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Sr, Nd and Pb Isotopic Compositions of the Pyeongtaek-Asan Alkali Basalts: Implication to the Contrasting Compositional Boundary for the Mantle beneath Korean Peninsula  

Park, Kye-Hun (Department of Environmental Geosciences, Pukyong National University)
Cheong, Chang-Sik (Division of Earth and Environmental Science, Korea Basic Science Institute)
Jeong, Youn-Joong (Division of Earth and Environmental Science, Korea Basic Science Institute)
Publication Information
The Journal of the Petrological Society of Korea / v.17, no.3, 2008 , pp. 144-153 More about this Journal
Abstract
Sr, Nd, Pb isotopic compositions of the Cenozoic basaltic rocks distributed in Pyeongtaek-Asan area display significantly enriched values compared with mid-ocean ridge basalts just like other Cenozoic basalts of Korea. The isotopic compositions of most of the Cenozoic basaltic rocks of Korea including those from Pyeongtaek-Asan area can be explained as mixing between enriched mantle component with relatively low $^{206}Pb/^{204}Pb$ ratios and depleted mantle component. In contrast, Jejudo basalts can be explained as mixing between enriched mantle component with realtively higher $^{206}Pb/^{204}Pb$ ratios and depleted mantle componsnt. Combined with that very similar division of enriched mantle components is applied to the Cenozoic basalts of northeast China and southeast China, it is suggested that subcontinental lithospheric mantle of central and southern parts of Korea represents eastern extension of North China Block and South China Block respectively. The indentation model for the late Paleozoic to early Mesozoic continental collision of China contradicts to such an interpretation, because it cannot explain occurrence of subcontinental lithospheric mantle component of South China Block-affinity under the Jejudo area. Instead, it is more probable that suture zone of the two continental blocks crosses between central and southern Korea and its location is further south from the Pyeongtaek-Asan area. Such distinct location compared with Imjingal belt, supposedly collisional boundary suggested before, suggests that mantle boundary may not be coincide with crustal boundary for the continental collision.
Keywords
alkali basalt; mantle xenolith; radiogenic isotope; mantle domain; East Asia;
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