Published June 1976
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Journal Article
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The 650 km mantle discontinuity
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Abstract
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.
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.Attached Files
Published - Anderson-1976-Geophysical_Research_Letters.pdf
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Anderson-1976-Geophysical_Research_Letters.pdf
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Identifiers
- Eprint ID
- 91297
- Resolver ID
- CaltechAUTHORS:20181128-140624582
Funding
- Standard Oil Company of California
Dates
- Created
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2018-11-29Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field
Caltech Custom Metadata
- Caltech groups
- Seismological Laboratory
- Other Numbering System Name
- Caltech Division of Geological and Planetary Sciences
- Other Numbering System Identifier
- 2716