암석학회지 (The Journal of the Petrological Society of Korea)

한국암석학회 (The Petrological Society of Korea)
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흑산도 화강암의 저어콘 U-Pb 연령: 약 114 Ma 화성활동의 의미

Zircon U-Pb age of the Heuksan-do Granite: Implication of the Magmatism at ca. 114 Ma

  • 이태호 (부경대학교 일반대학원 지구환경시스템과학부) ;
  • 박계헌 (부경대학교 일반대학원 지구환경시스템과학부) ;
  • 송용선 (부경대학교 일반대학원 지구환경시스템과학부) ;
  • 김명정 (부경대학교 일반대학원 지구환경시스템과학부)
  • Lee, Tae-Ho (Division of Earth and Environmental Sciences, Pukyong National University) ;
  • Park, Kye-Hun (Division of Earth and Environmental Sciences, Pukyong National University) ;
  • Song, Yong-Sun (Division of Earth and Environmental Sciences, Pukyong National University) ;
  • Kim, Myoung Jung (Division of Earth and Environmental Sciences, Pukyong National University)
  • 투고 : 2017.01.24
  • 심사 : 2017.03.08
  • 발행 : 2017.03.31
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초록

한반도 남서부 목포시에서 서쪽으로 약 90 km 지점에 위치한 흑산도의 소규모 화강암질 관입체로부터 분리한 저어콘에 대한 SHRIMP U-Pb 연대측정 결과 $113.9{\pm}1.2$(n=16) Ma의 정치연령을 얻었다. 백악기 앱티안-알비안 경계시기에는 한반도 거의 전역에서 화성활동이 나타났을 뿐만 아니라 중국 동부와 일본에서도 동일한 시기의 화성활동이 나타난 것으로 보고되었다. 평평한 각도로 일어난 섭입작용에 이은 엽렬에 의해 이처럼 일시적이지만 동아시아의 매우 넓은 지역에서 동시적인 화성활동을 만들어내었을 가능성이 있다.

We report an Early Cretaceous zircon U-Pb age ($113.9{\pm}1.2Ma$) for the Heuksan-do granite located about 90km from Mokpo offcoast of the southwestern Korean peninsula. At this Aptian/Albian boundary, widespread igneous activities occurred not only in the Korean peninsula but also in the eastern China and Japan. We raise the possibility that the flat-slab subduction and delamination triggered such an episodic igneous activity over the large areas of East Asia.

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참고문헌

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