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Petrogenesis of the Elephant Moraine A79001 meteorite Multiple magma pulses on the shergottite parent bodyThe EETA 79001 achondrite consists of two distinct igneous lithologies joined along a planar, non-brecciated contact. Both are basaltic rocks composed primarily of pigeonite, augite, and maskelynite, but one contains zoned megacrysts of olivine, orthopyroxene, and chromite that represent disaggregated xenoliths of harzburzite. Both lithologies probably formed from successive volcanic flows or multiple injections of magma into a small, shallow chamber. Many similarities between the two virtually synchronous magmas suggest that they are related. Possible mechanisms to explain their differences involve varying degrees of assimilation, fractionation from similar parental magmas, or partial melting of a similar source peridotite; of these, assimilation of the observed megacryst assemblage seems most plausible. However, some isotopic contamination may be required in any of these petrogenetic models. The meteorite has suffered extensive shock metamorphism and localized melting during a large impact event that probably excavated and liberated it from its parent body.
Document ID
19830067592
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mcsween, H. Y., Jr.
(Tennessee, University Knoxville, TN, United States)
Jarosewich, E.
(Smithsonian Institution, Dept. of Mineral Sciences, Washington DC, United States)
Date Acquired
August 11, 2013
Publication Date
August 1, 1983
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 47
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
83A48810
Funding Number(s)
CONTRACT_GRANT: NSG-7413
Distribution Limits
Public
Copyright
Other

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