Systematics and Evaluation of Meteorite Classification
Systematics and Evaluation of Meteorite Classification
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DOI：
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发表时间：
2006
期刊：
影响因子：
13.6
通讯作者：
M. Weisberg;T. Mccoy;A. Krot
中科院分区：
文献类型：
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作者：
M. Weisberg;T. Mccoy;A. Krot
陨石的分类主要是基于它们的矿物学和岩相学特征以及它们的全岩化学和O-同位素组成。根据目前使用的分类方案，陨石分为陨石，原始无球粒陨石和无球粒陨石。其中碳质球粒陨石8组（CI、CM、CO、CV、CK、CR、CH、CB），普通球粒陨石3组（H、L、LL），顽火辉石2组（EH、EL），以及R、K球粒陨石。几个成员不能分配给现有的组，可以代表新组的第一个成员。有些陨石群又被细分为亚群，这可能是由一组陨石在小行星上的加工过程造成的。每个球粒陨石群被认为是一个单独的母体取样。一些球粒陨石群和未分组的球粒陨石显示出化学和矿物学上的相似性，并被分组为族。这一更高级分类的意义仍然知之甚少。原始的无球粒陨石包括钠长石、无球粒陨石、长角闪岩、winonaites和IAB和IIICD铁中的硅酸盐包裹体，可能代表重结晶或低程度部分熔融的碳酸盐物质的残留物。原始无球粒陨石和现存的陨石群之间的成因关系仍然存在争议。陨石是由陨石的高度熔化而形成的，包括小行星陨石（安格陨石、奥布里特陨石、霍华德陨石-闪长陨石-真长陨石、中长陨石、3组钯石、15组铁和许多未组合的铁）和行星陨石（火星、月球）。
Classification of meteorites is largely based on their mineralogical and petrographic characteristics and their whole-rock chemical and O-isotopic compositions. According to the currently used classification scheme, meteorites are divided into chondrites, primitive achondrites, and achondrites. There are 15 chondrite groups, including 8 carbonaceous (CI, CM, CO, CV, CK, CR, CH, CB), 3 ordinary (H, L, LL), 2 enstatite (EH, EL), and R and K chondrites. Several chondrites cannot be assigned to the existing groups and may represent the first members of new groups. Some groups are subdivided into subgroups, which may have resulted from asteroidal processing of a single group of meteorites. Each chondrite group is considered to have sampled a separate parent body. Some chondrite groups and ungrouped chondrites show chemical and mineralogical similarities and are grouped together into clans. The significance of this higher order of classification remains poorly understood. The primitive achondrites include ureilites, acapulcoites, lodranites, winonaites, and silicate inclusions in IAB and IIICD irons and probably represent recrystallization or residues from a low-degree partial melting of chondritic materials. The genetic relationship between primitive achondrites and the existing groups of chondritic meteorites remains controversial. Achondrites resulted from a high degree of melting of chondrites and include asteroidal (angrites, aubrites, howardites-diogenites-eucrites, mesosiderites, 3 groups of pallasites, 15 groups of irons plus many ungrouped irons) and planetary (martian, lunar) meteorites.