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SHRIMP V-Pb Zircon Age of a Felsic Meta-tuff in the Ogcheon Metamorphic Belt, Korea: Neoproterozoic (ca. 750 Ma) Volcanism  

조문섭 (서울대학교 자연과학대학 지구환경과학부)
김태훈 (동경대학교 지진연구소)
김현철 (서울대학교 자연과학대학 지구환경과학부)
Publication Information
The Journal of the Petrological Society of Korea / v.13, no.3, 2004 , pp. 119-125 More about this Journal
Abstract
Using a SHRIMP ion microprobe, we have dated zircon grains of a felsic meta-tuff from the so-cal1ed Munjuri Formation, Ogcheon metamorphic belt. The weighted mean $^{206}$ Pb/$^{238}$ U zircon ages obtained from 13 spot analyses of 10 grains provide an essentially concordant age of 747${\pm}$7Ma. This result corroborates the conventional U-Pb zircon age (756${\pm}$1Ma; Lee et al., 1998) for the Neoproterozoic bimodal volcanism in the Ogcheon belt. Thus, proto-basins associated with intracontinental, high-volcanicity rift in the Ogcheon belt are most likely to have formed at ca. 750 Ma.
Keywords
Munjuri Formation; SHRIMP ion microprobe; zircon; Neoproterozoic; SHRIMP; Ogcheon belt;
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