Petrographic comparison of refractory inclusions from different chemical groups of chondrites
Petrographic comparison of refractory inclusions from different chemical groups of chondrites
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DOI：
10.1111/j.1945-5100.2006.tb00193.x
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发表时间：
2006-01
影响因子：
2.2
通讯作者：
Y. Lin;M. Kimura;B. Miao;D. Dai;A. Monoi
中科院分区：
文献类型：
--
作者：
Y. Lin;M. Kimura;B. Miao;D. Dai;A. Monoi
摘要-通过对18个普通陨石进行X射线成像，发现了24个难熔夹杂物（40-230 μm，平均86 ± 40 μm）。所有的包裹体都有严重的蚀变，由细粒的菱铁矿、尖晶石和钙辉石以及少量的钛铁矿组成。富铁尖晶石和钛铁矿的存在和黄长石的缺乏是由于在氧化条件下发生的蚀变，如富FeO-ZnO-尖晶石和钛铁矿所示。蚀变前矿物组合主要有两种类型：一种富含黄长石，称为A型，另一种富含尖晶石，称为尖晶石辉石包裹体。这项研究和以前的数据表明，在普通和顽火辉石耐火夹杂物的类型和尺寸分布相似。
Abstract— Twenty‐four refractory inclusions (40–230 μm, with average of 86 ± 40 μm) were found by X‐ray mapping of 18 ordinary chondrites. All inclusions are heavily altered, consisting of finegrained feldspathoids, spinel, and Ca‐pyroxene with minor ilmenite. The presence of feldspathoids and lack of melilite are due to alteration that took place under oxidizing conditions as indicated by FeO‐ZnO‐rich spinel and ilmenite. The pre‐altered mineral assemblages are dominated by two types: one rich in melilite, referred to as type A‐like, and the other rich in spinel, referred to as spinelpyroxene inclusions. This study and previous data show similar type and size distributions of refractory inclusions in ordinary and enstatite chondrites.