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Ca-,Al-rich inclusions in the unique chondrite ALH85085 - Petrology, chemistry, and isotopic compositionsA comprehensive study is performed for the Ca-,Al-rich inclusions (CAIs) in the unique chondrite ALH85085. The ALH85085 inclusions are smaller (5-80 microns) and more refractory than their counterparts in carbonaceous chondrites. The study includes 42 inclusions for petrography and mineralogy, 15 for bulk major and minor element chemical composition, six for Mg-Al isotopic systematics, 10 for Ca isotopes, nine for Ti isotopes, and six for trace element abundances. In addition, oxygen-isotopic compositions were determined in minerals from a single inclusion. No correlation is found between mineralogy, major element chemistry, and trace element abundances. It is further shown that the high-temperature geochemical behavior of ultrarefractory trace elements is decoupled from that of the major elements Ca and Ti (Ti is correlated with the relatively volatile elements Nb and Yb) implying that perovskite is of only minor importance as carrier of ultrarefractories.
Document ID
19930060251
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kimura, Makoto
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
El-Goresy, Ahmed
(Max-Planck-Inst. fuer Kernphysik Heidelberg, Germany)
Palme, Herbert
(Max-Planck-Inst. fuer Chemie Mainz, Germany)
Zinner, Ernst
(Washington Univ. Saint Louis, MO, United States)
Date Acquired
August 16, 2013
Publication Date
May 1, 1993
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 57
Issue: 10
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
93A44248
Funding Number(s)
CONTRACT_GRANT: NAG9-55
Distribution Limits
Public
Copyright
Other

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