High-pressure decompositions in manganese silicates and their geophysical implications

Details High-pressure decompositions in manganese silicates and their geophysical implications High-pressure decompositions in manganese silicates and their geophysical implications

May 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974pepi....8..241i&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 8, Issue 3, p. 241-245.

Physics

3

Scientific paper

High-pressure experiments on manganese silicates at a temperature of about 1000°C have shown the following reactions: (1) Mn2SiO4 --> MnO + MNSiO3 ~ 140 kbar (olivine) (rock (tetragonal salt) ``garnet'') (2) Mn2SiO4 --> 2MnO + SiO2 ~ 300(+/-50)kbar (olivine (rock (stishovite) salt) and, by inference: (3) MnSiO3 --> MnO + SiO2 ~ 300(+/-50)kbar (tetragonal (rock (stishovite) ``garnet'') salt) This work supports earlier suggestions that ferromagnesian silicates in the earth's mantle transform to spinel-like and garnet-like phases in the transition zone, but disproportionate to dense oxides in the lower mantle.

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