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Review on the Triassic Post-collisional Magmatism in the Qinling Collision Belt

친링 충돌대의 트라이아스기 충돌 후 화성작용에 대한 리뷰

  • Oh, Chang Whan (Department of Earth and Environmental Sciences & Basic Science Research Institute, Chonbuk National University) ;
  • Lee, Byung Choon (Department of Earth and Environmental Sciences & Basic Science Research Institute, Chonbuk National University) ;
  • Yi, Sang-Bong (Department of Earth and Environmental Sciences & Basic Science Research Institute, Chonbuk National University) ;
  • Zhang, Cheng Li (Department of Geology, Northwest University)
  • 오창환 (전북대학교 지구환경과학과, 전북대 지구환경시스템 연구소) ;
  • 이병춘 (전북대학교 지구환경과학과, 전북대 지구환경시스템 연구소) ;
  • 이상봉 (전북대학교 지구환경과학과, 전북대 지구환경시스템 연구소) ;
  • Received : 2014.08.04
  • Accepted : 2014.12.13
  • Published : 2014.12.31

Abstract

The Qinling-Dabie-Sulu-Hongseong-Odesan collision belt was formed by the collision between the North China and South China Cratons during late Permian to Triassic. During the collision, Triassic post-collision igneous rocks regionally intruded in the Qinling and the Hongseong-Odesan collision belts which represent the western and eastern ends of the collision belt, respectively. However, no and minor Triassic post-collision igneous activities occur in the Dabie and Sulu belts respectively. The peak metamorphic pressure conditions along the Qinling-Dabie-Sulu-Hongseong-Odesan belt indicate that the slab break-off occurred at the depth of ultra-high pressure (UHP) metamorphic condition in the Dabie and Sulu belts and at the depths of high pressure (HP) or high pressure granulite (HPG) metamorphic condition in the Qinling and Hongseong-Odesan belts. In the Dabie and Sulu belts the heat supply from the asthenospheric mantle through the gab formed by slab break-off could not cause an extensive melting in the lower continental crust and lithospheric mantle directly below it due to the very deep depth of slab break-off. On the other hand, in the Qinling and Hongseong-Odesan belts, shallower slab break-off caused the emplacement of regional post collision igneous rocks. The post-collision igneous rocks occur in the area to the north of the Mianlu Suture zone in the western Qinling belt and crop out continuously eastwards into the areas to the north of the Shangdan Suture zone in the eastern Qinling belt through the areas within the South Qinling block. This distribution pattern of post collision igneous rocks suggests that the Triassic collision belt in the Mianleu Suture zone may be extended into the Shangdan Suture zone after passing through the South Qinling block instead into the boundary between the South Qinling block and the South China Craton.

북중국판과 남중국판이 페름기말-트라이아스기에 충돌하여 친링-다비-수루-홍성-오대산 대륙충돌대가 형성되었고 트라이아스기 충돌 후 화성암들이 충돌대의 서쪽 끝 부분인 친링 충돌대 지역에 광역적으로 형성되었다. 그리고 충돌대의 동쪽 끝 부분인 홍성-오대산 지역에도 광역적인 트라이아스기 충돌 후 화성암이 형성되었다. 하지만 다비 지역에서는 트라이아스기 충돌 후 화성암이 나타나지 않고 수루 지역에서는 매우 소규모로 형성되었다. 친링-다비-수루-홍성-오대산 충돌대를 따라 일어난 최고 변성 압력 조건을 고려하여 보면 다비-수루 충돌대에서는 초고압 에클로자이트 변성상에 해당하는 매우 깊은 지역에서 섭입판 분리가 일어난데 반해 친링 서측과 홍성-오대산 충돌대 지역에서는 에클로자이트상 내지 고압 백립암상의 변성상에 해당하는 상대적으로 낮은 지역에서 섭입판 분리가 일어난 것으로 유추될 수 있다. 그 결과 다비-수루 지역에서는 섭입판 분리에 의해 형성된 공간을 통해 유입되는 연약권 맨틀에 의한 열 효과가 매우 깊은 곳에서 일어나 그 위에 존재하는 대륙지각과 그 직하부 맨틀에 큰 영향을 주지 못해 매우 제한적인 충돌 후 화성암이 나타나거나 전혀 나타나지 않는 것으로 판단된다. 이에 비해 섭입판 분리가 상대적으로 낮은 깊이에서 일어난 홍성-오대산 지역과 친링 지역에서는 유입되는 연약권 맨틀에 의한 열 효과가 그 위에 존재하는 대륙지각과 그 직하부 암권 맨틀에 영향을 주어 광범위한 충돌 후 화성암을 형성한 것으로 생각된다. 친링지역의 트라이아스기 충돌 후 화성암은 친링 지역 서부에서는 미얀루 충돌대 북쪽에서 나타나며 동쪽으로 가면서 남친링 소대륙판 내부에 나타나다가 친링 지역 동부에서는 샹단 충돌대 북쪽에 나타난다. 이러한 트라이아스기 충돌 후 화성암의 분포는 트라이아스기 충돌대가 미얀루 충돌대 이후 남중국판과 남친링 소대륙판 경계를 따라 연장되기 보다는 충돌 후 화성암의 남쪽 경계를 따라 북서쪽으로 연장되어 샹단 충돌대로 연결될 가능성이 높음을 지시한다.

Keywords

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