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2009 Vol.46, Issue 5 Preview Page
Hydrothermal Alteration of Limestone in the Okcheon Belt by Stable Isotopes and Trace Elements

옥천대에 분포하는 석회암의 안정동위원소와 미량원소에 의한 열수변질에 관한 연구

윤정한

Chung-Han Yoon

31 October 2009. pp. 589-601
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Abstract
Oxygen and carbon isotope compositions, and trace elements such as Mn, Fe, Zn, Sr and Na were analyzed for the limestones distributed in Okcheon belt by mass-spectrometer and ICP-MS. The limestones are divided into two groups; one is a white and recrytallized (WLs), and another is dark and grayish (DLs). There is a slight tendency to be lower δ18O values in WLs which was hydrothermally altered. The δ18O value of 18‰ in the Gwangwon area distinguishes WLs from DLs. 13C-average values of each WLs are a slightly larger range than those of DLs. However, 13C-average values of WLs and DLs in each area show to be very narrow range. The proofs of hydrothermal alteration in WLs are considered as following; 1) the δ18O values of WLs are low at the places where limestones are recrystalized, and/or near contact parts between WLs and granitoids, and 2) Mn and Fe contents are enrich in the above samples. δ18O-13C and δ18O-Mn are slightly positive correlations, however, there are no characteristic relationships among other elements.
Keywords
Oxygen and carbon isotope compositions
Trace elements
Mass-spectrometer
ICP-MS
WLs
DLs
Hydrothermal alteration
옥천대에 분포하는 석회암을 대상으로 질량분석기와 ICP-MS를 이용하여 탄소 및 산소 안정동위원소와 Mn, Fe, Zn, Sr, Na 등과 같은 미량원소를 분석하였다. 연구대상 석회암을 색과 재결정 여부에 따라 백색석회암(WLs)과 흑색석회암(DLs)으로 분류하였다. 일반적으로 열수변질을 받은 백색석회암의 δ18O값이 흑색석회암의 값보다 약간 낮은 경향을 보인다. 강원도 지역에서 백색석회암은 18‰이하에 그리고 흑색석회암은 18‰이상에 도시되는 것으로 보아 18‰이하의 백색석회암은 변질을 받은 것으로 판단된다. 백색석회암의 평균13C값은 흑색석회암의 평균13C값 보다 약간 더 넓은 범위를 나타내나, 각 지역의 백색석회암과 흑색석회암의 13C값은 매우 좁은 범위의 값을 나타낸다. 백색석회암이 열수변질을 받은 것으로 추정할 수 있는 증거로는 1) 쥬라기 화강암과 접촉부 또는 열수 충진한 연-아연 세맥이 발달된 부분에서 백색석회암의 δ18O값이 낮고 균질한 점, 그리고 2) 이상의 시료에서 Mn과 Fe함량이 더 부화된다는 점 등이다. δ18O-13C과 δ18O-Mn은 대체로 약한 정의 상관관계를 보여주나 다른 요소 사이에서는 특징적인 관계를 보이지 않는다.
키워드
탄소 및 산소 안정동위원소
미량원소
질량분석기
ICP-MS
백색석회암
흑색석회암
열수변질
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Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society for Geosystem Engineering
  • Journal Title(Ko) :한국지구시스템공학회지
  • Volume : 46
  • No :5
  • Pages :589-601
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