In situ X-ray observation of decomposition of superhydrous phase B at high pressure and temperature

Details In situ X-ray observation of decomposition of superhydrous phase B at high pressure and temperature In situ X-ray observation of decomposition of superhydrous phase B at high pressure and temperature

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30b...1o&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 2, pp. 1-1, CiteID 1029, DOI 10.1029/2002GL015549

Physics

6

Mineral Physics: High-Pressure Behavior, Mineral Physics: X Ray, Neutron, And Electron Spectroscopy And Diffraction, Mineralogy, Petrology, And Mineral Physics: Experimental Mineralogy And Petrology, Tectonophysics: Earth'S Interior-Composition And State (1212)

Scientific paper

High pressure and high temperature in situ X-ray diffraction experiments on the stability of superhydrous phase B have been conducted to clarify the host of water in the slabs descending into the lower mantle. We observed the decomposition reaction of superhydrous phase B into phase G (= phase D and F), periclase, and MgSiO3 perovskite at around 700 ~1100°C and above 30 GPa, and the boundary of the decomposition reaction can be expressed as P(GPa) = -0.0037(+/-0.0017)T(°C) + 32.2(+/-0.5). This reaction can occur in slabs descending into the uppermost part of the lower mantle.

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