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http://dx.doi.org/10.7854/JPSK.2016.25.1.29

Jurassic (~170Ma) Zircon U-Pb Age of a "Granite Boulder" in the Geumgang Limestone, Ogcheon Metamorphic Belt, Korea: Reinterpretation of its Origin  

Cheong, Wonseok (Department of Earth and Environmental Sciences, Chungbuk National University)
Cho, Moonsup (Department of Earth Science Education, Seoul National University)
Yi, Keewook (Division of Environmental and Material Sciences, Korea Basic Science Institute)
Lee, Min Sung (Department of Earth Science Education, Seoul National University)
Kim, Yoonsup (Department of Earth and Environmental Sciences, Chungbuk National University)
Publication Information
The Journal of the Petrological Society of Korea / v.25, no.1, 2016 , pp. 29-37 More about this Journal
Abstract
A "granite boulder", ~70 cm in size, was reported from the Geumgang Limestone, and has been considered as a glaciogenic dropstone. Since this interpretation has enormous implications for unraveling the evolution history of the Ogcheon Metamorphic Belt, we re-examined the contact relationship and structure of the "granite boulder", and estimated its emplacement age based upon SHRIMP U-Pb zircon dating. The weighted mean $^{206}Pb/^{238}U$ age pooled from 6 spot analyses of two specimens is $170{\pm}2Ma$ ($2{\sigma}$, MSWD=2.2). This zircon age suggests that the "granite boulder" in the Geumgang Limestone is a part of Jurassic granite, rather than a glaciogenic dropstone.
Keywords
Geumgang Limestone; granite boulder; dropstone; SHRIMP U-Pb zircon dating; Jurassic granite;
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