THE STUDY OF AND EXPECTATIONS FOR FINDING CARBONACEOUS CHONDRITES IN THE GROVE MOUNTAINS, ANTARCTICA

doi:10.3724/SP.J.1084.2013.00378

Abstract

Abstract: Petrography and mineral chemistry of 3 carbonaceous chondrites (GRV 020025, 021579 and 022459) collected from the Grove Mountains (GRV), Antarctica, were reported here. All 3 chondrites are unequilibrated.The modal abundance ratio of matrix/chondrule are 2.8 (GRV 020025), 1.2 (GRV 021579) and 1 (GRV 022459). GRV 022459 has the largest chondrules (0.6-2.0 mm). A total 27 Ca-, Al-rich inclusions have been found in the three chondrites. Except for one spinel-spherule in each GRV 020025 and 021579, all other inclusions can be classified as Type A (or Type A-like) or spinel-pyroxene-rich inclusions. Most of the inclusions are intensively altered, with abundant phyllosilicates in the inclusions from GRV 020025 and FeO-enrichment of spinel in GRV 022459. At last, we look forward to the step studying work of Antarctica carbonaceous chondrites.

Key words: petrography and mineral chemistry, Ca-, Al-rich inclusions, carbonaceous chondrites, Antarctica

DAI Deqiu，CHEN Xinyue，Yang Rongfeng. THE STUDY OF AND EXPECTATIONS FOR FINDING CARBONACEOUS CHONDRITES IN THE GROVE MOUNTAINS, ANTARCTICA[J]. ADVANCES IN POLAR SCIENCE, 2013, 25(4): 378-385.

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