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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 Pb/U age pooled from 6 spot analyses of two specimens is 170±2 Ma (2σ, 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.

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