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Dynamic crystallization experiments on the Angra dos Reis achondritic meteoriteThe types of cooling histories necessary to produce the porphyritic texture and the observed mineral assemblage in Angra dos Reis (ADOR) achondritic meteorite, which, on the basis of its trace element characteristics was considered to be a cumulate with a recrystallized texture, while a recent model suggested that ADOR is a porphyry. Dynamic crystallization experiments were conducted with nucleation conditions varied by melting the starting material at different degrees of superheat. The results show that, at low pressure, a volcanic or hypabyssal history of ADOR is possible. The most likely history involved cooling from a slightly subliquidus temperature with a relatively high and irregular nucleation density resulting in a granular texture with the poikilitic fassaite growing late; accumulation of some crystal is tought to be probable.
Document ID
19920069964
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lofgren, G. E.
(NASA Johnson Space Center Houston, TX, United States)
Lanier, A. B.
(Lockheed Engineering and Sciences Co. Houston, TX, United States)
Date Acquired
August 15, 2013
Publication Date
July 1, 1992
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 111
Issue: 2-4,
ISSN: 0012-821X
Subject Category
Lunar And Planetary Exploration
Accession Number
92A52588
Distribution Limits
Public
Copyright
Other

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