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Olivines and olivine coronas in mesosideritesThe paper presents a study of olivines and their surrounding coronas in mesosiderites texturally and compositionally using optical and microprobe methods. Olivine composition ranges from Fo(58-92) and shows no consistent pattern of distribution within and between mesosiderites; olivine occurs as large single crystals or as partially recrystallized mineral clasts, except for two lithic clasts. These are Emery and Vaca Muerta, and both are shock-modified olivine orthopyroxenites. Fine-grained coronas surround olivine, except for those in impact-melt group mesosiderites and those without tridymite in their matrices. Coronas consist largely of orthopyroxene, plagioclase, clinopyroxene, chromite, merillite, and ilmenite, and are similar to the matrix, but lack metal and tridymite. Texturally the innermost parts of the corona can be divided into three stages of development: (1) radiating acicular, (2) intermediate, and (3) granular.
Document ID
19800060501
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Nehru, C. E.
(Brooklyn College, Brooklyn; American Museum of Natural History, New York N.Y., United States)
Zucker, S. M.
(Brooklyn College Brooklyn, N.Y., United States)
Harlow, G. E.
(American Museum of Natural History New York, NY, United States)
Prinz, M.
(American Museum of Natural History New York, N.Y., United States)
Date Acquired
August 10, 2013
Publication Date
August 1, 1980
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 44
Subject Category
Lunar And Planetary Exploration
Accession Number
80A44671
Funding Number(s)
CONTRACT_GRANT: NSG-7258
Distribution Limits
Public
Copyright
Other

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