24-28 Sep 2017 Saint Malo (France)

Author index > Raepsaet Caroline

WATER INCORPORATION IN TRANSITION ZONE MINERALS, WADSLEYITE AND RINGWOODITE: A STUDY USING ERDA (ELASTIC RECOIL DETECTION ANALYSIS)
Nathalie Bolfan  1@  , Federica Schiavi  1@  , Davide Novella  2@  , Helene Bureau  3@  , Caroline Raepsaet  4@  , Hicham Khodja  4@  , Sylvie Demouchy  5@  
1 : Laboratoire Magmas et Volcans  (LMV)  -  Website
Université Jean Monnet [Saint-Etienne], Université Clermont Auvergne, Centre National de la Recherche Scientifique : UMR6524
Campus Universitaire des Cézeaux, 6 Avenue Blaise Pascal, 63178 Aubière Cedex -  France
2 : University Of Cambridge
3 : Institut de minéralogie, de physique des matériaux et de cosmochimie  (IMPMC)  -  Website
Museum National d'Histoire Naturelle, Université Pierre et Marie Curie - Paris 6 : UM120, Institut de recherche pour le développement [IRD] : UR206, Centre National de la Recherche Scientifique : UMR7590
Tour 23 - Barre 22-23 - 4e étage - BC 115 4 place Jussieu 75252 PARIS -  France
4 : CEA Saclay  (CEA)  -  Website
Commissariat à l'énergie atomique et aux énergies alternatives
91191 Gif-sur-Yvette cedex -  France
5 : Géosciences Montpellier  -  Website
Université des Antilles et de la Guyane, Institut national des sciences de l\'Univers, Université de Montpellier, Centre National de la Recherche Scientifique : UMR5243, Institut national des sciences de l\'Univers, Institut national des sciences de l\'Univers, Institut national des sciences de l\'Univers, Institut national des sciences de l\'Univers, Institut national des sciences de l\'Univers
Université de Montpellier Campus Triolet cc060 Place Eugène Bataillon 34095 Montpellier Cedex05 -  France

The transition zone is potentially an important water reservoir within the Earth. Indeed, transition zone minerals, namely wadsleyite and ringwoodite, can contain up to 3.2 wt% H2O by weight (Inoue et al., 1995). In recent years, we have been working on extending the capabilities of measurements of water in minerals using other techniques than Fourier Transform Infrared spectroscopy (FTIR) like Raman spectroscopy (Bolfan-Casanova et al., 2014) that allows the use of very small probing beams under reflection geometry, but also ERDA (Elastic Recoil detection Analysis, Bureau et al., 2009; Withers et al., 2012) that allows quantification without the use of any standards. The main problem of using FTIR on wadsleyite and ringwoodite is that these phases are often too absorbing to allow proper quantification of water. Also, whenever working on realistic, i.e. complex, compositions, samples end up having small grain sizes that are difficult to deal with FTIR when the samples are polyphasic.

Thanks to ERDA, we calibrate the Raman spectroscopy for quantifying water in wadsleyite and ringwoodite. We will also discuss the incorporation mechanisms of H in both phases.


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