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Sylvie Demouchy
Short CV and publications
July 2009
- Triple junction between olivine, cpx and opx.
Picture above : A triple junction between olivine, cpx and opx in a lherzolite xenolith from Pali-Aike (Chile). All tree minerals contain a small amount of hydrogen embedded as point defect.
The incorporation of hydrogen will modified the physical properties of each solids, as well as the properties of the rock (viscosity, electrical conductivity, melting point, etc...). Please see Demouchy et al.( 2006) for further details on this study.
Research positions and education
Nov- 2007/ to present - CNRS scientific researcher (CR2) at Géosciences Montpellier, France. Tenure since Nov 2008.
2004/2007 - Research associate (post-doctoral fellowship) at the Lunar and Planetary Inst. USRA, Houston, visiting researcher at the University of Minnesota, Minneapolis.
2000/2004 - Ph.D (Dr. rer. nat.) in Mineral Physics, Bayerisches Geoinstitut, University of Bayreuth, Germany.
1999/2000 - Master (DEA) in geochemistry, LGCA, Grenoble, France.
Before : DEUG SVT, licence STU, Maitrise STU in Earth Sciences at Aix-Marseille I and III Universities, South of France.
Research interests
- Mineral physics and igneous petrology
- Point defects in solids, diffusion and deformation processes.
- Concentration, distribution and mobility of hydrogen in nominally anhydrous minerals
- Peridotites (thoses losing hydrogen...), komatiites and other ultramafics.
- Experimental apparatus (piston-cylinder, TZM vessel, multi-anvils, Paterson apparatus)
- EMPA, FTIR, SEM-EBSD and SIMS.
Publications
1. Demouchy S. and Mackwell S. (2003). Water Diffusion in Synthetic Iron-Free Forsterite. Phys. Chem. Minerals. 30. 786-794.
2. Bureau H., Trocellier P., Shaw C., Khodjia H., Bolfan-Casanova N. and Demouchy S. (2003) Determination of the concentration of water dissolved in glasses and minerals using nuclear microprobe. Nuclear Instrument Methods. ICNMTA 2002. Special issue, B201, 449-454.
3. Jacobsen S. D, Demouchy S., Frost, D. J. Boffa-Ballaran T. and Kung J. (2005) A systematic study of OH in hydrous wadsleyite from polarized FTIR spectroscopy and single-crystal X-ray diffraction : oxygen sites for hydrogen storage in the Earth’s interior. Am. Min., 90, 61-70.
4. Demouchy S., Deloule E., Frost D. J. and Keppler H. (2005) Temperature and pressure dependence of water solubility in iron free-wadsleyite. Am. Mineral, 90, 1084-1091.
5. Demouchy S., Jacobsen S. D., Gaillard F. and Stern C. R. (2006) Rapid magma ascent recorded by water diffusion profiles in mantle olivine. Geology, 34, 429-432.
6. Demouchy S. and Mackwell S. (2006) Mechanisms of hydrogen incorporation and diffusion in iron-bearing olivine. Phys. Chem. Minerals, 33, 347-355.
7. Walker A.M, Demouchy S., and Wright K. (2006) Computer modelling of the energies and vibrational properties of hydroxyl groups in α- and β-Mg2SiO4. Eur. J. Mineral, 18 (5), 529-543.
8. Demouchy S., Mackwell S.J., and Kohlstedt D. L. (2007) Influence of hydrogen on Mg-Fe interdiffusion in (Mg,Fe)O and implication for the Earth’s lower mantle. Contrib. Mineral. Petrol., 154:279-289.
9. Kamemetsky V, Kamenetsky M B, Sobolev A V, Golovin A V, Demouchy S, Faure K, Sharygin V V, Kuzmin D V.(2008) Olivine in the Udachnaya-East kimberlite : types, compositions and origins. J. Petrol., 49 : 823-839.
10. Demouchy S., Schneider S. E., Mackwell S. J., Zimmerman M. E., Kohlstedt D L. (2009) Experimental deformation of olivine single crystals at lithospheric temperatures, Geophys. Res Lett. 36, L04304.
11. Soustelle V., Tommasi A., Demouchy S., Ionov D. Deformation and fluid-rock interactions in supra-subduction mantle : Microstructures and water contents in peridotite xenoliths from the Avacha volcano, Kamchatka, J. Petrol., 51:363-394.
12.Demouchy S.. Diffusion of hydrogen in olivine grain boundaries and its implications for the survival of water-rich zones in Earth’s mantle. submitted to EPSL.
13.Demouchy S.. Hydrogen diffusion in spinel grain boundaries and consequences for chemical homogeniszation in hydrous peridotites. submitted to CMP.
Most recent presentations at scientifc institutions and meetings
Demouchy S., Stern C., Jacobsen J.D.,(13/12/2006) The dehydration of mantle xenoliths as a new tool to witness magma ascent. AGU fall meeting 2006. Session V15.
Demouchy S., Kohlstedt D. L. and Mackwell S.J., (15/12/2006). Hydrogen enhancement of Mg-Fe Interdiffusion in (Mg,Fe)O”. AGU fall meeting 2006. Session MR10 (invited talk).
Demouchy S., and Kohlstedt D. L (9/8/2007). Effect of Hydrogen on the ionic diffusion in minerals”. Second VLab/compress workshop (invited talk).
Demouchy S. (13/9/2007). Invited seminar, Dept. of Geology and Geophysics, University of Minnesota, Minneapolis : "Diffusivity of Water in the Deep Earth : Reports from the Lab, Rumors from Patagonia".
Demouchy S. (02/10/2007). Invited seminar, American Museum of Natural History (Earth & Planetary Sciences Division), NYC, NY, U.S.A : "Diffusivity of Water in the Deep Earth : Reports from the Lab, Rumors from Patagonia".
Demouchy S. (03/10/2007). Invited Seminar, Lamont-Doherty Earth Observatory (Geochemistry Division), Palisade, NY, U.S.A. : "Diffusivity of Water in the Deep Earth : Reports from the Lab, Rumors from Patagonia".
Demouchy S. (07/02/2008). Seminaire invité, équipe de recherche manteau-noyau, Géosciences Montpellier. La diffusion ionique dans l’olivine : un nouveau témoin du temps qui passe.
Demouchy S. (21-27/06/2009). Hydrogen diffusion in grain boundaries : an experimental approach. Goldschmidt conference, Davos, Swissland. Poster
Other interests outside the lab
Books, Cooking&eating, watercolor&drawings, engraving techniques, modern art, photography, gardens and landscape architecture, english poetry (e.e.cummings), cinema, New York City by night and by day, to drink chablis, to make capsule, to bother you.
- CV -in english-
