Geosciences Journal

The Association of Korean Geoscience Societies (한국지질과학협의회)
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An early Proterozoic Sm-Nd age of mafic granulite from the Hwacheon area, South Korea

Lee, Seung-Ryeol;Cho, Moon-Sup;Cheong, Chang-Sik;Park, Kye-Hun

  • Published : 1997.09.01

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Abstract

The Sm-Nd mineral isochron ages of $1897\pm120\;and\;1742 \pm140$ Ma were obtained from two mafic granulites of the Hwacheon granulite complex, east-central Korean Peninsula. These ages are interpreted to date the granulitefacies metamorphism and/or subsequent cooling to ca. $700^{\circ}C$. Our result apparently contradicts the Permo-Triassic age for the regional metamorphism that was reported in the Imjingang belt, and instead suggests an early Proterozoic tectonometamorphic event that may be related to the crustal formation of the Gyeonggi massif. Thus, the Hwacheon granulite complex is likely to represent Proterozoic crystalline basement that was reactivated during the Permo-Triassic orogeny, corresponding to the collision between the Sino-Korean and Yangtze cratons.

Keywords

References

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