The Journal of the Petrological Society of Korea (암석학회지)

The Petrological Society of Korea (한국암석학회)
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SHRIMP U-Pb Zircon Dating and Volcanic Process of the Volcanic Rocks around the Jayang Caldera, Northern Yeongcheon, Korea

영천 북부 자양 칼데라 주변의 화산암류에 대한 SHRIMP U-Pb 저어콘 연대측정과 화산과정

  • Hwang, Sang Koo (Department of Earth and Environmental Sciences, Andong National University) ;
  • Jo, In Hwa (Korea Basic Science Institute) ;
  • Son, Yong Seok (Department of Earth and Environmental Sciences, Andong National University) ;
  • Song, Kyo-Young (Korea Institute of Korea Institute of Geoscience and Mineral Resources) ;
  • Yi, Keewook (Korea Basic Science Institute)
  • 황상구 (안동대학교 지구환경과학과) ;
  • 조인화 (한국기초과학지원연구원 환경과학연구부) ;
  • 손용석 (안동대학교 지구환경과학과) ;
  • 송교영 (한국지질자원연구원 국토지질연구부) ;
  • 이기욱 (한국기초과학지원연구원 환경과학연구부)
  • Received : 2019.11.12
  • Accepted : 2019.12.11
  • Published : 2019.12.31
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Abstract

The volcanic rocks around the Jayang caldera are classified in an order such as Jukjang Volcanics, Doil Rhyolite, Unjusan Tuff and Rhyolite intrusions. By the SHRIMP U-Pb zircon datings from zircons, eruption ages of the Unjusan Tuff are constrained as 66.65±0.96 Ma in the intracaldera, and 66.08±0.62 Ma in the extracaldera outflow, and intrusion age of the ring dike is investigated as 60.74±0.66 Ma. The age data indicate that the caldera was collapsed between 66.08 Ma and 60.74 Ma, just before the dike intruded after the explosive eruption of the Unjusan Tuff. The Jayang caldera shows the composite igneous process of a perfect volcanic cycle passing from ash-flow tuffs through caldera collapse into ring dikes in the Jayang area.

자양 칼데라 주변의 화산암류는 죽장화산암층, 도일유문암, 운주산응회암, 유문암관입체 순으로 분류된다. 저어콘의 SHRIMP U-Pb 연대측정 결과에 의하면 운주산응회암은 칼데라 내부에서 66.65±0.96 Ma, 칼데라 외부에서 66.08±0.62 Ma의 분출연대를 나타내고, 환상암맥은 60.74±0.66 Ma의 관입연대를 나타낸다. 연대측정 결과에 의하면 자양 칼데라는 운주산응회암의 폭발성 분출과 환상암맥 관입 사이인 66.08~60.74 Ma 사이에 함몰되었음을 지시해준다. 자양 칼데라는 이 지역에서 회류응회암-칼데라함몰-환상암맥으로 연결되는 완벽한 화산윤회를 거치는 복잡한 화산과정을 나타낸다.

Keywords

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