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Identification of relict phases in a once-molten Allende inclusionFassaite rims around spinel grains that are enclosed entirely by normally zoned cores of melilite crystals are interpreted as relict grains which predate the melting of Allende type B1 refractory inclusions. Nonrelict subliquidus fassaite did not begin crystallizing from melts of these compositions until the onset of precipitation of the reversely zoned melilite mantles around the same melilite crystal cores. Relict fassaite is fractionated and highly enriched in REE and other refractory lithophiles compared to subliquidus fassaite in the same inclusion. Mass balance suggests that the relict fassaite represents only 3 percent of the original premelt amount of fassaite, and that melilite and at least one other phase were additional condensate precursors of these inclusions.
Document ID
19890062580
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kuehner, Scott M.
(Washington, University Seattle, United States)
Davis, Andrew M.
(Washington Univ. Seattle, WA, United States)
Grossman, Lawrence
(Chicago, University IL, United States)
Date Acquired
August 14, 2013
Publication Date
August 1, 1989
Publication Information
Publication: Geophysical Research Letters
Volume: 16
ISSN: 0094-8276
Subject Category
Lunar And Planetary Exploration
Accession Number
89A49951
Funding Number(s)
CONTRACT_GRANT: NAG9-111
CONTRACT_GRANT: NAG9-54
CONTRACT_GRANT: NAG9-51
Distribution Limits
Public
Copyright
Other

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