자원환경지질 (Economic and Environmental Geology)

  • 제54권6호
  • /
  • Pages.615-627
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  • 2021
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  • 1225-7281(pISSN)
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  • 2288-7962(eISSN)
대한자원환경지질학회 (The Korean Society of Economic and Environmental Geology)
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단열계의 발달 및 연결성 제어요소: 고흥지역 백일도단층의 예

Controlling Factors on the Development and Connectivity of Fracture Network: An Example from the Baekildo Fault in the Goheung Area

  • Park, Chae-Eun (Department of Geology, Kyungpook National University) ;
  • Park, Seung-Ik (Department of Geology, Kyungpook National University)
  • 투고 : 2021.12.02
  • 심사 : 2021.12.19
  • 발행 : 2021.12.28
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⟨ 이전 논문 다음 논문 ⟩

초록

전라남도 고흥군 백일도에 발달하는 우수향 주향이동 단층인 백일도단층은 응회질 사암과 화산력응회암의 분포를 규제하며 복잡한 단열계를 수반한다. 본 연구에서는 백일도단층 주변의 상세 단열 지도를 기반으로 원조사법 및 위상기하 분석법을 통해 단열계의 기하 및 연결성의 공간적 변화를 파악하였다. 분석 결과 단열계의 밀도와 연결성은 화산력응회암에서보다 응회질 사암에서 더욱 높게 나타난다. 응회암질 사암 내 단층의 주향에 대한 구조적 위치에 따라 단열군의 방향 분산도, 밀도, 그리고 평균 길이가 변화한다. 또한 단층 굴곡 주변에는 단층과 고각을 이루거나 휘어진 단열이 집중되어 발달한다. 상세한 단열 관찰과 분석을 통해 본 연구에서는 다음과 같은 결론을 도출하였다. (1) 응회질 사암 내 단열계의 높은 밀도는 석영, 장석과 같은 취성 광물의 높은 비율에 의해 제어된다. (2) 단열계의 연결성은 구조적 위치에 따른 단열군 방향의 다양화 및 연장성의 증가에 의해 향상된다. (3) 불규칙한 기하를 가진 단층 굴곡은 단층 주변의 응력을 집중 및 교란시켜 단층과 고각을 이루거나 휘어진 단열을 발생시킨다. 연구 결과는 단층 주변 단열계의 발달을 제어하는 여러 지질학적, 구조적 요인에 대한 이해를 증진시키는 데에 도움이 될 것으로 기대된다.

The Baekildo fault, a dextral strike-slip fault developed in Baekil Island, Goheung-gun, controls the distribution of tuffaceous sandstone and lapilli tuff and shows a complex fracture system around it. In this study, we examined the spatial variation in the geometry and connectivity of the fracture system by using circular sampling and topological analysis based on a detailed fracture trace map. As a result, both intensity and connectivity of the fracture system are higher in tuffaceous sandstone than in lapilli tuff. Furthermore, the degree of the orientation dispersion, intensity, and average length of fracture sets vary depending on the along-strike variation in structural position in the tuffaceous sandstone. Notably, curved fractures abutting the fault at a high angle occur at a fault bend. Based on the detailed observation and analyses of the fracture system, we conclude as follows: (1) the high intensity of the fracture system in the tuffaceous sandstone is caused by the higher content of brittle minerals such as quartz and feldspar. (2) the connectivity of the fracture system gets higher with the increase in the diversity and average length of the fracture sets. Finally, (3) the fault bend with geometric irregularity is interpreted to concentrate and disturb the local stress leading to the curved fractures abutting the fault at a high angle. This contribution will provide important insight into various geologic and structural factors that control the development of fracture systems around faults.

키워드

과제정보

이 연구는 한국연구재단 신진연구지원사업(2018R1C1B6003851)에 의해 지원되었으며, 더불어 2021년도 정부(산업통상자원부)의 재원으로 해외자원개발협회의 지원을 받아 수행되었다(데어터사이언스 기반 석유·가스 탐사 컨소시엄). 결과의 일부는 박채은 학부졸업논문 연구의 일환으로 도출되었다. 논문의 질적 향상을 위해 유익한 조언을 주신 두 익명의 심사위원께 감사를 표한다.

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