The role of volatiles in the transition zone

Details The role of volatiles in the transition zone The role of volatiles in the transition zone

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.4287g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. B3, p. 4287-4299.

Physics

58

Earth Mantle, Mineralogy, Phase Transformations, Pressure Effects, Volatility, Ilmenite, Magnesium Oxides, Mercury Compounds, Silicon Dioxide, Stishovite, Subduction (Geology)

Scientific paper

An experimental study in the MgO-SiO2 system with low contents of H2O, F2, and Cl2 is presented that elucidates the role of volatiles in the mantle and identifies additional evidence for mantle stratification. The results suggest that mantle temperatures are higher than those of the volatile solidus, and most of the mantle is partially molten due to the presence of the volatiles. The high-velocity gradients in the transition zone can be explained by chemical variations in the garnet layer and the subducted oceanic slabs, although the presence of stishovite as the cause for the high-velocity gradients cannot be completely excluded. The upper mantle consists of several chemically stratified layers which include the layers of peridotite, pyroxenite, and garnetite produced during the crystallization of a magma ocean.

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