2007) Geochemical Characteristics of the Quaternary Volcanic Rocks from Hatay Region, Southern Turkey: Evidence for Lithospheric Mantle Source
Varol E, Frei R, Alpaslan M, Kurt MA & Temel A

(2007) Earth's Oldest BIFs (Isua, W Greenland) – Constraints from Ge/Si Ratios, REE Systematics and Sm-Nd and Pb Isotopes for Different Interacting Water Masses during their Formation
Frei R & Polat A

(2007) Plagiogranitic Ocelli in the Pillow Lavas of the Eoarchean (3.7-3.8 Ga) Isua Greenstone Belt, SW Greenland
Polat A, Appel PWU & Frei R

(2007) Trace Element and Isotopic Characterization of Neoarchean – Paleoproterozoic BIFs (Black Hills, South Dakota, USA) Straddling the First Rise of Atmospheric Oxygen between 2.4 and 2.0 Ga
Frei R & Dahl P

(2007) Mo Isotope Variations in Meromictic Lake Cadagno
Dahl TW, Anbar AD, Gordon GW, Frei R & Canfield DE

(2006) Nd isotope and Trace Element Characteristics of the Mesoarchean (3075 Ma) Ivisaartoq Greenstone Belt, SW Greenland: Evidence for Two Distinct Subarc Mantle Sources
Polat A, Frei R & Dilek Y

(2004) Nd and Pb Isotopes of Mn/Fe Precipitates of the Baltic Sea: Climate Change Versus Pollution
Bock B, Liebetrau V, Eisenhauer A, Frei R, Kronz A & Leipe T

(2004) Origin of the Ultrapotassic Volcanics within the Late Cretaceous to Early Tertiary Ulukışla Basin, Central Anatolia, Turkey
Alpaslan M, Frei R, Kurt M, Temel A & Boztu D

(2004) The Hadean Upper Mantle Conundrum: Evidence for Source Depletion and Enrichment in 3.71 Gy Boninite-Like Metabasalts (Isua, W Greenland)
Frei R, Polat A & Meibom A

(2003) Search for Extraterrestrial Components in ~3.8 Ga Metamorphosed Sediments from the Isua Supracrustal Belt (W Greenland) – No Evidence from Cr Isotopes so Far
Frei R, Schoenberg R & Rosing M

(2002) Pb- and Nd-Isotope Records of Baltic Mn/Fe-Precipitates: Evidence for Anthropogenic Pollution and Temporal Variation of Circum Baltic Weathering during the Little Ice Age
Liebetrau V, Eisenhauer A, Frei R, Bock B, Kronz A & Hansen BT

(2002) Os Isotopes, Deep-Rooted Mantle Plumes and the Timing of Inner Core Formation
Meibom A, Frei R, Chamberlain CP, Coleman RG, Hren MT & Sleep NH

(2002) Re-Os, Sm-Nd Isotope- and REE Systematics on Komatiites and Pillow Basalts from the Earth’s Oldest Oceanic Crustal Fragments (Isua Supracrustal Belt, W Greenland)
Frei R & Karstbjerg Jensen B

(2002) The Closure Temperature of the Lu-Hf Isotopic System in Apatite
Barfod GH, Robert F & Eirik Jens K

(2002) >3700 Ma Oxidized Ocean Water, Pb Isotopic Evidence from Isua, West Greenland
Rosing MT & Frei R

(2001) Complex Sm-Nd and Lu-Hf Isotope Systematics of Metamorphic-Metasomatic Garnets from the Earth's Oldest Oceanic Crustal Sequence (Isua Supracrustal Belt, West Greenland)
Frei R & Blichert-Toft J

(2001) Enriched Alkaline Lavas within a Depleted Picrite Succession: Melting of Old Lithosphere Induced by Passing Asthenospheric Melts, Paleocene of West Greenland
Larsen LM, Pedersen AK, Sundvoll B & Frei R

(2000) Dating of Phosphatic Material by the Lu-Hf Isotopic System
Barfod GH, Albarede F & Frei R

(2000) Getting out of the Extreme: Possible Indications of Pre-3700 Ma Oxygenic Photosynthesis from Isua, West Greenland
Rosing M & Frei R