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Type distribution pattern and pairing of ordinary chondrites from Grove Mountains, Antarctica

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Chinese Science Bulletin

Abstract

Twenty-eight meteorites were collected on blue ice in the Grove Mountains region, Antarctica, by the 16th Chinese Antarctic Research Expedition (CHINARE). 26 out of the stones are ordinary chondrites, and their chemical-petrographic types are assigned based on electron probe microanalyses, petrography and mineralogy. 6 of them are unequilibrated L-chondrites, and the other 20 chondrites are equilibrated, including 6 H-group (3 H4, 1 H5 and 2 H6), 9 L-group (3 L4, 1 L5 and 5 L6) and 5 LL-group (2 LL4 and 3 LL5). Detailed comparative study suggests that 10 of them (including other 2 chondrites collected by the 15th CHINARE) could be paired, and represent 5 individual fall events. Hence, all 32 meteorites collected from the Grove Mountains probably belong to 27 fall events, suggestive of meteorite transferring and concentrating processes. The Grove Mountains are likely a new meteorite-enriched region. Distribution patterns of chemical-petrographic type and mass of the Grove Mountains meteorites are significantly distinct from those found in other regions, indicative of their unique sources and/or concentration mechanism. However, more studies are required in order to clarify these differences.

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Authors and Affiliations

  1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China

    Bingkui Miao & Xinhua Zhou

  2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China

    Bingkui Miao & Yangting Lin

Authors
  1. Bingkui Miao
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  2. Yangting Lin
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  3. Xinhua Zhou
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Correspondence to Yangting Lin.

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Miao, B., Lin, Y. & Zhou, X. Type distribution pattern and pairing of ordinary chondrites from Grove Mountains, Antarctica. Chin.Sci.Bull. 48, 908–913 (2003). https://doi.org/10.1007/BF03325674

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  • DOI: https://doi.org/10.1007/BF03325674

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