The Journal of the Petrological Society of Korea (암석학회지)

The Petrological Society of Korea (한국암석학회)
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Magma Pathway of Alkali Volcanic Rocks in Goseong, Gangwon-do, Korea

강원도 고성지역에 분포하는 알칼리 현무암질 마그마의 상승경로

  • Kil, Young-Woo (Geological Museum, Korea Institute of Geoscience and Mineral Resources) ;
  • Shin, Hong-Ja (Geological Museum, Korea Institute of Geoscience and Mineral Resources) ;
  • Ko, Bo-Kyun (School of Earth and Environmental Sciences, Seoul National University)
  • 길영우 (한국지질자원연구원 지질박물관) ;
  • 신홍자 (한국지질자원연구원 지질박물관) ;
  • 고보균 (서울대학교 지구환경과학부)
  • Published : 2007.12.31
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Abstract

Miocene basalt plugs in Goseong contain a large variety of crustal and mantle xenoliths and xenocrysts. One of basalt plugs, Unbongsan, are derived from 160 km depth. Whole-rock geochemistry and pressure and temperature conditions of mineral phases indicate that Unbongsan volcanic rocks are alkali basalts and the source magma of the alkali basalts was generated from about $0.2{\sim}2%$ partial melting of depleted garnet peridotite. Crystallization pressures and temperatures of mineral phases within ascending magma of Unbongsan alkali basalt indicate that olivines, clinopyroxenes, and plagioclases were crystallized at $75{\sim}110km,\;40{\sim}52km,\;37{\sim}54km$ depth, respectively. The ascending magma of Unbongsan alkali basalts enclosed mantle xenoliths at about $57{\sim}67km$ depth.

강원도 고성지역에는 여러 종류의 포획암과 포획결정을 내포한 마이오세 현무암들이 화산전(volcanic plug) 형태를 이루며 분포한다. 이들 화산전중에서 운봉산화산전의 근원마그마는 지하 160km 깊이에서 형성되어 지표로 올라왔다. 전암화학분석, 구성광물의 평형온도 및 압력은 운봉산화산전을 형성한 화산암이 알칼리현무암이며, 결핍된 석류석 페리도타이트의 $0.2{\sim}2%$의 부분용융에 의하여 형성되었음을 지시한다. 이 마그마는 감람석, 단사휘석, 사장석을 각각 $75{\sim}110km,\;40{\sim}52km,\;37{\sim}54km$ 깊이에서 정출하였으며, 맨틀포획암인 스피넬 페리도타이트를 지하 $57{\sim}67km$에서 포획하여 지표에 빠른 속도로 올라왔다.

Keywords

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