암석학회지 (The Journal of the Petrological Society of Korea)

한국암석학회 (The Petrological Society of Korea)
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대자율이방성(AMS) 분석을 통한 석재 결의 파악: 거창 화강석에서의 사례 연구

Determination of Rock Cleavages Using AMS (Anisotropy of Magnetic Susceptibility): a Case Study on the Geochang Granite Stone, Korea

  • 조형성 (부산대학교 지질환경과학과) ;
  • 김종선 (부산대학교 지질환경과학과) ;
  • 김건기 ((재)거창화강석 연구센터) ;
  • 강무환 ((재)거창화강석 연구센터) ;
  • 손영관 (경상대학교 지질과학과) ;
  • 이윤수 (한국지질자원연구원) ;
  • 좌용주 (경상대학교 지질과학과) ;
  • 손문 (부산대학교 지질환경과학과)
  • Cho, Hyeongseong (Department of Geological Sciences, Pusan National University) ;
  • Kim, Jong-Sun (Department of Geological Sciences, Pusan National University) ;
  • Kim, Kun-Ki (Geochang Granite Research Center) ;
  • Kang, Moo-Hwan (Geochang Granite Research Center) ;
  • Sohn, Young Kwan (Department of Geological Sciences, Gyeongsang National University) ;
  • Lee, Youn Soo (Korea Institute of Geoscience and Mineral Resources) ;
  • Jwa, Yong-Joo (Department of Geological Sciences, Gyeongsang National University) ;
  • Son, Moon (Department of Geological Sciences, Pusan National University)
  • 투고 : 2015.07.15
  • 심사 : 2015.08.26
  • 발행 : 2015.09.30
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초록

화강암 석산에서는 '결'이라고 지칭되는 분리되기 용이한 면을 따라 채석이 이루어진다. 이러한 결의 방향성과 발달 특징은 채석의 효율성과 관련되므로 석산에서 채굴방향을 결정함에 있어 고려해야할 가장 중요한 요인이다. 이번 연구에서는 한반도 남부 거창지역에 분포하는 화강암 석산(JS기업, SD개발, AR석재, GD산업, BW무역, MD기업사)들을 대상으로 대자율이방성 방법을 적용하여 석재의 자기미세구조를 해석하였으며, 이로부터 석재 결과의 연관성 및 파악방법에 대해 논의하였다. 평균대자율 분석, 고온대자율 실험 그리고 자기이력곡선 분석 결과, 화강암 석재의 대자율이방성을 지배하는 주자성광물은 티탄함량이 적은 다자구 및 위단자구의 자철석으로 해석된다. 대자율이방성 측정 결과, 6개 석산 모두에서 체계적인 방향성의 자기엽리구조가 발달하며, 자기엽리구조는 대부분 거의 수직에 가까운 고각의 경사를 가진다. 자기엽리구조는 대부분 석산에서 석재의 2번 결과 매우 유사한 방향성을 보인다. 예외적으로 다른 석산에 비해 $P_J$ 값이 높아 미세구조의 발달이 현저한 BW무역에서의 자기엽리구조는 1번 결과 거의 평행하다. 이상의 결과들은 화강암 석재의 결은 광물결정들의 모양 및 배열상태, 즉 암석미세구조와 밀접하게 관련됨을 지시하고 있어, 대자율이방성을 이용한 자기미세구조 분석은 석재 결의 방향성을 측정하는 정량적이고 효과적인 하나의 방법이 될 수 있음을 알려준다.

In granite quarry, stones are generally quarried along easily separating planes called as 'rock cleavage'. Because orientation and characteristics of the rock cleavage are directly involved with easy quarrying, it is the most important factor on selecting a direction of digging. Using AMS (anisotropy of magnetic susceptibility), we attempt to interpret rock fabrics in Geochang Granite Stone (JS, SD, AR, GD, BW, MD quarry) and discuss about determination of rock cleavages and correlation between the rock fabrics and cleavages. Based on mean susceptibility, thermo-susceptibility curves, and hysteresis parameters, Ti-poor MD and/or PSD magnetites are the main contributor to AMS of the granite stones. The systematic magnetic foliations with sub-vertical dip angle are developed in the whole granite quarries. In most of the granite quarries, the magnetic foliations are significantly consistent with grain plane. In the BW quarry, which has higher $P_J$ values than the others, the magnetic foliations coincide exceptionally with rift plane. These results suggest that rock cleavages in granite stone are related to rock fabrics meaning shape and spatial arrangement of crystals. Magnetic fabrics analysis using AMS method, therefore, can be a quantitative and effective tool for determination of rock cleavages in granite quarry.

키워드

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피인용 문헌

  1. Editorial : 2015, Applied petrology: Dimension stone, Aggregate, Stone cultural heritage vol.24, pp.3, 2015, https://doi.org/10.7854/JPSK.2015.24.3.149