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NTIS 바로가기암석학회지 = The journal of the petrological society of korea, v.22 no.1, 2013년, pp.19 - 34
성창훈 (부산대학교 지질환경과학과) , 천영범 (부산대학교 지질환경과학과) , 손문 (부산대학교 지질환경과학과) , 손영관 (경상대학교 지구환경과학과) , 김진섭 (부산대학교 지질환경과학과)
The Ipcheon Subbasin is an isolated Miocene basin in SE Korea, which has the geometry of an asymmetric graben elongated in the NE-SW direction. It is in contact with basement rocks by faults and separated from adjacent Waup and Eoil basins by the basement. The strata of the basin fills have an overa...
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핵심어 | 질문 | 논문에서 추출한 답변 |
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동사구조의 특징을 보이는 퇴적층은 무엇을 나타내는가? | 둘째, 분지를 충전하고 있는 퇴적층들의 자세는 단층 또는 관입체에 의해 교란된 일부 지역을 제외하면 대부분이 북서 내지 서북서로 경동된 동사구조(homocline)의 특징을 보이며, 젊은 지층일수록 경사각이 얕아지는 경향이 나타난다. 이러한 특징은 남동쪽으로 경사진 정단층들이 분지의 확장을 주도하였음을 암시할 뿐만 아니라, 이 단층들이 퇴적동시성 단층임을 지시하고 있다(Son et al., 2000a, 2005; Kim et al. | |
분지지역의 특징은? | 지각변형의 주요 결과물인 퇴적분지의 진화사를 이해하기 위해서는 광역적인 지구조환경, 분지 내외에 발달하는 구조요소, 분지충전물의 퇴적환경 등의 분지 형성과 발달 과정을 반영하는 다양한 정보를 통한 총체적인 해석이 필요하다(Gawthorpe and Leeder, 2000; Allen and Allen, 2005). 또한 분지지역은 지구조적 열개작용에 의해 지각이 확장되어 많은 양의마그마 공급에 의한 활발한 화산활동이 일어나는 것이 특징적이다. 특히 단기간에 넓은 지역으로 퇴적되는 화산쇄설암은 분지충전물의 층서대비를 위한 열쇠층(key bed)으로 활용되기도 한다(Fisher and Schmincke, 1984; Cas and Wright, 1987; Miall, 1990). | |
장기통은 대부분 무엇으로 구성되어 있는가? | , 2005)의 지층으로, 연일통은 고생물 연구들을 통하여 전기 마이오세 말~중기 마이오세(Kim and Yoon, 1978; Byun, 1995; Yi and Yun, 1995)의 지층으로 확인되었다. 장기통은 대부분 산성 및 염기성 화산암류와 하성 및 호성 퇴적물들로 구성되며 오천단층계 이남의 분지들을 충전하고 있는 반면, 연일통은 화산물질을 포함하지 않은 해성 퇴적물로 구성되며 어일, 와읍, 정자 그리고 울산분지의 일부를 제외하면 대부분 포항분지를 충전한다. Tateiwa (1924)는 최초 장기통을 하부의 장기층군과 상부의 범곡리층군으로 구분하였으나, 두 층군의 명확한 정의가 세워져 있지 않고 단층 및 화산활동에 따른 분지 내부의 복잡성 때문에 연구자에 따라 두 층군의 선후관계가 현재까지 논란이 되고 있다. |
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