ADVANCES IN POLAR SCIENCE ›› 2008, Vol. 20 ›› Issue (2): 177-188.

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THE CLASSIFICATION OF 100 GROVE MOUNTAINS ORDINARY METEORITES

  

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

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.