Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Gravity Exploration Inferring the Source Granite of the NMC Moland Mine, Jecheon, Chungbuk

충북 제천 NMC 몰랜드 광산의 관계 화성암에 대한 중력탐사

  • Shin, Young Hong (Mineral Resource Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Yoo, Bong Chul (Mineral Resource Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Lim, Mutaek (Mineral Resource Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Park, Yeong-Sue (Mineral Resource Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Ko, In Se (Mineral Resource Research Division, Korea Institute of Geoscience and Mineral Resources)
  • 신영홍 (한국지질자원연구원 광물자원연구본부) ;
  • 유봉철 (한국지질자원연구원 광물자원연구본부) ;
  • 임무택 (한국지질자원연구원 광물자원연구본부) ;
  • 박영수 (한국지질자원연구원 광물자원연구본부) ;
  • 고인세 (한국지질자원연구원 광물자원연구본부)
  • Received : 2014.02.20
  • Accepted : 2014.04.23
  • Published : 2014.04.28
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Abstract

NMC Moland mine, which is classified as a contact replacement or skarn deposit, has been interpreted to have been formed by Daebo igneous activity which intruded into the Joseon Supergroup, because it is quite closely located to Jecheon granite. However, an alternative interpretation was recently suggested that the mine could be related with the hydrothermal fluid originated from Cretaceous granitic rocks, bringing about skarnization and Mo mineralization. Here we present an interpretation on the source granite of the mine based on the gravity exploration: the gravity anomaly, unlike the surface geology, shows that the Muamsa granite could be the related granite of the mine, because its hidden subsurface structure is expected to be more widely extended to surrounding area of the mine and deeper than the Jecheon granite.

NMC 몰랜드 광산은 고생대 조선누층군을 관입한 화성암류에 의해 형성된 접촉교대 또는 스카른 광상으로 공간적으로 제천화강암과 인접해 있어 이 화강암을 관계 화성암으로 간주하여 대보 화성 활동과 관련하여 형성된 광상으로 해석하였으나, 최근에는 백악기 천부 반화강암질 암체에서 기원된 광화유체로부터 스카른화작용과 더불어 Mo 광화작용이 진행된 것이라는 해석이 제시되었다. 본 연구에서는 광산 일원에 대한 중력탐사를 통해 지하구조를 해석함으로써, 지표 지질에서 제천화강암이 광산에 훨씬 인접한 것과는 달리 지하에서는 남쪽의 백악기 무암사화강암이 광산 하부와 주변으로까지 뻗어있을 것으로 여겨지며, 결과적으로 광상 형성의 관계 화성암으로 작용하였을 것임을 제시한다.

Keywords

References

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