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NTIS 바로가기암석학회지 = The journal of the petrological society of korea, v.25 no.3, 2016년, pp.211 - 230
김만재 (강원대학교 지질.지구물리학부 지질학전공) , 이희권 (강원대학교 지질.지구물리학부 지질학전공)
Detailed mapping along the Keumwang fault reveals a complex history of multiple brittle reactivations following late Jurassic and early Cretaceous ductile shearing. The fault core consists of a 10~50 m thick fault gouge layer bounded by a 30~100 m thick damaged zone. The Pre-cambrian gneiss and Jura...
핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
단층이란 무엇인가? | 단층(fault)은 지각 10~15 km 이내의 깊이에서 취성 변형작용(brittle deformation)에 의해 형성되는 구조이다. 지각 10~15 km에는 취성-연성 전이대가 있으며, 이보다 더 깊은 곳에서는 연성 변형작용(ductile deformation)에 의해 연성전단대(ductile shear zone)가 형성된다(Fig. | |
금왕단층은 어떻게 구성되어 있는가? | 금왕단층(Keumwang fault)을 따라 실시한 자세한 지질조사를 통해 쥐라기 후기 및 백악기 초기에 발생한 연성 전단작용 이후에 취성단층 특징을 보이는 재활동이 여러 번 일어났음이 밝혀졌다. 금왕단층은 단층비지로 이루어진 약 10~50 m 폭의 단층핵과 이를 둘러싸고 있는 약 30~100 m 폭의 단층손상대로 이루어져 있다. 연구지역 내 선캠브리아 누대 편마암과 쥐라기 화강암 내에서는 서로 다른 변형환경, 변형시기, 변형기작에 의해 구별되는 최소 6단계의 단층운동이 관찰된다. | |
단층운동이나 전단 작용이 일어날 때 지각 깊이에 따라 어떤 단층암이 형성되는가? | 단층운동이나 전단작용이 일어날 때 지각 깊이에 따라 온도와 압력 조건 등이 달라지면서 다양한 종류의 단층암이 생성된다(Sibson, 1977). 지각 1~4 km보다 얕은 곳에서는 취성 변형작용이 우세하여 응집력이 없는 단층비지(fault gouge)나 단층각력암(fault breccia) 등이 형성되고, 지하 1~4 km 보다 깊고 10~15 km 보다 얕은 곳에서는 응집력이 있는 파쇄암 계열(cataclasite series)이 상부지각 내에 형성된다 (Sibson, 1977). 10~15 km 보다 깊은 곳에서는 연성 변형작용이 우세하여 연성전단대 내에 응집력이 있는 압쇄암 계열(mylonite series)이나 변성압쇄암(blastomylonite)이 중부지각 내에 형성된다(Fig. 1a; Ramsay, 1967; Sibson, 1977; Fossen, 2010). |
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