The Journal of the Petrological Society of Korea (암석학회지)

The Petrological Society of Korea (한국암석학회)
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Geochemical Implication of Rare Earth Element Tetrad Effect from a Leucocratic Granite Gneiss in the Imweon Area, Gangwon Province, Korea

강원도 임원지역 우백질 화강편마암에 나타난 희토류원소 테트라드 효과의 지구화학적 의의

  • Lee, Seung-Gu (Groundwater and Geothermal Resources Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Kun-Han (Geological and Environmental Hazard Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Song, Yong-Sun (Department of Environmental Geosciences, Pukyoung National University) ;
  • Kim, Nam-Hoon (Department of Environmental Geosciences, Pukyoung National University) ;
  • Park, Kye-Hun (Department of Environmental Geosciences, Pukyoung National University)
  • 이승구 (한국지질자원연구원 지하수지열연구부) ;
  • 김건한 (한국지질자원연구원 지질환경재해연구부) ;
  • 송용선 (부경대학교 환경지질과학과) ;
  • 김남훈 (부경대학교 환경지질과학과) ;
  • 박계헌 (부경대학교 환경지질과학과)
  • Published : 2007.03.30
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Abstract

Here we discuss a geochemical characterisitc of rare earth element (REE) pattern of a Precambrain leucogranitic gneiss at Imweon, Gangwon Province, Korea. The outcrop includes biotite gneiss xenolith. The leucocratic granite gneiss contacting with biotite gneiss is pegmatitic. However, there is no evidence of contact metamorphism between biotite gneiss and leucocratic-pegmatitic granite gneiss. The leucocratic granite gneiss shows a specific phenomenon of M-type (convex curved) tetrad effect in chondrite-normalized REE patterns with large negative Eu anomaly. The degree of REE tetrad effect in the leucocratic-pegmatitic granitec gneiss is weak and shows partly W-type (concave curved) tetrad effect. The Eu anomaly of leucocratic granite gneiss has close relationship with the degree of tetrad effect as well as Ca/Sr ratio. Our results suggest that the REE tetrad effect from the leucocratic granite gneiss should be formed during differentiation process of granitic magma. We also confirmed that the weathering might affect Eu or Ce anomaly rather than the formation of REE tetrad effect in granitic rock.

강원도 임원진 부근에 분포하는 선캠브리아기 우백질 화강편마암체 노두에서의 희토류원소 분포도가 갖는 지구화학적 의의에 대해 토의하고자 한다. 이 노두는 흑운모 편마암을 포획암으로 갖고 있으며, 이 흑운모 편마암과 접촉하고 있는 우백질 화강편마암은 주변에 비해 구성광물의 입자가 큰 거정질이고, 접촉변성 작용의 흔적은 관찰되지 않는다. 이 노두에서의 우백질 화강 편마암은 풍화도와 관계없이 전반적으로 Eu의 강한 부(-)의 이상과 더불어 희토류원소의 M-형의 테트라드 효과라 불리우는 특이한 희토류원소 분포도 특성을 갖고 있다. 그리고 흑운모 편마암과의 접촉부에서는 M-형의 테트라드 효과가 약화되었거나 혹은 부분적으로 W-형의 테트라드 효과가 관찰된다. 우백질 화강편마암에서의 Eu의 부의 이상은 Ca/Sr비의 변화뿐만 아니라 테트라드 효과의 존재와도 밀접한 연관성을 보여준다. 이는 임원지역의 노두에서 관찰된 희토류원소의 테트라드 효과가 우백질 화강편마암의 분화과정상에서 형성된 것이며, 암석의 풍화가 Eu의 이상 혹은 Ce의 이상의 변화를 가져올 수는 있지만 희토류원소의 테트라드 효과를 만들거나 크기를 변화시킨 요인은 아님을 지시해준다.

Keywords

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