Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Hydrothermal System of Diaspore-Dumortierite Minerals from Korea

다이야스포아-듀모오티어라이트 광물의 열수생성 과정

  • Sang, Ki-Nam (Department of Earth Environmental Science, Pukyong University) ;
  • Chung, Won-Woo (Science Education Research Institute, Kyungpook National University) ;
  • Lee, Yoon-Jong (Department of Earth Science, Kyungpook National University)
  • 상기남 (부경대학교 지구환경과학부) ;
  • 정원우 (경북대학교 사범대학 과학교육연구소) ;
  • 이윤종 (경북대학교 사범대학 지구과학교육과)
  • Received : 1995.11.22
  • Published : 1996.08.30
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Abstract

Clay minerals are locally abundant in two hydrothermal areas at Tongnae-Yangsan and Miryang, Gyong-sang-namdo, Korea. This study is done to access the clay forming processes, particularly hydrothermal alteration. Pyrophyllite-kaolin in the Zone is accompanied by sericite, diaspore mixed-layer mica/smectite, alunite, dumortierite and silica minerals. Small nodular diaspore and disseminated fine radiac dumortierite are present in the pyrophyllite-kaoline deposits, the northemly trending belt of rhyolite flows and pyroclastic rock near the intruded by granite rock of Bulkusa Series. Hydrothermal action has formed many clay deposits with a zone containing over 80~90% pyrophyllite, kaolinite, muscovite with a little amount of dumortierite, boehmite, andalusite. Most of the clay deposits occur as irregular, lenticular, massive and assosiated dumortierite was found to coexist with clay deposits. Dumortierite data are as follows: lattice constant a=11.783, b=20.209, c=4,7001, axial ratio a:b:c=0.5835 : 1 : 0.2327, XRD $d{\AA}$ 2.549, 5.89, 5.09.

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