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Thermal and shock metamorphic episodes of the Duwun L6 chondrite: Petrological evidence
최변각,Insoo Ahn,이민성,신홍자 한국지질과학협의회 2002 Geosciences Journal Vol.6 No.3
The Duwun meteorite fell on 23 November 1943 inDuwun-Myeon, Gohung-Gun, Jeonlanam-Do, Korea. Duwun isclassified as ordinary chondrite of L group and type 6. Duwunconsists of olivine, pyroxene, plagioclase, Fe-Ni metals, troilite,chromite and apatite. Relic chondrules with barred olivine, por-phyritic olivine, radial pyroxene and cryptocrysalline textures arefound. Thermometries using on compositions of pyroxene suggestthe recrystallization temperature of ~840oC. Various shock fea-tures recognized in Duwun include planar fractures and wavyextinction in olivine, occurrence of maskelynite, silicate darkeningand polycrystalline texture of kamacite. These observations sug-gest that the Duwun meteorite experienced shock stresses at S3 orS4 stages (~20 GPa).