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NTIS 바로가기암석학회지 = The journal of the petrological society of korea, v.23 no.1, 2014년, pp.17 - 30
하영지 (부경대학교 일반대학원 지구환경시스템과학부 지구환경과학전공) , 송용선 (부경대학교 환경해양대학 지구환경과학과) , 김정민 (한국기초과학지원연구원 환경지질연구부)
In this study we carried out SHRIMP U-Pb age dating of detrital zircons from age-unknown meta-sedimentary formations distributed around the NNE-SSW trending Gwangju Shear Zone, a branch of Honam Shear Zone, in the southwestern region of the Korean Peninsula. The meta-sedimentary formations from the ...
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핵심어 | 질문 | 논문에서 추출한 답변 |
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호남전단대의 특징은 무엇인가? | , 1985; Cluzel et al., 1991)로 불리는데, 호남전단대는 100 km 이상의 폭에 지역에 따라 시기가 다른 여러 전단대들로 구성이 되어있어 순창 전단대, 전주전단대, 광주전단대, 영광전단대 등으로 구분하여 명명이 되었다(Cheong, 1998). 이들 전단대 중 전주-순창-해남을 잇는 순창전단대(Kim and Kee, 1991; Kee and Kim, 1992; Lee, 1992; Kim and Kee, 1994)가 가장 규모가 크고 연장선이 긴 주 전단대로 동쪽의 영남육괴와 서쪽의 옥천대 사이의 주경계로 간주되고 있으며, 트라이아스기에 있었던 북중국과 남중국 지괴의 충돌과 연관된 것으로 해석하는 지구조 모델들이 제시되었다(Yin and Nie, 1993; Chough et al. | |
광주전단대가 옥천변성대와 영남육괴의 지구조적 경계일 가능성을 암시하는 내용은 무엇인가? | 이 연구에선 한반도 남서부에 북북동-남남서 주향으로 발달된 호남전단대의 지류 중의 하나인 광주 전단대 주변에 전단대를 따라 분포된 변성퇴적암층에 대해 고분해능이온마이크로프로브를 이용하여 쇄설성 저어콘의 우라늄-납 연대측정을 수행하였다. 광주전단대를 경계로 각각 서쪽과 동쪽에 위치한 영광지역과 장성지역의 변성퇴적암층들은 저어콘 연대분포가 구별되는 특징을 보인다. 영광지역 규암층의 저어콘들은 신시생대(약 2,500 Ma), 고원생대(약 1,860 Ma), 신원생대(약 960Ma) 및 고생대(약 380 Ma) 연령에 집중점을 이루는데 반해, 장성지역 규암층의 저어콘들은 신시생대(약 2,500 Ma)와 고원생대(약 1,880 Ma) 연령에 집중점을 이루고 보다 젊은 연대는 산출되지 않는다. 두 지역의 대조적인 연대분포 특성은 서쪽의 영광지역 변성퇴적암층은 옥천변성대 변성퇴적암층에, 동쪽의 장성지역 변성퇴적암층은 영남육괴의 퇴적암층에 각각 대비됨을 지시한다. 이러한 결과는 광주전단대가 옥천변성대와 영남육괴의 지구조적 경계일 가능성을 암시한다. | |
한반도는 무엇으로 구성되어 있는가? | 한반도는 지체구조적으로 주로 선캠브리아기 기반암으로 이루어진 낭림, 경기 및 영남의 3개의 육괴와 이들을 경계 짓는 임진강대와 옥천대 두 변동대로 구성되어 있다(Fig. 1). |
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