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Chemical zoning and homogenization of Pasamonte-type pyroxene and their bearing on thermal metamorphism of a howardite parent bodyThe Mg-Fe zoning of pyroxenes in Pasamonte and Juvinas eucrites is examined in order to gain a better understanding of the metamorphism in the surface layer of a eucrite/howardite parent body. Three distinct types of Ca-Mg-Fe zoning of Pasamonte pyroxenes are identified. The wide compositional range of the zoned pyroxenes suggests that Pasamonte is less metamorphosed than previously believed. It is also found that a Pasamonte-type pyroxene may yield a Juvinas-type pyroxene by thermal metamorphism. Calculations imply that the homogenization of Juvinas pyroxenes may have occurred during later reheating events rather than during initial cooling.
Document ID
Document Type
Reprint (Version printed in journal)
Miyamoto, M.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Duke, M. B.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Mckay, D. S.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 12, 2013
Publication Date
February 15, 1985
Publication Information
Publication: Journal of Geophysical Research, Supplement
Volume: 90
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
Distribution Limits

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