NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Clouding of pyroxene and plagioclase in eucrites - Implications for post-crystallization processingThe clouding of pyroxene and plagioclase in the basaltic eucrites ALHA 77302, Juvinas, Pasamonte, and Stannern, is caused by finely disseminated inclusions. This clouding is interpreted to be the result of exsolution of minor components which became incompatible and crystallized on microfractures and other nucleation sites during postbrecciation metamorphism. The phases found in clouding require reduction of silicate FeO to metallic Fe in both pyroxene and plagioclase and possible redox of Cr(2+) to Cr(3+) in pyroxene. The assemblage of coexisting phases that make up clouding record conditions of T approximately equal to 900 C and f(O2) of 10 to the -16th to 10 to the -18th during slow cooling. Thus, clouding can be a useful indicator of postcrystallization conditions.
Document ID
19820038779
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Harlow, G. E.
(American Museum of Natural History New York, NY, United States)
Klimentidis, R.
(American Museum of Natural History New York, NY, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1980
Subject Category
Lunar And Planetary Exploration
Meeting Information
Meeting: Lunar and Planetary Science Conference
Location: Houston, TX
Start Date: March 17, 1980
End Date: March 21, 1980
Accession Number
82A22314
Funding Number(s)
CONTRACT_GRANT: NSG-7258
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available