Chinese Journal of Polar Research

ADVANCES IN POLAR SCIENCE ›› 2009, Vol. 20 ›› Issue (2-English): 166-171.

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Petrography and mineral chemistry of 4 carbonaceous chondrites from the Grove Mountains, Antarctica

 Dai Deqiu1 and Wang Daode2   

  1. 1 Institute of Geology, Hunan University of Science and Technology, Xiangtan 411201, China;
    2 Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
  • Online:1959-06-30 Published:1959-06-30
  • Contact: Dai Deqiu

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Abstract:

Petrography and mineral chemistry of four carbonaceous chondrites ( GRV 020017, GRV 020025, GRV 021579, GRV 022459) collected from the Grove Mountains ( GRV ), Antarctica, were reported here. All four chondrites are unequilib rated, as indicated by well shaped chondrules and the chemical variations of olivine and low-Capyroxene. The modal abundance ratio of matrix/chondrule are 2 ( GRV 020017), 2. 8 ( GRV 020025), 1. 2 ( GRV 021579 ), 1 ( GRV 022459 ). GRV 022459 has the largest chondrules( 0.6-2.0mm). A total of 30 Ca-Al-rich inclusions were found in the four meteorites. Most inclusions were highly altered, with abundant phyllos ilicates in the inclusions of GRV 020017 and GRV 020025. On the base of petrography and mineral chemistry, these chondrites are classified as CM 2 ( GRV 020017 and 020025), CO 3 ( GRV 021579) and CV 3 ( GRV 022459).

Key words: carbaonaceous chondrites, petrography and mineral chemistry, CAI, classification, Antarctica