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Mineral chemistry and origin of spinel-rich inclusions in the Allende CV3 chondriteThe present electron probe microanalysis of 20 spinel-rich inclusions in Allende indicates that the mineralogy of spinel-rich Allende inclusions is similar to that of fine grained Ca, Al-rich inclusions (CAIs) in ALH-77003 and rims on coarse grained CAIs in Allende. The mineralogy, mineral chemistry, and bulk chemistry of the inclusions indicate that they are not primitive aggregates of crystalline nebular condensates, but rather aggregates of minute concentric objects that are presently interpreted to be a fractionated distillation residue that lost Ca, Si-rich partial melt. It is suggested that interstellar dust aggregates were melted or distilled into Allende inclusions by aerodynamic drag heating, in regions of the nebula where the dust/gas ratio was so enhanced that the local oxygen fugacity was raised by several order of magnitude and liquids became thermodynamically stable.
Document ID
19850055326
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kornacki, A. S.
(Shell Oil Co. Houston, TX, United States)
Wood, J. A.
(Smithsonian Astrophysical Observatory Cambridge, MA, United States)
Date Acquired
August 12, 2013
Publication Date
May 1, 1985
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 49
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
85A37477
Funding Number(s)
CONTRACT_GRANT: NAG9-28
CONTRACT_GRANT: NGL-22-009-521
Distribution Limits
Public
Copyright
Other

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