Olivine emerges from isolation
Article Abstract:
The exchange of magnesium and iron between olivine and other mantle minerals is a significant factor in resolving the apparent discrepancies between sharp rises in the speeds at which seismic waves travel in Earth's mantle near a depth of 410 km and seismological studies showing wave-speed rises that are smaller and more abrupt than anticipated from extrapolation of the laboratory response of these minerals to mantle conditions. It has been shown that olivine polymorphs exchange Fe and Mg with their pyroxene and garnet companions under mantle conditions, instead of residing in isolation.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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Unmixing of hot inorganic melts
Article Abstract:
A new analysis of the geochemical data shows that phase transition along with rising temperature occurs among oxide liquids. This phase transition requires a lower critical solution temperature (LCST) a property that according to thermodynamics should be present in the oxide liquids as well as in silicates, borates and phosphates. Ceramic and magmatic systems would be affected by the occurrence of LCST among the oxides. High-temperature spectroscopy and other up-to-date techniques should be brought to bear to find the oxide LCST.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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Possible presence of high-pressure ice in cold subducting slabs
Article Abstract:
The presence of solid ice VII in subducting slabs, formed by dehydration reactions of water from minerals in the oceanic lithospheres, is discussed.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
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