Mineralogy, Petrology, and Classification of Types 3 and 4 Carbonaceous Chondrites
Mineralogy, Petrology, and Classification of Types 3 and 4 Carbonaceous Chondrites
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3 型和 4 型碳质球粒陨石的矿物学、岩石学和分类
DOI：
10.1007/978-94-010-3411-1_39
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发表时间：
1969
影响因子：
2.4
通讯作者：
W. R. Schmus
中科院分区：
文献类型：
--
作者：
W. R. Schmus
对 3 型和 4 型碳质球粒陨石的岩相学研究和微探针分析揭示了两种不同的亚型，暂时称为 Vigarano 亚型和 Ornans 亚型。亚型之间最明显的诊断区别是结构。属于维加拉诺亚型的球粒陨石的特征可能是具有大的（直径 1-2 毫米）“海绵状”球粒，嵌入丰富的、细粒的、不透明的基质中； “海绵状”球粒含有大量分散在硅酸盐球粒中的镍铁或硫化物球状液滴。属于 Ornans 亚型的球粒可被表征为小型（直径 0.2-0.5 毫米）贫金属球粒的密堆积聚集体，球粒之间填充有细粒、不透明的基质。
Petrographic studies and microprobe analyses on Type 3 and 4 carbonaceous chondrites reveal two distinct sub-types, provisionally called the Vigarano sub-type and the Ornans sub-type. The most obvious diagnostic distinction between the sub-types is textural. The chondrites belonging to the Vigarano sub-type may be characterized as having large (1–2 mm dia.) ‘spongy’ chondrules embedded in an abundant, fine-grained, opaque matrix; ‘spongy’ chondrules contain numerous spheroidal droplets of nickel-iron or sulfide dispersed throughout the silicate chondrule. The chon-drites belonging to the Ornans sub-type may be characterized as a close-packed aggregate of small (0.2–0.5 mm dia.) metal-poor chondrules with fine-grained, opaque matrix packed between the chondrules.