Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Geochemical Study on the Naturally Originating Fluorine Distributed in the Area of Yongyudo and Sammokdo, Incheon

인천 용유도와 삼목도 지역 내 분포하는 자연기원 불소에 대한 지구화학적 연구

  • Lee, Jong-Hwan (Department of Geology and Research Institute of Natural Science (RINS), Gyeongsang National University (GNU)) ;
  • Jeong, Jong-Ok (Centralized Scientific Instrumentation Facility (CSIF), Gyeongsang National University(GNU)) ;
  • Kim, Kun-Ki (Geochang Granite Research Center) ;
  • Lee, Sang-Woo (Department of Geology and Research Institute of Natural Science (RINS), Gyeongsang National University (GNU)) ;
  • Kim, Soon-Oh (Department of Geology and Research Institute of Natural Science (RINS), Gyeongsang National University (GNU))
  • 이종환 (경상대학교 자연과학대학 지질과학과 및 기초과학연구소) ;
  • 정종옥 (경상대학교 공동실험실습관) ;
  • 김건기 ((재)거창화강석연구센터) ;
  • 이상우 (경상대학교 자연과학대학 지질과학과 및 기초과학연구소) ;
  • 김순오 (경상대학교 자연과학대학 지질과학과 및 기초과학연구소)
  • Received : 2019.07.29
  • Accepted : 2019.08.28
  • Published : 2019.08.28
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Abstract

Geochemical study was conducted to elucidate the origin of fluorine (F) distributed in the rocks within the four areas of Yongyudo and Sammokdo, Incheon, which have been used as the source area of land reclamation for the $3^{rd}$ and $4^{th}$ stage construction sites of the Incheon International Airport. The main geology of the study area is Triassic biotite granite. Fluorine is contained at high levels in biotite granite, mylonite, and dykes (andesite and, basaltic-andesite). Furthermore, the higher concentrations of fluorine in the biotite granite can be contributed to fluorite. The results of microscopic analyses reveal that the fluorite was mostly observed as small vienlets together with quartz. This features support that fluorite was naturally formed due to the secondary process of hydrothermal fluids. In addition, fluorine was investigated to be highly enriched in a large amount of mica within the veins. In the case of mylonite, a high levels of fluorine was contributed to a large amount of sericite. The sericites contained in the mylointe, differently to those of the biotite granite, filled the micro-fractures of quartz formed as a result of mylonitization and included small cataclastic quartz grains. This indicates that fluorine was naturally enriched due to the alteration of hydrothermal fluids filling fractured zones formed by mylonitization. Consequently, the results of petrological and mineralogical study confirm that the fluorine distributed in the rocks within the Yongyudo and Sammokdo originated naturally.

본 연구는 인천국제공항 3, 4단계 건설 사업부지 토취원으로 활용된 용유도와 삼목도 내 4개 지역의 암석 내에 분포하는 불소의 기원을 규명하고자 지구화학적 분석을 수행하였다. 용유도 및 삼목도 등지는 트라이아스기 흑운모화강암이 분포하는 지역으로 불소는 주로 흑운모화강암과 암맥류(안산암, 현무암질 안산암), 압쇄암에서 고농도로 존재한다. 흑운모화강암은 형석에 의해 불소함량이 높게 나타나며, 현미경 관찰 결과 형석은 주로 석영과 동반하여 세맥의 형태로 나타난다. 이러한 특징은 형석이 이차적인 열수에 의하여 자연적으로 형성된 것으로 해석된다. 암맥류의 높은 불소함량은 다량의 운모류에 의한 자연적 기원의 형성으로 판단된다. 압쇄암은 다량의 견운모에 의해 불소함량이 높게 나타난다. 압쇄암 내 견운모는 흑운모화강암에서 나타나는 견운모와 달리 압쇄작용에 의해 깨진 석영의 균열을 채우고 있으며 압쇄된 미결정의 석영을 포획하고 있다. 이러한 특징은 압쇄작용에 의해 생긴 연약대를 따라 들어온 열수에 의하여 자연적으로 불소가 부화되었다는 것을 지시한다. 따라서 용유도 및 삼목도 등지의 암석 내 존재하는 불소는 자연발생적 기원인 것으로 판단된다.

Keywords

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