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The 650 km mantle discontinuity

Anderson, Don L. (1976) The 650 km mantle discontinuity. Geophysical Research Letters, 3 (6). pp. 347-349. ISSN 0094-8276. doi:10.1029/gl003i006p00347.

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The bulk moduli of silicate and oxide solid solutions depend very little on iron content, but are diagnostic of crystal structure. Comparison of laboratory with seismic data suggests that the upper mantle mineral assemblages as a function of depth are: I. olivine + pyroxene + garnet (200‐400 km), II. β‐spinel + pyroxene‐garnet solid solution (400‐500 km), III. (β + γ) − spinel + pyx‐ga s.s.(500‐600) km, IV. γ‐spinel + SiO_2 (stishovite) or mixed oxides (650‐800 km) and V. mixed oxides or perovskite + MgO(>800 km). The 650 km discontinuity is primarily due to phase changes in the pyroxene‐garnet, rather than the olivine, portion of the mantle.

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Additional Information:© 1976 American Geophysical Union. (Received February 27, 1976; revised April 14, 1976; accepted April 30, 1976.) I would like to acknowledge discussions with Robert Liebermann, and A. E. Ringwood. Rhett Butler did some of the calculations. Tom Ahrens commented on the manuscript. The manuscript was considerably improved by the comments of a conscientious anonymous reviewer. This research was supported by a grant from the Standard Oil Company of California.
Group:Seismological Laboratory
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Standard Oil Company of CaliforniaUNSPECIFIED
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Caltech Division of Geological and Planetary Sciences2716
Issue or Number:6
Record Number:CaltechAUTHORS:20181128-140624582
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Official Citation:Anderson, D. L. (1976), The 650 km mantle discontinuity. Geophys. Res. Lett., 3: 347-349. doi:10.1029/GL003i006p00347
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91297
Deposited By: George Porter
Deposited On:29 Nov 2018 21:35
Last Modified:16 Nov 2021 03:40

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