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Mineralogy and composition of the upper mantle

Anderson, Don L. and Bass, Jay D. (1984) Mineralogy and composition of the upper mantle. Geophysical Research Letters, 11 (7). pp. 637-640. ISSN 0094-8276. doi:10.1029/GL011i007p00637.

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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.

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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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Caltech Division of Geological and Planetary Sciences4078
Issue or Number:7
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Official Citation:(1984), Mineralogy and composition of the upper mantle. Geophysical Research Letters, 11: 637–640. doi: 10.1029/GL011i007p00637
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45588
Deposited By: Ruth Sustaita
Deposited On:07 May 2014 22:01
Last Modified:10 Nov 2021 17:14

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