CALCIUM‐ALUMINIUM‐RICH CHONDRULES IN THE UNEQUILIBRATED ORDINARY CHONDRITES
作者:
Hiroko Nagahara,
Ikuo Kushiro,
期刊:
Meteoritics
(WILEY Available online 1982)
卷期:
Volume 17,
issue 2
页码: 55-63
ISSN:0026-1114
年代: 1982
DOI:10.1111/j.1945-5100.1982.tb00556.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
Calcium‐aluminium‐rich chondrules were found in L‐3 (ALH‐77015) and LL‐3 (ALH‐77278) chondrites. They consist of spinel, olivine, fassaite and glassy groundmass enriched in anorthite component. The bulk chemical compositions of the two chondrules are nearly the same and resemble those of the calcium‐aluminium‐rich inclusions in the carbonaceous chondrites, but the former is more enriched in MgO and SiO2and depleted in Al2O3and CaO. The calcium‐aluminium‐rich chondrules would have been primarily early condensates which existed at the place where the chondrules were formed, and heated up to 1400 °C or higher to have melted and cooled at the rate similar to those for other chondrules, or the products of intensive heating followed
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