Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Preliminary Study of Oxidized Au skarn Model in the Geodo Mine Area to Mineral Exploration

광물자원탐사를 위한 거도광산지역의 산화형 스카른 금광상모델 예비연구

  • Kim, Eui-Jun (Geological Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Park, Maeng-Eon (Department of Environmental Geosciences, Pukyong National University) ;
  • Sung, Kyul-Youl (Department of Energy and Resources Engineering, Korea Maritime University)
  • 김의준 (한국지질자원연구원) ;
  • 박맹언 (부경대학교 환경지질과학과) ;
  • 성규열 (한국해양대학교 에너지자원공학과)
  • Published : 2009.08.28
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Abstract

The Geodo mine area, had been developed for Fe and Cu ores since 1963 and abandoned in recent decades, is located in the central part of the Taebaeksan mineralized district. This area comprises of the Jangsan, Myobong, Pungchon, Hwajeol, Dongjeom, and Dumugol Formations in ascending stratigraphic order. These Formations were intruded by the Cretaceous Eopyeong granitoids that appears to produce the Geodo skarn. Their compositions are relatively oxidized quartz monzodiorite to granodiorite (magnetite series, $Fe_2O_3/FeO=0.3{\sim}1.1$). Mineralizations related skarn deposit occur in the Myobong, Pungchon, and Hwajeol Formations. The proximal skarn is zoned from andraditic garnet ($Ad_{44-95}Gr_{1-53}$) predominant adjacent to the Eopyeong granitoids to diopsidic pyroxene ($Hd_{10-100}Di_{0-89}$) predominant away from the one. The differential proportion of garnet and pyroxene is generated by water/rock ratio and their source, such as magmatic and meteoric water. This is useful tool for assessment the overall oxidation state of the entire skarn system. Gold occurs in proximal red to brownish garnet skarn, and genetically associated with Bi- and Te-bearing minerals. Skarn deposit developed in the Geodo mine area is considered as oxidized Au skarn category, based on chemical composition of the Eopyeong granitoids, zonation of skarn, and gold occurrences. Garnet-rich skarn zone will be the main target for exploration of gold in the study area. However, it is needed to the detailed survey on vertical zonation of this area as well as lateral zonation. The result of this survey would provide an important basis for the exploration of the skarn Au deposit in the Geodo mine area.

태백산 광화대 중부에 위치한 거도광산은 최근 수 십년간 휴광상태이지만, 1963년부터 철과 동을 개발하였던 지역이다. 거도광산 지역은 장산규암, 묘봉층, 풍촌층, 화절층, 동점층 및 두무골층과 후기에 이를 관입한 백악기 어평화강 암체로 구성되어 있다. 거도 스카른을 형성시킨 어평화강암체의 조성은 상대적으로 산화된($Fe_2O_3/FeO=0.3{\sim}1.1$) 자철석계열의 석영몬조섬록암과 화강섬록암으로, 이들의 관입은 묘봉층, 풍촌층 및 화절층 내에 스카른 광화작용을 발달시켰다. 근지 외성 스카른은 어평화강암체 인근의 철이 부화된 안드라다이트(andradite) 석류석($Ad_{44-95}Gr_{1-53}$)이 우세한 지역에서 점차 멀어지면서 철이 결핍된 투휘석($Hd_{10-100}Di_{0-89}$)이 우세한 지역의 순으로 대상분포를 보인다. 이러한 석류석과 휘석의 다른 분포 특성은 모암의 조성 및 물/암석비 등의 차이에 기인된 것으로, 전체 스카른 시스템의 산화정도를 평가하는 중요한 요소이다. 거도광산의 금은 주로 근지의 적갈색 내지 갈색의 석류석이 우세한 스카른에서 산출되며, 성인적으로 함 비스무스-텔루륨 광물들과 밀접한 공생관계를 가진다. 거도광산의 금광작용과 관련된 관입암의 화학조성, 스카른대의 분포와 금의 산출특성 등은 산화형 스카른 금광상의 환경을 지시하며, 높은 석류석/휘석비를 갖는 스카른대가 탐사대상이 된다. 그러나 연구지역의 수평적 대상분포 외에 수직적 대상분포 특성에 대한 정밀탐사가 요구된다. 이는 거도광산 스카른대의 3차원적 이해를 가능하게 하며, 보다 체계적 탐사 및 구체적 개발 방안을 제시하는 중요한 기반을 제공할 것이다.

Keywords

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