Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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SHRIMP U-Pb Age of the Early Jurassic Deformed Granites in the Aneui Quadrangle, SW Yeongnam Massif

영남육괴 남서부 안의도폭 지역 초기 쥬라기 변형 화강암류의 SHRIMP U-Pb 연대

  • Seo, Jaehyeon (Department of Earth Environmental Sciences, Pukyong National University) ;
  • Song, Yong-Sun (Department of Earth Environmental Sciences, Pukyong National University) ;
  • Park, Kye-Hun (Department of Earth Environmental Sciences, Pukyong National University)
  • 서재현 (부경대학교 환경.해양대학 지구환경과학과) ;
  • 송용선 (부경대학교 환경.해양대학 지구환경과학과) ;
  • 박계헌 (부경대학교 환경.해양대학 지구환경과학과)
  • Received : 2016.03.18
  • Accepted : 2016.04.08
  • Published : 2016.04.28
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Abstract

SHRIMP U-Pb age determination was carried out for deformed granites in the Aneui quadrangle, SW Yeongnam Massif. Dating of zircons from a highly deformed mylonitic granite with banded structure and a relatively less deformed porphyritic to augenic granites, that were known as Precambrian gneisses, yielded the same age of ca. 195 Ma. On the basis of this result and previous age data, Early to Middle Mesozoic igneous activity around the Aneui area was interpreted as follows; Subduction-related granitic magmatism started with the intrusion of the Hamyang Granite in the middle Triassic (ca. 225-219 Ma) mainly in the west of the area and ended with syenitic intrusion at the end of Triassic period (ca, 220-210 Ma). After a relatively short period of quiescency, granitic magmatism restarted with the intrusion of magma forming deformed granites dated in this study at the Early Jurassic of ca. 195 Ma and continued to ca. 189 Ma and dioritic intrusion was associated around the late stage of granitic magmatism.

남서부 영남육괴 안의도폭 지역의 변형 화강암류에 대한 SHRIMP U-Pb 연대측정을 수행하였다. 선캠브리아 편마암으로 알려진, 현저하게 변형된 호상구조를 보이는 압쇄조직의 화강암과 비교적 약하게 변형된 반상 내지 안구상의 화강암 각각 한 개씩의 시료에서 분리된 저어콘에 대한 연대측정 결과는 약 195 Ma로 연대가 동일하였다. 이 연구 결과와 기존의 연대자료에 의해 안의도폭 주변부 지역에서의 중생대 초-중기 화성활동은 다음과 같이 해석되었다: 트라이아스 중기(약 225-219 Ma)에 섭입관련 화강암질 마그마작용이 주로 서부지역에서 함양 화강암의 관입으로 시작되었고 트라이아스 말기(약 220-210 Ma)에 섬장암질 관입으로 끝났다. 비교적 짧은 휴지기 후에, 쥬라기 초기인 약 195 Ma에 이번 연구에서 연대가 측정된 변형 화강암류를 생성한 마그마의 관입으로 화강암질 마그마작용이 다시 시작되어 약 189 Ma까지 계속되었으며, 화강암질 마그마작용의 말기에는 섬록암류의 관입이 수반되었다.

Keywords

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