Organic matter in carbonaceous chondrite lithologies of Almahata Sitta: Incorporation of previously unsampled carbonaceous chondrite lithologies into ureilitic regolith
Organic matter in carbonaceous chondrite lithologies of Almahata Sitta: Incorporation of previously unsampled carbonaceous chondrite lithologies into ureilitic regolith
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Almahata Sitta 碳质球粒陨石岩性中的有机物：将先前未取样的碳质球粒陨石岩性纳入脲质风化层中
DOI：
10.1111/maps.13713
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Sandfor
中科院分区：
文献类型：
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作者：
Kebukawa Yoko;Zolensky Michael. E.;Goodrich Cyrena A.;Ito Motoo;Ogawa Nanako O.;Takano Yoshinori;Ohkouchi Naohiko;Kiryu Kento;Igisu Motoko;Shibuya Takazo;Marcus Matthew A.;Ohigashi Takuji;Martinez James;Kodama Yu;Shaddad Muawia H.;Jenniskens Peter;Sandfor
Almahata Sitta （AhS）陨石是一种独特的多晶陨石。最近，在AhS中发现了碳质球粒岩岩性。有机质在原始碳质球粒陨石中普遍存在。这种有机质的分子和同位素特征反映了其起源和母体过程，对加热特别敏感。研究了AhS 671和AhS 91A的C1岩性，主要集中在OM上。我们发现这些岩性中的有机质是独特的，包含原始的同位素特征，但可能经历了短期加热事件的轻微加热。这些特征支持了一个或多个碳质球粒体被合并到育性母体中的观点。AhS样品中OM的独特性意味着太阳系中除了已知的原始碳质球粒陨石群（如CI， CM和CR球粒陨石）外，原始碳质球粒陨石物质存在很大变化。
The Almahata Sitta (AhS) meteorite is a unique polymict ureilite. Recently, carbonaceous chondritic lithologies were identified in AhS. Organic matter (OM) is ubiquitously found in primitive carbonaceous chondrites. The molecular and isotopic characteristics of this OM reflect its origin and parent body processes, and are particularly sensitive to heating. The C1 lithologies AhS 671 and AhS 91A were investigated, focusing mainly on the OM. We found that the OM in these lithologies is unique and contains primitive isotopic signatures, but experienced slight heating possibly by short‐term heating event(s). These characteristics support the idea that one or more carbonaceous chondritic bodies were incorporated into the ureilitic parent body. The uniqueness of the OM in the AhS samples implies that there were large variations in primitive carbonaceous chondritic materials in the solar system other than known primitive carbonaceous chondrite groups such as CI, CM, and CR chondrites.