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http://dx.doi.org/10.9719/EEG.2015.48.4.287

SHRIMP U-Pb Zircon Ages of the Metapsammite in the Yeongam-Gangjin Area  

Kim, Dong-Yeon (Geological Research Division, Korea Institute of Geoscience and Mineral Resources)
Choi, Sung-Ja (Geological Research Division, Korea Institute of Geoscience and Mineral Resources)
Yi, Keewook (Korea Basic Science Institute)
Publication Information
Economic and Environmental Geology / v.48, no.4, 2015 , pp. 287-299 More about this Journal
Abstract
The metapsammite distributed in the Yeongam-Gangjin area had been classified into age-unknown Yongamsan Formation, Seologri Formation and age-unknown Seogisan Formation, and these formations are reported as each other different formations. These formations have been renamed Precambrian Galdu or Permian Songjong Formations. In this study, we present detrital zircon SHRIMP U-Pb age data from the metapsammite to examine deposition time and stratigraphy. The analyzed U-Pb zircon ages dominantly reveal Paleoproterozoic ages of ca. 1.87Ga and the youngest detrital grains are constrained by the age of 246-265 Ma. The youngest age indicates late Permian or early Triassic for the deposition time. Therefore, the metapsammite in the Yeongam-Gangjin area is considered to be the upper formation of the late Paleozoic Pyeongan Group which is correlated with the Gohan-Donggo Formations or Nokam Formation of the Samcheock coal field and the Cheonunsan Formation of the Hwasun coal field. The metapsammite of the study area is the late Paleozoic Pyeongan Group by the zircon age rather than Precambrian Galdu and Permian Songjeong Formations are no longer meaningful. Therefore, we propose the upper Paleozoic 'metapelite' and 'metaspammite', or original formation name defined by 1:50,000 geological maps, instead of Galdu and Songjeong Formations.
Keywords
Late Paleozoic; Ogcheon Belt; Metapsammite; Pyeongan Group; SHRIMP U-Pb zircon age;
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Times Cited By KSCI : 2  (Citation Analysis)
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