机构地区: 中国科学院地球化学研究所
出 处: 《极地研究》 2008年第2期177-188,共12页
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。 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.