Search Results - "Guéguen, Bleuenn"

Paleoenvironmental variations during the Late Cambrian: Implications from Zn isotopes, I/(Ca+Mg) ratios, and other elemental proxies by González Robacio, Luisa, Azmy, Karem, Guéguen, Bleuenn, Claret, Francis

“…The Upper Cambrian at the Martin Point section (∼110 m-thick) in western Newfoundland is a part of the Cow Head Group and partially spans the coeval Tuckers…”
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Mn-micronodules from the sediments of the Clarion-Clipperton zone (Pacific Ocean): Origin, elemental source, and Fe-Cu-Zn-isotope composition by Dekov, Vesselin M., Rouxel, Olivier, Guéguen, Bleuenn, Wegorzewski, Anna V., Khripounoff, Alexis, Menot, Lénaïck

“…Mn- micronodules and nodules of the Clarion-Clipperton zone (Pacific Ocean) are composed of 10 Å and 7 Å phyllomanganates, and δ-MnO2. The Mn-micronodules are…”
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Redox changes in a seafloor hydrothermal system recorded in hematite-chalcopyrite chimneys by Dekov, Vesselin M., Garbe-Schönberg, Dieter, Kamenov, George D., Guéguen, Bleuenn, Bayon, Germain, Bindi, Luca, Asael, Dan, Fouquet, Yves

“…Hydrothermal chimneys composed of hematite and chalcopyrite grow at the Irina II vent site (Logatchev hydrothermal field, Mid-Atlantic Ridge). Hematite and…”
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Nickel isotopes and rare earth elements systematics in marine hydrogenetic and hydrothermal ferromanganese deposits by Gueguen, Bleuenn, Rouxel, Olivier, Fouquet, Yves

“…Attention is now being given to Ni isotope systematics in hydrogenetic marine ferromanganese (Fe-Mn) crusts as paleoceanographic proxies. Previous work focused…”
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Compound-specific recording of gadolinium pollution in coastal waters by great scallops by Le Goff, Samuel, Barrat, Jean-Alix, Chauvaud, Laurent, Paulet, Yves-Marie, Gueguen, Bleuenn, Ben Salem, Douraied

“…Gadolinium-based contrast agents (GBCAs), routinely used in magnetic resonance imaging (MRI), end up directly in coastal seawaters where gadolinium…”
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Variable Ni isotope fractionation between Fe-oxyhydroxides and implications for the use of Ni isotopes as geochemical tracers by Gueguen, Bleuenn, Sorensen, Jeffry V., Lalonde, Stefan V., Peña, Jasquelin, Toner, Brandy M., Rouxel, Olivier

“…Nickel (Ni) isotopes have recently emerged as a new biogeochemical tracer in marine environments, but our understanding of the mechanisms of Ni isotope…”
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Nickel Isotope Variations in Terrestrial Silicate Rocks and Geological Reference Materials Measured by MC-ICP-MS by Gueguen, Bleuenn, Rouxel, Olivier, Ponzevera, Emmanuel, Bekker, Andrey, Fouquet, Yves

“…Although initial studies have demonstrated the applicability of Ni isotopes for cosmochemistry and as a potential biosignature, the Ni isotope composition of…”
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A new chemical separation procedure for the determination of rare earth elements and yttrium abundances in carbonates by ICP-MS by Barrat, Jean-Alix, Bayon, Germain, Wang, Xudong, Le Goff, Samuel, Rouget, Marie-Laure, Gueguen, Bleuenn, Ben Salem, Douraied

“…The determination of rare earth elements (REEs) and Y in carbonates can be complicated by low REE abundances and the presence of significant amounts of Ba…”
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Evidence for extremely rapid magma ocean crystallization and crust formation on Mars by Bouvier, Laura C., Costa, Maria M., Connelly, James N., Jensen, Ninna K., Wielandt, Daniel, Storey, Michael, Nemchin, Alexander A., Whitehouse, Martin J., Snape, Joshua F., Bellucci, Jeremy J., Moynier, Frédéric, Agranier, Arnaud, Gueguen, Bleuenn, Schönbächler, Maria, Bizzarro, Martin

“…The formation of a primordial crust is a critical step in the evolution of terrestrial planets but the timing of this process is poorly understood. The mineral…”
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Volatile element evolution of chondrules through time by Mahan, Brandon, Moynier, Frédéric, Siebert, Julien, Gueguen, Bleuenn, Agranier, Arnaud, Pringle, Emily A., Bollard, Jean, Connelly, James N., Bizzarro, Martin

“…Chondrites and their main components, chondrules, are our guides into the evolution of the Solar System. Investigating the history of chondrules, including…”
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The chromium isotope composition of reducing and oxic marine sediments by Gueguen, Bleuenn, Reinhard, Christopher T., Algeo, Thomas J., Peterson, Larry C., Nielsen, Sune G., Wang, Xiangli, Rowe, Harry, Planavsky, Noah J.

