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Basaltic volcanism on the eucrite parent body - Petrology and chemistry of the polymict eucrite ALHA80102The polymict eucrite meteorite ALHA80102 is an unequilibrated breccia of basaltic and gabbroic clasts in a fragmental matrix. Clasts include basalts of many textural types, cumulate gabbro, black 'glass', and ferroan troctolite (plagioclase, silica, Fe-rich olivine, ilmenite, mesostasis). Ferroan troctolite has not been previously reported from eucrites or howardites; it is interpreted as the end-product of fractional crystallization of eucritic magmas. Bulk and trace element compositions (by electron microprobe and INAA) of clasts and matrix from ALHA80102 are similar to those of other eucrites; the meteorite contains clasts similar to Juvinas and to Stannern. A clast of cumulate eucrite gabbro is enriched in the light rare earths (La/Lu = 2XCI). This clast is interpreted as an unrepresentative sample of metamorphically equilibrated gabbro; LREE-enriched magmas need not be invoked. ALHA80102 is similar to other polymict eucrites from the Allan Hills and may be paired with ALHA76005, ALHA77302, and ALHA78040.
Document ID
19850047894
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Treiman, A. H.
(Arizona Univ. Tucson, AZ, United States)
Drake, M. J.
(Arizona, University Tucson, AZ, 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
85A30045
Funding Number(s)
CONTRACT_GRANT: NAG9-39
Distribution Limits
Public
Copyright
Other

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