Static compression of chondrodite: Implications for water in the upper mantle

Details Static compression of chondrodite: Implications for water in the upper mantle Static compression of chondrodite: Implications for water in the upper mantle

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.1935f&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 18, p. 1935-1938

Other

15

Earth Mantle, Magnesium Oxides, Mathematical Models, Moisture Content, Phase Transformations, Equations Of State, Mineralogy, Pressure Effects, Temperature Effects, X Ray Diffraction

Scientific paper

We have determined the equation of state of chondrondite (2Mg2SiO4-Mg(OH,F)2), a possible water-bearing phase in the upper mantle, to 42.3 GPa at room temperature using x-ray diffraction through the diamond cell. The isothermal bulk modulus of chondrodite, determined using the Birch-Murnaghan equation of state, is 136.2 GPa with a pressure derivative of 3.7. Using our results, we have constructed density models for hydrous upper mantle compositions. These models indicate that up to 2 weight percent water could be present in a pyrolitic mantle, and be undetectable using seismically-determined density constraints. We have also investigated the stability of chondrodite under lower mantle pressure and temperature conditions using the laser-heated diamond cell. From in-situ x-ray diffraction at high pressure, and x-ray diffraction and infrared reflectance and absorption spectra of quenched run products, we conclude that chondrodite breaks down to MgSiO3 perovskite, MgO and a hydrated melt at lower mantle pressures and temperatures.

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