极地研究

极地研究 ›› 2008, Vol. 20 ›› Issue (2): 177-188.

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100块南极格罗夫山陨石的类型划分及其岩石学特征

李世杰;王世杰;刘燊;李雄耀;唐红;李芃;王涛;   

  • 出版日期:2008-06-30 发布日期:2008-06-30

THE CLASSIFICATION OF 100 GROVE MOUNTAINS ORDINARY METEORITES

  • Online:2008-06-30 Published:2008-06-30

PDF (PC)

1683

被引次数

9

摘要：

根据岩石矿物学研究,包括岩石结构、橄榄石的Fa值和低钙辉石的Fs值以及金属模式含量等,100块格罗夫山陨石分别被划分为:4块H3型、11块H4型(其中一块为H4-an)、10块H5型、3块H6型、2块L3型、6块L4型、31块L5型、32块L6型和1块LL4型。格罗夫山普通球粒陨石在类型分布上,其比例和南极以及非南极普通球粒陨石有显著不同,说明可能存在相当数量的成对陨石。分类陨石样品比较新鲜,其中98块陨石的风化程度为W1,仅有2块陨石风化程度分别为W2和W3。另外,这些陨石中冲击程度较高的样品占有一定比例,它们是研究冲击作用的理想样品。

关键词: 格罗夫山;南极陨石;普通球粒陨石;类型划分

Abstract:

Classification of ordinary chondrites based on mean Fa and Fs value of olivine and Low-Ca pyroxene respectively is effective.By using this method,these 100 ordinary chondrites are classified into chemical groups of H(include 1 H-au),L and LL.According to some petrographic criteria under optical microscope,these meteorites belong to the following chemical-petrographic types: 4 H3,11 H4(including 1 H4-an),10 H5,3 H6,2 L3,6 L4,31 L5,32 L6 and 1 LL4.Compared with the Antarctic and non-Antarctic ordinary chondrites,ordinary chondrites from Grove Mountains have significant differences in chemical-petrologic distribution mode.That maybe indicates the presence of a member of paired meteorites.Weathering degree of these meteorites is slight,and shock effects are showed in all the types but the S6.