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Cation disorder in shocked orthopyroxene.The study of cation distributions over nonequivalent lattice sites in minerals may reveal information on the history of temperature and pressure in rocks. Chemically homogeneous orthopyroxene specimens were shocked under well-controlled conditions in the laboratory in order to provide a basis for the interpretation of more complex natural materials. As a result of the investigation it is concluded that the distribution of magnesium and iron over the M1 and M2 positions in Bamle enstatite shocked at 1 megabar is highly disordered. It corresponds to an equilibrium distribution of at least 1000 C.
Document ID
19720026627
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Dundon, R. W.
(Milwaukee, University Milwaukee, Wis., United States)
Hafner, S. S.
(Chicago, University Chicago, Ill., United States)
Date Acquired
August 6, 2013
Publication Date
November 5, 1971
Publication Information
Publication: Science
Volume: 174
Subject Category
Geophysics
Accession Number
72A10293
Funding Number(s)
CONTRACT_GRANT: NSF GA-14811
CONTRACT_GRANT: NAS9-8080
Distribution Limits
Public
Copyright
Other

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