西北非洲5958：一个与CM有关的弱蚀变未分组球粒陨石，而不是CI3
Northwest Africa 5958: a weakly altered CM-related ungrouped chondrite, not a CI3
摘要：
西北非洲（Northwest Africa，NWA）5958是2009年在摩洛哥发现的碳质球粒陨石。初步的化学和同位素数据，导致其初步分类为C3.0未分组，促使我们进行了多技术研究，这颗陨石，并提出了一个一般性的描述。NWA 5958的岩相学和化学与CM球粒陨石最相似，具有低程度的水蚀变，显然是在氧化条件下，以及第二个有限蚀变事件的证据，表现为蚀变锋。氧同位素组成，$Δ^{17}$ O = -4.3 $\permil$，比所有CM辉长岩更富含16 O，这表明，与其他成分参数一起，一个单独的母体起源。我们建议将NWA 5958重新归类为与CM群有关的未分组碳质球粒陨石。
英文摘要：
Northwest Africa (NWA) 5958 is a carbonaceous chondrite found in Morocco in 2009. Preliminary chemical and isotopic data leading to its initial classification as C3.0 ungrouped have prompted us to conduct a multi-technique study of this meteorite and present a general description here. The petrography and chemistry of NWA 5958 is most similar to a CM chondrite, with a low degree of aqueous alteration, apparently under oxidizing conditions, and evidence of a second, limited alteration episode manifested by alteration fronts. The oxygen isotopic composition, with $Δ^{17}$O = -4.3 $\permil$, is more 16O-rich than all CM chondrites, indicating, along with other compositional arguments, a separate parent body of origin. We suggest that NWA 5958 be reclassified as an ungrouped carbonaceous chondrite related to the CM group.
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