COMPOSITIONAL STUDY OF THE LONE TREE, IOWA, CHONDRITE
作者:
G. R. McCormick,
J. H. Carman,
期刊:
Meteoritics
(WILEY Available online 1975)
卷期:
Volume 10,
issue 1
页码: 67-74
ISSN:0026-1114
年代: 1975
DOI:10.1111/j.1945-5100.1975.tb00009.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
A meteorite, named for the location of its discovery near Lone Tree, Iowa, was found by Loren Westfall in May 1971. Electron microprobe and petrographic studies reveal its mineral composition to be olivine, low‐calcium clinopyroxene, high‐calcium clinopyroxene, troilite, kamacite, taenite and iron oxides.On the basis of texture, olivine composition (19% Fa), low‐calcium clinopyroxene composition (17% Fs, 2% Wo) and metal (determined by modal analysis), this meteorite is classified as an H group bronzite chondrite. While it has characteristics of classes 3 and 4 (Van Schmus and Wood, 1967, Table 2) it fits class 4 better since low‐calcium pyroxene has a MD of 5.6%, olivine has a MD of 3.2%, turbid glass is present in chondrules, feldspar is absent, and the matrix is opaque. The opacity of the matrix may be due to iron oxides in microfractures in a microcrystalline
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