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Phase Changes in the Upper Mantle

Anderson, Don L. (1967) Phase Changes in the Upper Mantle. Science, 157 (3793). pp. 1165-1173. ISSN 0036-8075. http://resolver.caltech.edu/CaltechAUTHORS:20140428-140945175

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Abstract

The C-region of the upper mantle has two transition regions 75 to 90 kilometers thick. In western North America these start at depths of 365 kilometers and 620 kilometers and involve velocity increases of about 9 to 10 percent. The locations of these transition regions, their general shape, and their thicknesses are consistent with, first, the transformation of magnesium-rich olivine to a spinel structure and, then, a further collapse of a material having approximately the properties of the component oxides. The velocity increases associated with each transition region are slightly less than predicted for the appropriate phase change. This can be interpreted in terms of an increasing fayalite content with depth. The location of the transition regions and the seismic velocities in their vicinity supply new information regarding the composition and temperature of the upper mantle. The depths of the transition regions are consistent with temperatures near 1500°C at 365 kilometers and 1900°C at 620 kilometers.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1126/science.157.3793.1165DOIArticle
http://www.sciencemag.org/content/157/3793/1165.abstractPublisherArticle
http://www.jstor.org/stable/1721760OrganizationArticle
Additional Information:© 1967 American Association for the Advancement of Science. Received 24 July 1967. Supported in part by a Sloan Foundation Fellowship and by the Air Force Office of Scientific Research, Office of Aerospace Research, United States Air Force, under AFOSR contract AF-49(638)-1337. I thank L. Johnson, C. Archambeau, E. A. Flinn, T. J. Ahrens, Y. Syono, and H. Kanamori for preprints of their manuscripts, and B. Kamb, L. Silver, and A. Albee for discussion. Contribution No. 1467.
Funders:
Funding AgencyGrant Number
Alfred P. Sloan FoundationUNSPECIFIED
Air Force Office of Scientific Research (AFOSR)AF-49(638)-1337
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Caltech Division of Geological Sciences1467
Record Number:CaltechAUTHORS:20140428-140945175
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140428-140945175
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45252
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:28 Apr 2014 21:20
Last Modified:28 Apr 2014 21:20

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