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NTIS 바로가기자원환경지질 = Economic and environmental geology, v.52 no.5, 2019년, pp.337 - 345
이창열 (연세대학교 지구시스템과학과)
The hypothesis of ridge subduction which explains the Cretaceous igneous activities in East Asia including China, Korea and Japan, has been widely accepted in the society. Especially, the hypothesis explains the southwest-to-northeast migration of the Cretaceous adakite emergence in Southwest Japan....
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핵심어 | 질문 | 논문에서 추출한 답변 |
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쥬라기-백악기 시기 동아시아 지구조의 구성요소는 무엇인가? | 쥬라기-백악기 시기 동아시아의 지구조는 크게 양쯔지괴(Yangtze Craton)와 남동중국 습곡계(Southeast China Fold System)를 포함하는 남중국지괴(South China Craton)와 북중국지괴(North China Craton),그리고 이 두 지괴의 충돌에 의해 형성된 친링-다비-술루 충돌대(Qingling-Dabie-Sulu Belt), 한반도 그리고 현재의 일본 열도로 구성된 대륙 지각들과 이 대륙 지각 하부에 섭입(subduction)한 이자나기 판(Izanagi Plate)으로 구성되어 있다(Figure 1). 따라서 이 지구조 중심에 위치한 한반도의 지구조사를 이해하는 것은 중국 및 일본 지각으로 경계지어진 동아시아 지구조사를 이해하는데 중요하다. | |
해령 섭입 가설이란 무엇인가? | , 1997)(Figure 2). 해령 섭입 가설은 쥬라기 후기부터 백악기 후기까지 현재의 남동중국에서 연해주까지 이르는 과거 섭입대를 따라 이자나기 판과 태평양 판의 발산 경계인 해령이 수직으로 섭입하면서 북동 방향을 따라 이동하였다는 가설이다(Maruyama et al., 1997). | |
해령 섭입의 존재에 대한 의문을 제시하는 판재구성 모델은 무엇인가? | , 2012; Sdrolias and Müller, 2006)은 백악기 동아시아에서 발생한 해령 섭입의 존재 자체에 대한 의문을 제시하였다. 판재구성 모델에 따르면, 백악기 시기 이자나기 판이 동아시아 대륙 주변부를 따라 섭입하였으며 태평양 판과 경계지어진 해령은 백악기 최후기와 신생대 초기에 동아시아 섭입대 전체에 걸쳐 섭입하였음이 제시되었다. 이는 해령 섭입 가설을 부정하는 것으로써 동아시아 지구조사를 다른 관점에서 재해석해야함을 지시한다. |
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