Geophysics and Geophysical Exploration (지구물리와물리탐사)

Korean Society of Earth and Exploration Geophysicists (한국지구물리·물리탐사학회)
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Characterization of Physical Properties for Mineral Exploration of High-grade Limestone in Pungchon Formation

풍촌층 고품위 석회석 광상 탐사를 위한 암석 물성 특성

  • Shin, Seung Wook (Mineral Resources Development Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Park, Samgyu (Mineral Resources Development Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Cho, Seoung-Jun (Mineral Resources Development Research Center, Korea Institute of Geoscience and Mineral Resources)
  • 신승욱 (한국지질자원연구원 자원탐사개발연구센터) ;
  • 박삼규 (한국지질자원연구원 자원탐사개발연구센터) ;
  • 조성준 (한국지질자원연구원 자원탐사개발연구센터)
  • Received : 2017.06.12
  • Accepted : 2017.07.03
  • Published : 2017.08.31
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Abstract

High-grade limestone applied to various chemical industries is abundant within upper Pungchon formation in Taebaeksan basin, South Korea. Geophysical exploration is one of the most efficient methods to investigate subsurface geological structure in an extensive area. Since the geophysical exploration for the high-grade limestone has rarely been conducted in Korea, its appropriate strategy has not been set up yet. In this study, we focused on to suggest the reasonable strategy and accumulate geophysical databases which are essential for interpreting geophysical images by characterizing laboratory physical properties of in-situ rocks. Hence, rocks were obtained from drilled cores consisting of lower Hwajeol formation, Pungchon formation, and dykes in Jeongseon area, Gangwon province. Geophysical laboratory experiments and petrography of the rocks were conducted. Since susceptibility values of the rocks in Pungchon Formation were obviously lower than those of upper Hwajeol and dykes, it is considered that the lithological boundaries could be distinguished by magnetic survey. In addition, electrical properties of the rocks in middle Pungchon formation were relatively different compared with those of upper/lower Pungchon formations. Thus, induced polarization is shown to be able to detect the high-grade limestone in upper Pungchon formation.

다양한 화학산업에서 사용되는 고품위 석회석은 국내 태백산 분지 일대 상부 풍촌층에 분포하고 있다. 물리탐사는 광범위한 지표면 아래의 지질구조를 조사하는데 가장 효율적인 방법이다. 고품위 석회석 조사와 관련된 물리탐사 연구사례가 거의 선행되지 않았으므로 석회석 조사에 적절한 탐사전략이 아직 마련되지 않았다. 따라서 이 연구에서 암상별 물성연구를 바탕으로 최적의 고품위 석회석 탐사방법을 제안하고, 탐사결과 해석에서 필요한 데이터베이스를 축적하는데 초점을 두었다. 연구를 위한 암석시료는 정선 일대 하부 화절층, 풍촌층, 암맥류를 대상으로 현장 시추 코어에서 채취했고, 실내 물성 측정과 암석 기재를 수행했다. 풍촌층 암석의 대자율은 하부 화절층과 암맥보다 확연히 낮으므로 이러한 암상 경계는 자력 탐사로 구분할 수 있을 것으로 보인다. 또한, 중부 풍촌층 암석의 전기적 물성, 특히 충전성은 상부/하부 풍촌층과 비교하면 차이가 나므로 상부 풍촌층의 고품위 석회석은 유도분극 탐사로 찾을 수 있을 것으로 판단했다.

Keywords

References

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