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Author |
Bascou J, Delpech G, Vauchez A, Moine B N, Cottin J Y, Barruol G, |
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Title  |
An integrated study of microstructural, geochemical, and seismic properties of the lithospheric mantle above the Kerguelen plume (Indian Ocean)
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Type |
Journal Article |
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Year |
2008 |
Publication |
Geochem. Geophys. Geosyst. |
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Volume |
9 |
Issue |
4 |
Pages |
Q04036- |
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Keywords |
Kerguelen, mantle plume, seismic anisotropy, metasomatism, crystallographic fabric, lithosphere, 8121 Tectonophysics: Dynamics: convection currents, and mantle plumes, 8030 Structural Geology: Microstructures, 7208 Seismology: Mantle, |
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Abstract |
Peridotite xenoliths brought up to the surface by the volcanism of the Kerguelen Islands represent a mantle that has been affected by a high degree of partial melting followed by intense melt percolation above the Kerguelen plume. These xenoliths are therefore particularly suitable to investigate effects of melt-rock interaction on crystallographic fabrics (lattice-preferred orientation (LPO)) of peridotite minerals and on the LPO-induced seismic properties of peridotites above a mantle plume. We have studied a suite of 16 ultramafic samples representative of different degrees of partial melting and magma-rock interaction among which the protogranular harzburgites are the least metasomatised xenoliths and dunites are the ultimate stage of metasomatism. Olivine LPO is characterized by high concentration of [010] axes perpendicular to the foliation and [100] axes close to the lineation or distributed in the foliation plane in harzburgites, whereas the high concentration of [100] axes is parallel to the lineation and [010] axes is perpendicular to the assumed foliation in dunites. Olivine LPO in harzburgites is interpreted as being due to a deformation regime in axial compression or transpression. The fabric strength of olivine decreases progressively from protogranular to poikilitic harzburgites and finally to dunites, for which it remains nevertheless significant (J index $\geq$ 3.8). Seismic properties calculated from LPO of minerals indicate that metasomatism at higher melt/rock ratio lowers the P wave velocities. The most significant difference between harzburgites and dunites corresponds to the distribution of S wave anisotropy. Harzburgites display the maximum of anisotropy within the foliation plane and the minimum of anisotropy perpendicular to the foliation plane, whereas the lowest anisotropy is parallel to the lineation for dunites. These modifications of seismic properties as a result of metasomatic processes may induce seismic heterogeneities in the mantle above the Kerguelen plume. In addition, assuming a lithospheric mantle primarily harzburgitic and structured with a horizontal foliation, the seismic properties calculated for the Kerguelen xenoliths reconcile the rather high anisotropy evidenced by the horizontally propagating surface waves with the apparent isotropy revealed by the absence of splitting of vertically propagating teleseismic SKS waves recorded by the GEOSCOPE Kerguelen station.
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133;444 |
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Bachelor's thesis |
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AGU |
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1525-2027 |
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2814 |
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An integrative appraisal of the hormonal and metabolic changes induced by acute stress using king penguins as a model |
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2017 |
Publication |
General and Comparative Endocrinology |
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Allostasis Cortisol Homeostasis Metabolism Reactive scope Seabird |
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119 |
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0016-6480 |
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0016-6480 |
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6796 |
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An integrative appraisal of the hormonal and metabolic changes induced by acute stress using king penguins as a model |
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2018 |
Publication |
General and Comparative Endocrinology |
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269 |
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1-10 |
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Keywords |
Allostasis Cortisol Homeostasis Metabolism Reactive scope Seabird |
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119 |
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0016-6480 |
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0016-6480 |
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yes |
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7375 |
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Title |
An intercomparison campaign of ground-based UV-visible measurements of NO2, BrO, and OClO slant columns. Methods of analysis and results for NO2 |
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Journal Article |
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Year |
2005 |
Publication |
Journal of geophysical research-atmospheres |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
110 |
Issue |
d8 |
Pages |
D08305 |
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904 |
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ISSN |
0148-0227 |
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yes |
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Call Number |
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3228 |
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Author |
Vaughan G., Roscoe H.K., Bartlett L.M., O'Connor F.M., Sarkissian A., Van Roozendael M., Lambert J.C., Simon P.C., Karlsen, K. Kaastad Hoiskar B.A., Fish D.J., Jones R.L., Freshwater R., Pommereau J.P. et al. |