“…The chromium (Cr) isotope composition of marine sediments has the potential to provide new insights into the evolution of Earth-surface redox conditions. There…”
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Comparative geochemistry of four ferromanganese crusts from the Pacific Ocean and significance for the use of Ni isotopes as paleoceanographic tracers by Gueguen, Bleuenn, Rouxel, Olivier, Rouget, Marie-Laure, Bollinger, Claire, Ponzevera, Emmanuel, Germain, Yoan, Fouquet, Yves

“…Ferromanganese (Fe-Mn) crusts are potential archive of the Ni isotope composition of seawater through time. In this study we aim at (1) understanding Ni…”
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Iron mineral structure, reactivity, and isotopic composition in a South Pacific Gyre ferromanganese nodule over 4Ma by Marcus, Matthew A., Edwards, Katrina J., Gueguen, Bleuenn, Fakra, Sirine C., Horn, Gregory, Jelinski, Nicolas A., Rouxel, Olivier, Sorensen, Jeffry, Toner, Brandy M.

“…Deep-sea ferromanganese nodules accumulate trace elements from seawater and underlying sediment porewaters during the growth of concentric mineral layers over…”
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Trace element systematics in cold seep carbonates and associated lipid compounds by Wang, Xudong, Bayon, Germain, Kim, Jung-Hyun, Lee, Dong-Hun, Kim, Dahae, Guéguen, Bleuenn, Rouget, Marie-Laure, Barrat, Jean-Alix, Toffin, Laurent, Feng, Dong

“…Seeping of methane-rich fluids at submarine cold seeps drives intense microbial activity and precipitation of authigenic carbonates. Some trace elements play…”
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Iron mineral structure, reactivity, and isotopic composition in a South Pacific Gyre ferromanganese nodule over 4 Ma by Marcus, Matthew A., Edwards, Katrina J., Gueguen, Bleuenn, Fakra, Sirine C., Horn, Gregory, Jelinski, Nicolas A., Rouxel, Olivier, Sorensen, Jeffry, Toner, Brandy M.

“…Deep-sea ferromanganese nodules accumulate trace elements from seawater and underlying sediment porewaters during the growth of concentric mineral layers over…”
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Comparing orthomagmatic and hydrothermal mineralization models for komatiite-hosted nickel deposits in Zimbabwe using multiple-sulfur, iron, and nickel isotope data by Hofmann, Axel, Bekker, Andrey, Dirks, Paul, Gueguen, Bleuenn, Rumble, Doug, Rouxel, Olivier J.

“…Trojan and Shangani mines are low-grade (<0.8 % Ni), komatiite-hosted nickel sulfide deposits associated with ca. 2.7 Ga volcano-sedimentary sequences of the…”
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The Behavior of Rare Earth Elements during Green Clay Authigenesis on the Congo Continental Shelf by Germain Bayon, Pierre Giresse, Hongjin Chen, Marie-Laure Rouget, Bleuenn Gueguen, Gabriel Ribeiro Moizinho, Jean-Alix Barrat, Daniel Beaufort

“…Clay mineral authigenesis at continental margins plays an important role in global marine element cycles. However, despite being increasingly used as tracers…”
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Can selenium‐enriched spirulina supplementation ameliorate sepsis outcomes in selenium‐deficient animals? by Castel, Thomas, Theron, Michaël, Pichavant‐Rafini, Karine, Guernec, Anthony, Joublin‐Delavat, Aurélie, Gueguen, Bleuenn, Leon, Karelle

“…In intensive care units, sepsis is the first cause of death. In this pathology, inflammation and oxidative status play a crucial role in patient outcomes…”
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The Nickel isotope composition of the authigenic sink and the diagenetic flux in modern oceans by Gueguen, Bleuenn, Rouxel, Olivier

“…We investigated Ni isotopes in a stratigraphic sequence of pelagic clays collected during ODP core leg 185 on site 1149 in Western Pacific Ocean near the…”
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Light Zn and Cu isotope compositions recorded in ferromanganese crusts during the Cenozoic as evidence for hydrothermal inputs in South Pacific deep seawater by Gueguen, Bleuenn, Rouxel, Olivier, Fouquet, Yves

“…This study presents a high-resolution record of Cu and Zn isotopes in four Fe-Mn crusts from the North and South Pacific oceans. North Pacific crusts were…”
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