암석학회지 (The Journal of the Petrological Society of Korea)

한국암석학회 (The Petrological Society of Korea)
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제주도 산굼부리의 성인

Origin of Sangumburi, Jeju Island

  • 길영우 (전남대학교 에너지자원공학과) ;
  • 윤성효 (부산대학교 지구과학교육과) ;
  • 이문원 (강원대학교 과학교육학부) ;
  • 양경희 (부산대학교 지질환경과학과) ;
  • 설정환 (전남대학교 에너지자원공학과)
  • Kil, Youngwoo (Department of Energy and Resources Engineering, Chonnam National University) ;
  • Yun, Sung-Hyo (Department of Earth Science Education, Pusan National University) ;
  • Lee, Moon Won (Department of Science Education, Kangwon National University) ;
  • Yang, Kyounghee (Department of Geological Sciences, Pusan National University) ;
  • Seol, Junghwan (Department of Energy and Resources Engineering, Chonnam National University)
  • 투고 : 2016.08.08
  • 심사 : 2016.08.24
  • 발행 : 2016.09.30
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초록

천연기념물 제63호로 지정된 산굼부리 분화구은 기존 마르형 분화구로 인식되었지만, 새로운 정밀지질도 작성과 함께 야외에서의 지질학적 특징들이 산굼부리 분화구가 두 번에 걸친 화산활동으로 형성된 함몰분화구(pit crater)임을 지시한다. Stage 1 단계에서는 비현정질휘석현무암 I와 화산재와 래필리로 구성된 화성쇄설물 I가 동시에 형성되었고, stage 2 단계에서는 침상장석감람석현무암 형성 후 비현정질휘석현무암 II와 집괴암으로 구성된 화성쇄설물 II가 동시에 형성되었다. Stage 2의 침상장석감람석현무암을 Ar-Ar 연대측정 결과 산굼부리 함몰분화구는 7만3천 년 전에 형성되었다. 산굼부리 분화구는 함몰분화구(pit crater)임에도 불구하고 현재까지는 하부로 빠져나간 마그마의 방향을 알 수 없다.

Sangumburi crater, designated as Natural Monument No. 63, recognized as a maar, but precise geological mapping and geological characteristics in the field indicate that Sangumburi crater is a pit crater. Two stages of volcanic activities created Sangumburi pit crater. Lava flow (aphanitic pyroxene basalt I) and associated pyroclastic deposit (pyroclast I), composed of ash and lapilli, were formed at the stage 1. In the stage 2, lava flow (feldspar olivine basalt) was overlain by lava flow (aphanitic pyroxene basalt II) and associated pyroclastic deposit (pyroclast II), composed of agglomerate. Sangumburi pit crater formed at $0.073{\pm}0.036Ma$, determined by Ar-Ar age dating for the feldspar olivine basalt at the stage 2. It is not clear the preferred migration direction of subsurface magma after Sangumburi pit crater formed.

키워드

참고문헌

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피인용 문헌

  1. Editorial : Neotectonic and Magma Evolution in the Korean Peninsula and Its Vicinity vol.25, pp.3, 2016, https://doi.org/10.7854/JPSK.2016.25.3.165