Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Clay Mineralogical Study on Genetic Environment of the Solnhofen Limestone

졸른호펜 석회암의 퇴적성인에 대한 점토광물학적 연구

  • 문지원 (연세대학교 지구시스템과학과) ;
  • 박명호 (독일 뷔르쯔부르크대학 지질고생물학연구소) ;
  • 송윤구 (연세대학교 지구시스템과학과) ;
  • 문희수 (연세대학교 지구시스템과학과)
  • Published : 2001.06.01
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Abstract

Variation in relative contents of clay minerals was used to genetically interpret depositional environment of the Upper Jurassic Solnhofen limestone. Mineralogical examination of whole rocks and clay fractions indicates that the faule and flinz beds are composed mainly of calcite and quartz with minor amount of clay minerals such as illite, kaolinite, and smectite. Smectite shows a trend of illitization: illite layers increase with increasing of burial depth. With increasing burial depth, relative abundance of kaolinite with quartz and illite increases. This implies that the Solnhofen basin was formed during the transgression based on reduce of terrigenous influx.

상부쥐라기 졸른호펜 석회암의 생성환경을 해석하기 위하여 점토광물의 상대함량 변화를 고찰하였다. 전암시료 및 점토입도시료에 대한 광물학적 연구결과에 따르면 포일레층과 플린츠층은 공히 방해석과 석영을 주구성광물로, 소량의 일라이트, 카올리나이트와 스멕타이트를 함유하고 있다. 스멕타이트는 속성작용을 통해 심도에 따라 일라이트화 작용을 심하게 받았으며, 카올리나이트는 심도의 증가에 따라 상대함량이 증가하는 경향을 보인다. 이러한 결과는 다음과 같은 가능성을 제시한다. 즉, 육상기원을 지시하는 카올리나이트 및 석영과 일라이트 등의 쇄설입자의 유입이 상위구간으로 갈수록 감소하고 탄산염광물의 함량이 증가함은 해침을 통해 육성퇴적물의 유입이 감소했음을 의미한다.

Keywords

References

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