Other
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....14875r&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #14875
Other
Scientific paper
Numerous studies have been devoted to the determination of water solubility in mantle material [1]. They all show strong solubility variations from one mineral phase to another. Principally, water partitioning has made the transition zone a probable trap for water from the Earth's mantle [2]. Nevertheless, previous numerical study [3] suggests the presence of 'free' water in the lower mantle. We have studied the behaviour of this 'free' phase and its importance in the water distribution just below the transition zone (660 km depth) in a 2D cartesian geometry. The model takes into account water partitioning between the mantle's transition zone and the upper-mantle of 10:1 and between the lower-mantle and the transition zone of 1:100 (i.e. respectively between olivine-spinel and spinel-postspinel). We have modelled two possible transport processes for the 'free' water: Diffusion and percolation. Our numerical experiments show that the presence of a ‘free phase’ modifies the water distribution in this area. Percolation process is more efficient to hydrate the transition zone than diffusion one, even in a very high diffusivity case. [1] J. Ingrin, H. Skogby, Hydrogen in nominally anhydrous upper mantle minerals: Concentration levels and implications, Eur. J. Mineral. 12 (2000) 543-570. [2] N. Bolfan-Casanova, H. Keppler, D. C. Rubie, Water partitioning between nominally anhydrous minerals in the MgO-SiO2-H2O system up to 24 GPa: implications for the distribution of water in Earth's mantle, Earth Planet. Sci. Lett. 182 (2000) 209-221. [3] G. C. M. Richard, M. Monnereau, J. Ingrin, Is the transition zone an empty water reservoir? Inferences from numerical model of mantle dynamics, Earth. Planet. Sci. Lett. 205 (2002) 37-51.
Ingrin Jannick
Monnereau Marc
Ricard Yanick
Richard Guillaume C.
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