In situ X-ray experiment on the structure of hydrous Mg-silicate melt under high pressure and high temperature

Details In situ X-ray experiment on the structure of hydrous Mg-silicate melt under high pressure and high temperature In situ X-ray experiment on the structure of hydrous Mg-silicate melt under high pressure and high temperature

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3410303y&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 10, CiteID L10303

Physics

6

Mineralogy And Petrology: Magma Genesis And Partial Melting (1037), Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineral Physics: High-Pressure Behavior, Mineral Physics: X-Ray, Neutron, And Electron Spectroscopy And Diffraction, Mineral Physics: Instruments And Techniques

Scientific paper

Structure of a hydrous silicate melt with a forsterite-enstatite-H2O composition was investigated by in-situ X-ray diffraction with synchrotron radiation. The high temperature hydrous melt was successfully enclosed in a single-crystal diamond capsule under high pressure, up to 6.5 GPa. Results showed that the first sharp diffraction peak (FSDP), which reflects the intermediate-range structure of the complex melt, shifted drastically toward higher Q (scattering vector [Å-1]) at pressure below 2.2 GPa. This observation indicates that the silicate network in the melt was depolymerized by the influence of water molecules and partly replaced by Si-OH units under those high-pressure conditions. In contrast, between 3-5 GPa, such a peak shift was not clearly detected, suggesting that the lengthening of the intermediate-range ordering of ...-Si-O-Si-... linkage (i.e., polymerization of silicate network) occurred.

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