极地研究

极地研究 ›› 2012, Vol. 23 ›› Issue (1-English): 25-29.DOI: 10.3724/SP.J.1085.2012.00025

• 研究论文 • 上一篇    下一篇

Grove Mountains (GRV) 024237: A New Ureilite from Antarctica

  

  • 收稿日期:2011-08-11 修回日期:2011-09-16 出版日期:1962-03-30 发布日期:1962-03-30

Grove Mountains (GRV) 024237: A New Ureilite from Antarctica

JIANG Xiaoying1,2,WANG Guiqin 1,WANG Daode1 & MIAO Bingkui3   

  1. 1 State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences,
    2Graduate University of Chinese Academy of Sciences;
    3 Key Laboratory of Geological Engineering Center of Guangxi Province, Guilin University of Technology
  • Received:2011-08-11 Revised:2011-09-16 Online:1962-03-30 Published:1962-03-30
  • Contact: WANG Guiqin
  • Supported by:

    the Pilot Project of Knowledge Innovation Program of the Chinese Academy of Sciences;the National Natural Science Foundations of China;Knowledge Innovation Program of the Chinese Academy of Sciences;the project of International Polar Year, Action Plan for China;the project of China Polar Research Strategy Fund

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Abstract:

Ureilite, a special group of achondrites, has both the characteristics of differentiated meteorites and those of primary chondrites. GRV 024237 is an ureilite which was found in the 19th Chinese Antarctic Research Expedition (CHINARE), at the No.4 moraine, Grove Mountains, Antarctica. GRV 024237 mainly consists of coarse granular assemblages of olivine (60 vol%), pigeonite (30 vol%) and opaque mineral (10 vol%). Black grain boundaries are filled by carbonaceous material with a trace of troilite and nickel-iron metal, and 120°junctions are common. The Fa of olivine composition varies from 6.2 to 16.77 from its rim to core, but pyroxene is uniform in composition with Fs 14.0 to 15.5. The opaque phases are mainly graphite, troilite and Fe-Ni metal. GRV 024237 has normal extinction, net-like iron or limonite veins, no diamond and moderate FeO /MgO（Fo 84.8/Fa15.2）ratio. According to different model for sub-group classification, GRV 024237 is a typical monomict ureilite，and it belongs type I and group 2.

Key words: Antarctic meteorite, ureilite, petrology, chemical composition, classification