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The origin and significance of reverse zoning in melilite from Allende Type B inclusionsMany of Type B Allende inclusions are found to have reverse zoning over restricted portions of each crystal, in contrast to those in Type A's, which are reversely zoned throughout. Results of dynamic crystallization experiments on compositions similar to an average Type B inclusion are reported in which reversely zoned melilite rims were grown on normally zoned cores. The fact that these zoning patterns have been duplicated is interpreted as evidence that natural melilites having such zoning were formed by crystallization from a melt. Since reverse zoning could only be produced over a restricted range of experimental conditions, the presence in natural inclusions of the kinds of zoning patterns described here may place constraints on the conditions under which the inclusions formed.
Document ID
19850059946
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Macpherson, G. J.
(Chicago Univ. Chicago, IL, United States)
Paque, J. M.
(Chicago Univ. Chicago, IL, United States)
Stolper, E.
(Chicago Univ. Chicago, IL, United States)
Grossman, L.
(Chicago, University IL; California Institute of Technology, Pasadena, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1984
Publication Information
Publication: Journal of Geology
Volume: 92
ISSN: 0022-1376
Subject Category
Lunar And Planetary Exploration
Accession Number
85A42097
Funding Number(s)
CONTRACT_GRANT: NAGW-257
CONTRACT_GRANT: NGR-14-001-249
CONTRACT_GRANT: NSF EAR-82-18154
CONTRACT_GRANT: NAG9-54
Distribution Limits
Public
Copyright
Other

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