Olivine in terminal particles of Stardust aerogel tracks and analogous grains in chondrite matrix
Olivine in terminal particles of Stardust aerogel tracks and analogous grains in chondrite matrix
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DOI：
10.1016/j.gca.2014.05.037
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发表时间：
2014-10-01
影响因子：
5
通讯作者：
Le, Loan
中科院分区：
文献类型：
--
作者：
Frank, David R.;Zolensky, Michael E.;Le, Loan
到目前为止，缺乏球粒陨石基质中无水硅酸盐相的主元素和次元素分析，这阻碍了它们与Wild 2样品的比较。我们对星尘气凝胶轨迹粗颗粒末端颗粒中的橄榄石(Fa(0-97))进行了68次分析，并对分离于CI、CM、CR、CH、CO、Cv3-氧化、Cv3-还原、C3-未分组(Acfer094和宁强)、L/LL3.0-4、EH3和Kakangari球粒陨石基质中的类似橄榄石颗粒(5-30微米)进行了全面的数据集(>；10(3)分析)。这些成分表明，Wild 2可能聚集了各种各样的物质，这些物质是从不同的碳质和普通球粒陨石形成区径向输送的。野生2号橄榄石包括变形橄榄石集合体(Aoas)、难熔镁橄榄岩、I型和II型球粒碎屑和/或微球粒，以及稀有的残留颗粒成分。此外，我们还发现了一个在陨石记录中没有已知成分相似的终端粒子，它可能是柯伊伯带低温水处理的标志。星尘样品中富FeO橄榄石的铬含量普遍较低，表明它们经历了轻微的热变质作用，类似于岩石学品位3.05-3.15。(C)2014爱思唯尔有限公司。保留所有权利。
The dearth of both major and minor element analyses of anhydrous silicate phases in chondrite matrix has thus far hindered their comparison to the Wild 2 samples. We present 68 analyses of olivine ( Fa(0-97)) in the coarse-grained terminal particles of Stardust aerogel tracks and a comprehensive dataset (>10(3) analyses) of analogous olivine grains ( 5-30 mu m) isolated in CI, CM, CR, CH, CO, CV3-oxidized, CV3-reduced, C3-ungrouped (Acfer 094 and Ningqiang), L/LL 3.0-4, EH3, and Kakangari chondrite matrix. These compositions reveal that Wild 2 likely accreted a diverse assortment of material that was radially transported from various carbonaceous and ordinary chondrite-forming regions. The Wild 2 olivine includes amoeboid olivine aggregates (AOAs), refractory forsterite, type I and type II chondrule fragments and/or microchondrules, and rare relict grain compositions. In addition, we have identified one terminal particle that has no known compositional analog in the meteorite record and may be a signature of low-temperature, aqueous processing in the Kuiper Belt. The generally low Cr content of FeO-rich olivine in the Stardust samples indicates that they underwent mild thermal metamorphism, akin to a petrologic grade of 3.05-3.15. (C) 2014 Elsevier Ltd. All rights reserved.