Ca-,Al-rich inclusions in the unique chondrite ALH85085 - Petrology, chemistry, and isotopic compositions

Details Ca-,Al-rich inclusions in the unique chondrite ALH85085 - Petrology, chemistry, and isotopic compositions Ca-,Al-rich inclusions in the unique chondrite ALH85085 - Petrology, chemistry, and isotopic compositions

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.2329k&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 57, no. 10, p. 2329-2359.

Computer Science

30

Chemical Composition, Chondrites, Inclusions, Petrology, Trace Elements, Aluminum Compounds, Calcium Compounds, Chemical Analysis, Isotopes, Oxides, Scanning Electron Microscopy, Meteorites, Stony Meteorites, Chondrites, Alh Meteorites, Alh 85085, Cais, Inclusions, Composition, Samples, Meteorite, Petrology, Chemistry, Isotopes, Laboratory Studies, Comparisons, Mineralogy, Major Elements, Minor Elements, Trace Elements, Description, Calcium, Titanium, Oxides, Procedure, Minerals, Microprobe Methods, Refract

Scientific paper

A 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.

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