Water content in high dimensional defects in the Earth's Mantle

Details Water content in high dimensional defects in the Earth's Mantle Water content in high dimensional defects in the Earth's Mantle

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.v41d1765s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #V41D-1765

Physics

1012 Reactions And Phase Equilibria (3612, 8412), 1025 Composition Of The Mantle, 1037 Magma Genesis And Partial Melting (3619), 1038 Mantle Processes (3621), 1060 Planetary Geochemistry (5405, 5410, 5704, 5709, 6005, 6008)

Scientific paper

The Earth is a wet planet, where water is recycled from the mantle to the surface and back again. The mantle is generally too hot for the stability of hydrous minerals and too cold to store water within significant melt sheets. Therefore, the current paradigm in geosciences is that water resides within point defects in nominally anhydrous minerals such as olivine, pyroxene and garnet. We present here the first high-resolution synchrotron based FT-IR (Fourier Transform Infrared Spectroscopy) maps of water within olivine (Mg,Fe)2SiO4 in higher dimensional defect structures than point defects. Analyses were performed on micrometer size mineral inclusions and fully embedded nanometre size cracks within olivine. We find that within single olivine grains, there is a strong variation of water content at all length scales, principally controlled by 2-dimensional defects such as grain boundaries and cracks. The findings have two major ramifications: 1) it throws new light on the role of water in defects within the mantle, there appears to be a critical interplay between mineral water reservoirs from point defects into 2-dimensional defects; 2) it suggests that there is more water in the mantle than previously thought. High dimension defects provide a new mantle reservoir of water.

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