Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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Geochemical Characteristics of Mineral Phases in the Mantle Xenoliths from Sunheul-ri, Jeju Island

제주도 선흘리 일대에 분포하는 맨틀포획암 내의 광물의 지화학적 특성 연구

  • Kil, Young-Woo (Geological Museum, Korea Institute of Geoscience and Mineral Resources) ;
  • Shin, Hong-Ja (Geological Museum, Korea Institute of Geoscience and Mineral Resources) ;
  • Yun, Sung-Hyo (Department of Earth Sciences, Pusan National University) ;
  • Koh, Jeong-Seon (Department of Earth Sciences, Pusan National University) ;
  • Ahn, Ung-San (Department of Earth and Environmental Sciences, Andong National University)
  • 길영우 (한국지질자원연구윈 지질박물관) ;
  • 신홍자 (한국지질자원연구윈 지질박물관) ;
  • 윤성효 (부산대학교 지구과학과) ;
  • 고정선 (부산대학교 지구과학과) ;
  • 안웅산 (안동대학교 지구환경과학과)
  • Published : 2008.12.30
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Abstract

First reported geochemical characteristics of mantle xneoliths (spinel peridotites) from Sunheul-ri, Jeju Island, provide important clues for understanding the lithosphere composition, equilibrium temperature, and the period of entrainment and transport of the xenoliths in the host magma. Core and rim of mineral phases in the xenoliths are constant chemical compositions as $Fo_{89-90}$ of olivines. The ranges of equilibrium temperature, obtained by two pyroxenes geothermometer, are about $951{\sim}1035^{\circ}C$ for Sunheul-ri spinel peridotite xenoliths and are similar to the range of equilibrium temperatures for the xenoliths from other sites in Jeju island. The period of entrainment and transport of the xenoliths in the host magma of Sunheul-ri mantle xenoliths is about 42 days.

제주도 동북사면에서 발견된 선흘리 스피넬 페리도타이트 맨틀포획 암의 지화학적 특성은 처음보고 되는 것으로 제 4기 제주도 동북사면 하부에 위치한 상부맨틀의 화학 조성, 평형 온도, 마그마 정체 시간에 관한 일련의 정보를 제공하여 준다. 감람석($Fo_{89-90}$)을 포함한 스피넬 페리도타이트 내 구성광물들의 화학 조성은 일정하며 광물 중심부와 연변부의 화학 조성 차이 또한 크지 않다. 사방휘석-단사휘석 지온계를 이용하여 얻은 평형 온도 범위(약 $951{\sim}1035^{\circ}C$)는 기존 제주도 다른 지역에서 산출되는 맨틀포획암에서 얻어진 온도 범위와 유사하다. 스피넬 페리도타이트가 모마그마에 포획되어 정체된 시간은 확산방정식과 감람석 내 칼슘 농도 변화를 이용하여 계산하여 본 결과 약 42일이다.

Keywords

References

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