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Y. Kebukawa, M. Zolensly, J. Mathurin, E. Dartois, C. Engrand, J. Duprat, A. Deniset-Besseau, A. Dazzi, M. Fries, T. Ohigashi, D. Wakabayashi, S. Yamashita, Y. Takeichi, Y. Takahashi, M. Kondo, M. Ito, Y. Kodama, Z. Rahman, K. Kobayashi |
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Title |
Organic matter in the Aguas Zarcas (CM2) meteorite: high abundance of aliphatic carbon in metal-rich lithology |
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Peer-reviewed symposium |
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Year |
2020 |
Publication |
Lunar and Planetary Science Conference, id 1349 |
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51 |
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1614 |
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1120 |
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7911 |
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Y. Kakazu, C. Engrand, J. Duprat, G. Briani, N. Bardin, S. Mostefaoui, R. Duhamel and L. Rémusat. |
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Title |
Bulk oxygen isotopic composition of ultra-carbonaceous antarctic micrometeorites with the Nanosims |
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Conference - International - Poster |
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2014 |
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77th Annual Meeting of the Meteoritical Society |
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1120 |
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Bachelor's thesis |
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yes |
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5265 |
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Author |
Y. Amini. |
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Title |
Marégraphe et bouée GPS en Antarctique. |
Type |
Master 1 |
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Year |
2014 |
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688 |
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6802 |
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Xueref I. & Dominé F. |
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Title |
FTIR spectroscopic studies of the simultaneous condensation of HCl and H2O at 190 K – Atmospheric applications. |
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Journal Article |
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Year |
2003 |
Publication |
Atmospheric chemistry and physics |
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3 |
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1779-1789 |
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437 |
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1680-7316 |
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yes |
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3147 |
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Author |
Xu, G.; Frey, F.A.; Weis, D.; Scoates, J.S.; Giret, A. |
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Title |
Flood basalts from Mt. Capitole in the central Kerguelen Archipelago: Insights into the growth of the archipelago and source components contributing to plume-related volcanism |
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Journal Article |
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Year |
2007 |
Publication |
Geochem. Geophys. Geosyst. |
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8 |
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Keywords |
Kerguelen mantle plume; Kerguelen Archipelago; Mt. Capitole; lower continental crust; Sr; Nd; Hf; Pb isotopic ratios; 1037 Geochemistry: Magma genesis and partial melting; 1038 Geochemistry: Mantle processes; 1065 Geochemistry: Major and trace element geochemistry |
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Abstract |
The Kerguelen Archipelago, constructed on the submarine Northern Kerguelen Plateau, is attributed to Cenozoic volcanism arising from the Kerguelen hot spot. Geochemical studies of 325 to 1000 m thick lava sections of the ?30 to 25 Ma flood basalt forming the bulk of the archipelago show a temporal change from older tholeiitic basalt to younger slightly alkalic basalt. This compositional transition is expressed in a 630 m lava section at Mt. Capitole where the lava sequence is lowermost tholeiitic basalt overlain by slightly alkalic basalt overlain by plagioclase-rich cumulates that are mixtures of plagioclase-phyric basalt and more evolved magmas. During growth of the archipelago, magma supply from the hot spot was variable and at times sufficiently low to enable extensive crystal fractionation; e.g., at Mt. Capitole and nearby Mt. Tourmente only 10 of 120 lava flows have >6 wt% MgO. On the basis of this study and previous isotopic data for the ?34 Ma submarine lavas erupted on the Northern Kerguelen Plateau, other flood basalt sections in the Kerguelen Archipelago, and younger lavas erupted in the archipelago and at Heard Island, there is significant Sr, Nd, Hf, and Pb isotopic heterogeneity that can be explained by two stages of mixing. The first mixing event, best shown by the submarine lavas, is between components that are related to Indian Ocean mid-ocean ridge basalt (MORB) and the Kerguelen hot spot. From ?34 Ma to <1 Ma, on average the proportion of the MORB-related component decreased. Subsequently, a second mixing process involved addition of a component with relatively high 87Sr/86Sr (>0.7060) and low 143Nd/144Nd (<0.5125) and 176Hf/177Hf (<0.2827) and nonradiogenic Pb isotope ratios (<17.9 for 206Pb/204Pb). We infer that this component was lower continental crust. |
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Programme |
444 |
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Bachelor's thesis |
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Publisher |
American Geophysical Union |
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ISSN |
1525-2027 |
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yes |
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Call Number |
IPEV @ Thierry.Lemaire @ |
Serial |
5532 |
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Author |
Xu Y., Feller G., Gerday C. & Glansdorff N. |
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Title |
Metabolic enzymes from psychrophilic bacteria: challenge of adaptation to low temeratures in ornithine carbamoyltransferase from Mortinella abyssi. |
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Journal Article |
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Year |
2003 |
Publication |
Journal of bacteriology |
Abbreviated Journal |
J. Bacteriol. |
