MINERALOGY AND CHEMISTRY OF THE ASHMORE CHONDRITE
作者:
W. B. Bryan,
G. Kullerud,
期刊:
Meteoritics
(WILEY Available online 1975)
卷期:
Volume 10,
issue 1
页码: 41-50
ISSN:0026-1114
年代: 1975
DOI:10.1111/j.1945-5100.1975.tb00006.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
The Ashmore olivine‐bronzite chondrite is a group H, type 5 stone which differs from other H5 chondrites mainly in its higher proportion of chromite (0.9 wt %) and in the relatively lower iron and higher magnesium content of the chromite. The modal proportions of opaque phases were obtained by point‐counting in reflected light, and the modal proportions of nonopaque silicate phases in the matrix were estimated from traverses of a selected small area by electron microprobe. The consistency between the bulk chemical analysis and the chemical composition calculated from the modal mineral proportions implies that the bulk silicate composition of the chondrules is very similar to that of the silicate matrix and suggests a common source for both chondrules and mat
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