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Title |
An intercomparison of ground-based UV- visible sensors of Ozone and NO2. |
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Journal Article |
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Year |
1997 |
Publication |
Journal of geophysical research-atmospheres |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
1 |
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Pages |
1411-1422 |
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209 |
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0148-0227 |
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yes |
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159 |
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Title |
An international intercomparison of marine atmospheric radon 222 in Bermuda. |
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Journal Article |
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Year |
1995 |
Publication |
Journal of geophysical research-atmospheres |
Abbreviated Journal |
J. Geophys. Res. |
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100 |
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16617-16638 |
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146 |
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Bachelor's thesis |
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0148-0227 |
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yes |
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2022 |
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Author |
Priscu J.C., Bell R.E., Bulat S.A., Ellis Evans C., Lukin V.V., Petit J.R., Powell R.D., Siegert M.J. & Tabacco I. |
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Title |
An International Plan for Antarctic Subglacial Lake Exploration. |
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Journal Article |
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2003 |
Publication |
Poloar geography |
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27 |
Issue |
1 |
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48-62 |
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355 |
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yes |
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Call Number |
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2608 |
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Author |
Laparie M., Debat V., Vernon P., Cozic Y., Frenot Y. & Renault D. |
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Title |
An invasive fully-winged fly in a world ruled by flightless insects: phenotypic plasticity and evolution of the wing of Calliphora vicina (Diptera) within a sub-Antarctic archipelago. SCAR Open Science Conference, Buenos Aires, Argentina, 03-06/08/2010 |
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Conference - International - Poster |
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2010 |
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136 |
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yes |
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585 |
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Author |
Geng L., Jiang Z., Alexander B., Robinson, J. W., Erbland J., Savarino, J. |
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Title |
An inverse model for corrections of the effects of post-despositional processing on snow nitrate: ice-core applications and preliminary results |
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Conference - National - Communication |
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Year |
2019 |
Publication |
AGU Fall Meeting 2019, 9-13 December 2019, San Francisco, USA |
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Abstract |
Atmospheric nitrate preserved in ice cores has been sought to provide information on past variability in atmospheric NOx, and the ?17O of ice core nitrate is a proxy to reconstruct atmospheric oxidants. However, the photo-driven post-depositional processing of snow nitrate leads to changes in nitrate concentrations and its isotopic composition (?15N and ?17O) relative to the original atmospheric signals. Such changes must be quantified and corrected for in order to use ice-core nitrate records to retrieve past information on atmospheric NOxand oxidant abundances. Here we introduce an inverse snow photochemical column model to correct for the effects of post-depositional processing. The model uses the preserved nitrate concentrations and isotopes (?15N and ?17O), applying layered snow nitrate photochemical mass-balance calculations, to recover the original atmospheric signals, i.e., nitrate deposition flux and ?15N and ?17O of the deposited nitrate. The model was tested using snowpit and atmospheric aerosol samples from Summit Greenland, and the model matches well with the observed atmospheric nitrate ?15N and ?17O. The model will be further applied to GISP2 and WAIS divide ice core records of nitrate, to recover glacial-interglacial changes in nitrate deposition flux and its isotopes, and to explore climate driven changes in atmosphere NOxand oxidant abundances. Preliminary results from the ice cores will be shown. |
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Programme |
1177 |
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Bachelor's thesis |
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7861 |
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Author |
Sultan, E., Mercier H. & Pollard R.T. |
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Title |
An inverse model of the large scale circulation in the South Indian Ocean. |
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Journal Article |
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Year |
2007 |
Publication |
Progress in oceanography |
Abbreviated Journal |
Prog. Oceanogr. |
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Volume |
74 |
Issue |
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Pages |
71-94 |
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452 |
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ISSN |
0079-6611 |
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4001 |
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