Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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Spectroscopy of Skarn Minerals in Dangdu Pb-Zn Deposit and Assessment of Skarn Exploration Approaches Employing Portable Spectrometer

당두 연-아연 광상의 스카른 광물의 분광학적 특성과 휴대용 분광계의 스카른 탐사 가능성에 대한 고찰

  • Jeong, Yong Sik (Department of Geology and Earth Environmental Sciences, Chungnam National University) ;
  • Yu, Jaehyung (Department of Geology and Earth Environmental Sciences, Chungnam National University) ;
  • Koh, Sang-Mo (Mineral Resources Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Heo, Chul-Ho (Mineral Resources Division, Korea Institute of Geoscience and Mineral Resources)
  • 정용식 (충남대학교 지질환경과학과) ;
  • 유재형 (충남대학교 지질환경과학과) ;
  • 고상모 (한국지질자원연구원 광물자원연구본부 광물자원연구실) ;
  • 허철호 (한국지질자원연구원 광물자원연구본부 광물자원연구실)
  • Received : 2014.09.03
  • Accepted : 2014.09.20
  • Published : 2014.09.30
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Abstract

This study analyzed spectroscopic methods for characterization of skarn minerals and sphalerite occurring in Dangdu ore deposit, and effectiveness of portable spectrometer in skarn mineral resources exploration is discussed. The spectroscopic analyses identified clinopyroxene, garnet, epidote, calcite, chlorite and sphalerite where spectral curves of clinopyroxene, garnet, epidote, and sphalerite show single mineral spectral characteristics and those of chlorite are in a mixed form with calcite and clinopyroxene. The assessment of spectroscopic analyses based on XRD analysis and microscopic observation reveals that clinopyroxene, garnet, epidote correspond well with more than 80% of detection, but sphalerite, chlorite, and calcite showed below 50% of detection rate. It is expected that skarn deposit exploration using a portable spectrometer is more effective in detection of clinopyroxene, garnet, and epidote whereas spectroscopic data of sphalerite, chlorite, and calcite needs to be utilized as a supplementary data. For the effective detection of chlorite and calcite, their content in the samples needs to be sufficient.

당두광상에서 산출되는 스카른 광물 및 섬아연석에 대한 분광분석을 실시하고 XRD 분석 및 편광현미경 관찰을 통해 휴대용 분광계를 이용한 스카른 광상 광물자원탐사에 있어서 효율성에 대해 고찰하였다. 그 결과, 단사휘석(회철휘석, 투휘석, 보통휘석), 석류석(회철석류석, 회반석류석), 녹렴석, 방해석, 녹니석 및 섬아연석이 산출됨을 확인하였으며, 단사휘석, 석류석, 녹렴석, 섬아연석의 경우 해당 광물의 단일표준분광정보와 매우 일치하는 반면, 녹니석은 방해석 및 단사휘석과 혼합된 형태의 분광특성이 나타난다. 분광특성분석과 XRD 분석 및 현미경관찰을 통한 교차검증 결과, 단사휘석, 석류석, 녹렴석의 경우 80% 이상의 일치성을 보인 반면, 섬아연석, 녹니석, 방해석의 경우 50% 이하의 일치성을 보인다. 따라서 휴대용 분광계를 이용한 스카른 광상 탐사 시 단사휘석, 석류석, 녹렴석의 정보제공에 효과적인 반면, 섬아연석, 녹니석, 방해석의 경우 부수적인 자료로 활용하는 것이 적절할 것으로 생각된다. 녹니석이나 방해석의 경우 효과적인 탐지를 위해서는 충분한 함량이 뒷받침되어야 할 것이다.

Keywords

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