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Ubiquitous high-FeO silicates in enstatite chondritesSEM and EMPA were used to determine the mineral contents of four EH3 chondrites. All four showed the dominant enstatite peak, Fs 0-5, with 4-8 percent of FeO-rich pyroxene with Fs 5-20. Among the 542 objects found to contain high-FeO silicates, 18 were chondrules, 381 were rimmed or unrimmed grains, and 143 were aggregates. The high-FeO silicates in these objects are very largely pyroxene with Fs 5-23. Large grains of both FeO-rich and FeO-poor silicates were found to be present in the FeO-rich chondrules. This fact, together with the absence of clasts of FeO-rich chondritic material in the EH3 chondrites, suggests that FeO-rich grains were introduced before or during chondrule formation. It is concluded that FeO-rich and FeO-poor silicates were both present in the nebular region where E chondrites originated.
Document ID
19870046812
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lusby, David
(New Mexico Univ. Albuquerque, NM, United States)
Scott, Edward R. D.
(New Mexico Univ. Albuquerque, NM, United States)
Keil, Klaus
(New Mexico, University Albuquerque, United States)
Date Acquired
August 13, 2013
Publication Date
March 30, 1987
Publication Information
Publication: Journal of Geophysical Research
Volume: 92
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
87A34086
Funding Number(s)
CONTRACT_GRANT: NAG9-30
Distribution Limits
Public
Copyright
Other

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