Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Sr-Nd-Pb Isotopic Study of the Ogcheon Amphibolites

옥천 각섬암의 Sr-Nd-Pb 동위원소 연구

  • Received : 1996.01.10
  • Published : 1996.02.28
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Abstract

Sr-Nd-Pb isotopic results are reported for the Ogcheon amphibolites from the central part of the Ogcheon Belt. Rb-Sr and Pb-Pb whole rock isotope data plot greatly scattered in the isochron diagrams due to later alteration or metamorphism, whereas the Sm-Nd whole rock isotope data define a linear array with an age of $1270{\pm}220$ Ma ($1{\sigma}$). Considering several geochemical features of the amphibolites, the 1270 Ma linear array may be not a true but an apparent mixing isochron due to source heterogeneity.

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