NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Refractory-element-rich inclusions in CM meteoritesRefractory-element-rich inclusions of a variety of types occur in CM meteorites. Based on detailed study of Murchison and more limited investigations of Murray, Nogoya, Cold Bokkeveld and Mighei, the most common of these inclusions are small spinel-hibonite bodies rimmed with diopside. Bulk chemical compositions are estimated to be approximately 67% Al2O3, 21% MgO, 5.5% CaO, 5.5% TiO2, and 1% SiO2. Although this chemical composition does not agree closely with current theoretically predicted compositions of early condensate assemblages, the inclusions have many features which suggest that they are indeed early condensates. These include texture, mineralogical composition, sequence of minerals and magnesium isotopic composition of hibonite. The CM refractory inclusions exhibit several differences from those observed in Allende and other CV meteorites. These probably record variations in time, place or physical conditions of origin for the two cases.
Document ID
19790039447
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Macdougall, J. D.
(California, University Scripps Institution of Oceanography, La Jolla, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1979
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 42
Issue: 1, Ja
Subject Category
Lunar And Planetary Exploration
Accession Number
79A23460
Funding Number(s)
CONTRACT_GRANT: NSG-7121
Distribution Limits
Public
Copyright
Other

Available Downloads

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