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Thermal and shock metamorphic episodes of the Duwun L6 chondrite: Petrological evidence

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Abstract

The Duwun meteorite fell on 23 November 1943 in Duwun-Myeon, Gohung-Gun, Jeonlanam-Do, Korea. Duwun is classified as ordinary chondrite of L group and type 6. Duwun consists of olivine, pyroxene, plagioclase, Fe−Ni metals, troilite, chromite and apatite. Relic chondrules with barred olivine, porphyritic olivine, radial pyroxene and cryptocrysalline textures are found. Thermometries using on compositions of pyroxene suggest the recrystallization temperature of ≈840°C. Various shock features recognized in Duwun include planar fractures and wavy extinction in olivine, occurrence of maskelynite, silicate darkening and polycrystalline texture of kamacite. These observations suggest that the Duwun meteorite experienced shock stresses at S3 or S4 stages (≈20 GPa).

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Authors and Affiliations

  1. Department of Earth Science Education, Seoul National University, 151-748, Seoul, Korea

    Byeon-Gak Choi, Insoo Ahn & Min Sung Lee

  2. Geology Division, Korea Institute of Geoscience and Mineral Resources, 305-350, Daejeon, Korea

    Hong-Ja Shin

Authors
  1. Byeon-Gak Choi
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  2. Insoo Ahn
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  3. Min Sung Lee
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  4. Hong-Ja Shin
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Correspondence to Byeon-Gak Choi.

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Choi, BG., Ahn, I., Lee, M.S. et al. Thermal and shock metamorphic episodes of the Duwun L6 chondrite: Petrological evidence. Geosci J 6, 161–167 (2002). https://doi.org/10.1007/BF02912685

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  • DOI: https://doi.org/10.1007/BF02912685

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