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http://dx.doi.org/10.9719/EEG.2020.53.4.397

Occurrence of the lowermost part of the Yucheon Group and its SHRIMP U-Pb ages in Hyeonpoong and Bugok areas  

Ghim, Yong Sik (School of Earth System Science, Kyungpook National University)
Ko, Kyoungtae (Geology Division, Korea Institute of Geoscience and Mineral Resources)
Lee, Byung Choon (Geology Division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Economic and Environmental Geology / v.53, no.4, 2020 , pp. 397-411 More about this Journal
Abstract
The Cretaceous Yucheon Group is volcano-sedimentary successions that are formed by volcanic activities of the Gyeongsang Volcanic Arc. Lack of the detailed field researches on the Yucheon Group results in poor understanding of the formation time and the tempo-spatial development of the volcanic arc. Also, this causes difficulties to reconstruct the depositional history from the Sindong and Hayang groups to the Yucheon Group. In this study, we conducted field research targeting to the interface between topmost part of the Hayang Group and the lowermost part of the Yucheon Group from Hyeonpoong to Bugok areas. We also identified depositional timing of the lowermost part of the Yucheon Group using SHRIMP U-Pb zircon age dating. This Yucheon Group is composed of tuff and lapilli tuff, conformably overlying the Jindong Formation. The results of SHRIMP U-Pb zircon age are 97 to 96 Ma, indicating cessation of deposition of the Hayang Group at 97 to 96 Ma by input of pyroclastic materials into the Jinju Subbasin during the explosive volcanic eruptions from the Gyeongsang Volcanic Arc. In comparison with field researches and results of LA-ICP-MS zircon U-Pb age dating (88-85 Ma) of the lowermost part of the Yucheon Group in Gyeongju areas, the volcanic activities that formed Yucheon Group and their influence ranges varied tempo-spatially. This is probably due to distance difference from the volcanic arc or establishment of the paleo-drainage system from the Gyeongsang Volcanic Arc to nearby lowlands.
Keywords
late cretaceous; yucheon group; gyeongsang volcanic arc; volcanic activities; jindong formation;
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