The Journal of the Petrological Society of Korea (암석학회지)

The Petrological Society of Korea (한국암석학회)
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A Petrological Study of the Mudeungsan Tuff Focused on Cheonwangbong and Anyangsan

천왕봉과 안양산을 중심으로 한 무등산응회암의 암석학적 연구

  • Jung, Woochul (Department of Energy and Resources Engineering, Chonnam National University) ;
  • Kil, Youngwoo (Department of Energy and Resources Engineering, Chonnam National University) ;
  • Huh, Min (Faculty of Earth Systems and Environmental Sciences, Chonnam National University)
  • 정우철 (전남대학교 에너지자원공학과) ;
  • 길영우 (전남대학교 에너지자원공학과) ;
  • 허민 (전남대학교 지구환경과학부)
  • Received : 2014.10.30
  • Accepted : 2014.11.25
  • Published : 2014.12.31
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Abstract

Even though Mesozoic Mudeungsan tuff, located within Neungju Basin, has been named several rock names, it should be named as Mudeungsan tuff due to several evidences, such as fiamme, welded texture and rock fragments in the Mudeungsan tuff. Volcanic eruption boundary between the Cheonwangbong and Anyangsan areas is not clear, but petrochemical and mineral chemical evidences with different ages indicate clear petrological boundary between Cheonwangbong and Anyangsan. The Mudeungsan tuffs from Cheonwangbong and Anyangsan is welded crystal tuff with dacitic composition and were generated from cogenetic calc-alkaline magma in the volcanic arc environment. Geochemical events indicate that magma beneath Cheonwangbong was seems to have been evolved from the magma beneath Anyangsan due to fractional crystallization dominated by plagioclase.

중생대 능주분지 내 형성된 무등산응회암은 기존에 여러 암석으로 명명되었으나, 무등산응회암 내 용결구조, 피아메, 암편, 기질의 탈유리화 등을 고려할 때, 무등산응회암이라는 통일된 명칭을 사용하는 것이 바람직하다. 천왕봉 지역과 안양산 지역 무등산응회암은 야외에서 경계가 뚜렷하지 않지만, 암석화학 및 광물화학적 특징과 연대측정 결과에 의해 천왕봉과 안양산 지역 무등산응회암으로 대분된다. 두 지역 무등산응회암은 섭입대 환경의 동원마그마에서 기원한 칼크-알카리 계열의 데사이트질 용결응회암이며, 결정질 응회암이다. 천왕봉 지역 무등산응회암은 안양산 지역 무등산응회암을 형성한 마그마에서 주로 사장석 정출에 의해 형성되었다.

Keywords

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