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Volume |
185 |
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2161-2168 |
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193 |
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0021-9193 |
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yes |
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Serial |
2383 |
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Author |
Xu Y., Feller G., Gerday C. & Glansdorff N. |
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Title |
Cold-active dihydrofolate reductase: Are there naturals limits to optimization of catalytic efficiency at low temperature? |
Type |
Journal Article |
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Year |
2003 |
Publication |
Journal of bacteriology |
Abbreviated Journal |
J. Bacteriol. |
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Volume |
18 |
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5519-5526 |
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193 |
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0021-9193 |
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yes |
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2499 |
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Author |
Xing Xiaogang, Claustre Hervé, Blain Stéphane, D'Ortenzio Fabrizio, Antoine David, Ras Josephine, Guinet Christophe, |
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Title |
Quenching correction for in vivo chlorophyll fluorescence acquired by autonomous platforms: a case study with instrumented elephant seals in the Kerguelen region (Southern Ocean)
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Journal Article |
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2012 |
Publication |
Limnology and Oceanography: Methods |
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10 |
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483-495 |
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As the proxy for Chlorophyll a (Chl a) concentration, thousands of fluorescence profiles were measured by instrumented elephant seals in the Kerguelen region (Southern Ocean). For accurate retrieval of Chl a concentrations acquired by in vivo fluorometer, a two-step procedure is applied: 1) A predeployment intercalibration with accurate determination by high performance liquid chromatography (HPLC) analysis, which not only calibrates fluorescence in appropriate Chl a concentration units, but also strongly reduces variability between fluorometers, and 2) a profile-by-profile quenching correction analysis, which effectively eliminates the fluorescence quenching issue at surface around noon, and results in consistent profiles between day and night. The quenching correction is conducted through an extrapolation of the deep fluorescence value toward surface. As proved by a validation procedure in the Western Mediterranean Sea, the correction method is practical and relatively reliable when there is no credible reference, especially for deep mixed waters, as in the Southern Ocean. Even in the shallow mixed waters, the method is also effective in reducing the influence of quenching.
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109 |
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1541-5856 |
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yes |
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3905 |
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Author |
Xiao Gang Hu |
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Title |
Observations of the azimuthal dependence of normal mode coupling below 4mHz at the South Pole and its nearby stations: Insights into the anisotropy beneath the Transantarctic Mountains |
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Journal |
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Year |
2016 |
Publication |
Physics of the Earth and Planetary Interiors |
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257 |
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57-78 |
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Anisotropy Normal-mode coupling Quasi-Love wave Shear-wave splitting South Pole Transantarctic Mountains |
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Normal mode coupling pair 0S26–0T26 and 0S27–0T27 are significantly present at the South Pole station QSPA after the 2011/03/11 Mw9.1 Tohoku earthquake. In an attempt to determine the mechanisms responsible for the coupling pairs, I first investigate mode observations at 43 stations distributed along the polar great-circle path for the earthquake and observations at 32 Antarctic stations. I rule out the effect of Earth’s rotation as well as the effect of global large-scale lateral heterogeneity, but argue instead for the effect of small-scale local azimuthal anisotropy in a depth extent about 300km. The presence of quasi-Love waveform in 2–5mHz at QSPA and its nearby stations confirms the predication. Secondly, I analyze normal mode observations at the South Pole location after 28 large earthquakes from 1998 to 2015. The result indicates that the presence of the mode coupling is azimuthal dependent, which is related to event azimuths in −46° to −18°. I also make a comparison between the shear-wave splitting measurements of previous studies and the mode coupling observations of this study, suggesting that their difference can be explained by a case that the anisotropy responsible for the mode coupling is not just below the South Pole location but located below region close to the Transantarctic Mountains (TAM). Furthermore, more signals of local azimuthal anisotropy in normal-mode observations at QSPA and SBA, such as coupling of 0S12-0T11 and vertical polarization anomaly for 0T10, confirms the existence of deep anisotropy close to TAM, which may be caused by asthenospheric mantle flow and edge convection around cratonic keel of TAM. |
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133 |
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0031-9201 |
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0031-9201 |
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6771 |
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Author |
Xavier Meyer |
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Title |
Programme IPEV 1091 “l’AMMER” : les manchots adélie comme bioplateformes de l’environnement |
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Peer-reviewed symposium |
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Year |
2015 |
Publication |
European Science Foundation |
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1091 |
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8707 |
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