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Classification of mafic clasts from mesosiderites - Implications for endogenous igneous processesResults are presented from an analysis of 13 igneous pebbles from the Vaca Muerta, EET87500, and Bondoc mesosiderites, using electron microprobe and instrumental neutron activation techniques. These data, combined with literature data on compositions of 43 mesosiderite clasts were used to compile a classification scheme for the various types of mafic silicate clasts that occur in mesosiderites. These clasts were classified into five principal groups: (1) polygenic and monogenic cumulates (30 percent); (2) polygenic basalts (30 percent); (3) quench-textured rocks, comprising two compositional subgroups (those which resemble basaltic eucrites (5 percent), and those which resemble cumulate eucrites (2 percent)); (4) monogenic basalts (11 percent); and (5) ultramafic rocks, consisting mainly of large crystals of orthopyroxene (9 percent) or olivine (4 percent). The conditions under which these clasts were formed are discussed.
Document ID
19920044030
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Rubin, Alan E.
(California, University Los Angeles, United States)
Mittlefehldt, David W.
(Lockheed Engineering and Sciences Co. Houston, TX, United States)
Date Acquired
August 15, 2013
Publication Date
February 1, 1992
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 56
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
92A26654
Funding Number(s)
CONTRACT_GRANT: NAG9-40
PROJECT: RTOP 152-13-40-21
Distribution Limits
Public
Copyright
Other

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