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Published July 1984 | Published
Journal Article Open

Mineralogy and composition of the upper mantle


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 V_p/V_s ratio of the lower oceanic lithosphere in the western Pacific is most consistent with eclogite.

Additional Information

© 1984 American Geophysical Union. Received May 7, 1984; accepted May 17, 1984. Paper number 4L6171. We thank the reviewers of this paper for their comments. This research was supported by the National Science Foundation under Grant No. EAR811-5236. Contribution number 4078, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125.

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