Mineralogy and composition of the upper mantle

Details Mineralogy and composition of the upper mantle Mineralogy and composition of the upper mantle

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11..637a&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 11, July 1984, p. 637-640.

Mathematics

Logic

93

Chemical Composition, Earth Mantle, Mineralogy, Planetary Composition, Seismic Waves, Lithosphere, Olivine, Pacific Ocean, Petrology, Propagation Velocity, Pyroxenes, S Waves

Scientific paper

Seismic velocities are calculated for two petrological models of the upper mantle, an olivine-rich assemblage, pyrolite, and a garnet-clinopyroxene rich, olivine bearing, assemblage, piclogite. These are compared with recent seismic profiles for various tectonic provinces. The shield data is most consistent with a cold olivine and orthopyroxene-rich LID (the seismic lithosphere) extending to 150 km followed by a high temperature gradient and/or a change in mineralogy that serves to decrease the velocity. From 200 to 400 km the velocities follow a 1400 C adiabat. The rise-tectonic mantle is much slower, presumably hotter and is likely to be above the solidus to depths of at least 300 km. The high Vp/Vs ratio of the lower oceanic lithosphere in the western Pacific is most consistent with eclogite.

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