Modal mineralogy of CI and CI-like chondrites by X-ray diffraction
Modal mineralogy of CI and CI-like chondrites by X-ray diffraction
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DOI：
10.1016/j.gca.2015.05.038
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发表时间：
2015-09-15
影响因子：
5
通讯作者：
Russell, S. S.
中科院分区：
文献类型：
--
作者：
King, A. J.;Schofield, P. F.;Russell, S. S.
CI球粒陨石是可供研究的水合程度最高的陨石之一，使其成为研究早期太阳系水成过程的理想样本。在这里，我们已经使用位置敏感探测器X射线衍射（PSD-XRD）来量化的CI球粒陨石福尔斯Alais，Orgueil和Ivuna，和南极CI类陨石Y-82162和Y-980115的散装样品中的矿物丰度。我们发现Alais、Orgueil和Ivuna主要由混合的蛇纹石/皂石层状硅酸盐（81-84体积%），加上少量的磁铁矿（6-10%）、硫化物（4-7%）和碳酸盐（500摄氏度）组成。类似地，Y-980115含有无序的蛇纹石/皂石（71体积%）、硫化物（19%）、橄榄石（8%）和磁铁矿（2%），证实它也是热变质的CI-样球粒陨石。我们认为，CI-类榴辉岩是来自不同的母体比CI榴辉岩，经历了短暂的热变质作用，由于影响和/或太阳辐射。(C)2015作者出版社：Elsevier Ltd
The CI chondrites are some of the most hydrated meteorites available to study, making them ideal samples with which to investigate aqueous processes in the early Solar System. Here, we have used position-sensitive-detector X-ray diffraction (PSD-XRD) to quantify the abundance of minerals in bulk samples of the CI chondrite falls Alais, Orgueil and Ivuna, and the Antarctic CI-like chondrites Y-82162 and Y-980115. We find that Alais, Orgueil and Ivuna are dominated by a mixed serpentine/saponite phyllosilicate (81-84 vol%), plus minor magnetite (6-10%), sulphides (4-7%) and carbonates (500 degrees C. Similarly, Y-980115 contains disordered serpentine/saponite (71 vol%), sulphide (19%), olivine (8%) and magnetite (2%), confirming that it too is a thermally metamorphosed CI-like chondrite. We suggest that the CI-like chondrites are derived from a different parent body than the CI chondrites, which underwent short-lived thermal metamorphism due to impacts and/or solar radiation. (C) 2015 The Authors. Published by Elsevier Ltd.