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Origin of olivine at CopernicusThe central peaks of Copernicus are among the few lunar areas where near-infrared telescopic reflectance spectra indicate extensive exposures of olivine. Other parts of Copernicus crater and ejecta, which were derived from highland units in the upper parts of the target site, contain only low-Ca pyroxene as a mafic mineral. The exposure of compositionally distinct layers including the presence of extensive olivine may result from penetration to an anomalously deep layer of the crust or to the lunar mantle. It is suggested that the Procellarum basin and the younger, superposed Insularum basin have provided access to these normally deep-seated crustal or mantle materials by thinning the upper crustal material early in lunar history. The occurrences of olivine in portions of the compositionally heterogeneous Aristarchus Region, in a related geologic setting, may be due to the same sequence of early events.
Document ID
19850047880
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Pieters, C. M.
(Brown University Providence, RI, United States)
Wilhelms, D. E.
(U.S. Geological Survey Menlo Park, CA, 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
85A30031
Funding Number(s)
CONTRACT_GRANT: NASA ORDER W-13709
CONTRACT_GRANT: NAGW-28
Distribution Limits
Public
Copyright
Other

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