The Journal of the Petrological Society of Korea (암석학회지)

The Petrological Society of Korea (한국암석학회)
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Petrology of the Mt. Dungjuribong Volcanic Complex, Gurye-gun, Southwest of Ryeongnam Massif

영남육괴 남서부 구례군 둥주리봉 화산암복합체에 대한 암석학적 연구

  • Koh, Jeong-Seon (Research Institute of Science Education, Pusan National University) ;
  • Yun, Sung-Hyo (Department of Earth Science, Pusan National University) ;
  • Kim, Young-La (Jangyoungsil Science High School)
  • 고정선 (부산대학교 과학교육연구소) ;
  • 윤성효 (부산대학교 지구과학교육과) ;
  • 김영라 (장영실과학고등학교)
  • Published : 2009.12.31
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Abstract

The Mt. Dungjuribong Volcanic Complex located in Gurye-gun, southwest of Ryeongnam massif, composed of Cretaceous andesitic rocks and rhyolite. $SiO_2$ contents of the volcanic rocks range from 52.0 to 78.5 wt.%. The major and trace elements composition, REE patterns and tectonomagmatic discrimination diagrams of volcanic rocks suggest that they are typical of continental margin arc calc-alkaline rocks produced in the subduction environment. The phenocrysts of the volcanic rocks show that they had gone in disequilibrium state, such as reversal zoning and resorbed core of plagioclase, reaction rim around pyroxene and resorbed margins of quartz, which showing the evidence of magma mixing during the evolution of magma.

영남육괴의 남서부에 위치한 구례군 둥주리봉 화산암복합체는 백악기의 안산암과 유문암으로 구성된다. 화산암류의 $SiO_2$ 함량은, 52.0~78.5 wt.%의 넓은 조성범위를 나타내며, 칼크-알칼리 계열의 분화경향을 나타낸다. 주원소, 미량원소와 희토류원소의 패턴 및 조구조 판별도에 의하면, 연구지역의 화산암류가 지판이 침강 섭입하는 지판경계부에서 생성된 마그마로부터 유래된 대륙연변호 칼크-알칼리암 계열 화산암임을 지시한다. 화산암내 반정광물의 비평형 특징 즉, 휘석 결정 주변의 반응연의 존재, 사장석 결정의 역누대구조와 중심부의 융식구조, 석영 반정의 가장자리의 융식된 구조 등 마그마가 진화하는 동안 경험한 마그마혼합에서 나타나는 증거들이 비교적 잘 관찰된다.

Keywords

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