Middle Paleozoic metamorphic and sedimentary events in the central Korean Peninsula and their geological implications  

作　　者：Byung Choon Lee Sung Won Kim Bo Young Lee Chang Whan Oh Deung-Lyong Cho Weon-Seo Kee 

机构地区：[1]Department of Earth and Environmental Sciences,Chonnam National University,77,Yongbong-ro,Buk-gu,Gwangju 61186,Republic of Korea [2]Geology and Space Division,Korea Institute of Geoscience and Mineral Resources,Daejeon 34132,Republic of Korea [3]Department of Earth and Environmental Sciences,Jeonbuk National University,Jeonju 561-756,Republic of Korea

出　　处：《Geoscience Frontiers》2024年第5期136-161,共26页地学前缘（英文版）

基　　金：supported by the Basic Research Project(GP2020-003,GP2021-004)of the Institute of Geoscience and Mineral Resources(KIGAM);funded by the Ministry of Science,ICT and Future Planning of the Republic of Korea;This work was also supported by the National Research Foundation,Republic of Korea(RS-2023-00210128)。

摘　　要：The Middle Paleozoic tectonic evolution of the central Korean Peninsula(Gyeonggi Massif,Hongseong-Imjingang,and Okcheon zone of Okcheon Belts)remains controversial.Particularly,the occurrence of high-grade metamorphism and sedimentation need further examination.In this study,we conducted zircon U-Pb-rare earth element analyses from in the ultramafic-mafic complex in the central Korean Peninsula(Cheonan and Gapyeong areas)and the Paleozoic metasedimentary rocks in the Okcheon Zone of the Okcheon Belt to constrain the timing of maximum depositional and metamorphic ages.We also examined the metamorphic P-T-t path from garnet-bearing amphibolite in the central Korean Peninsula by pseudosection modeling and geothermobarometer.The results show that(i)some of the ultramafic-mafic complex and metasedimentary rocks in the central Korean Peninsula formed during the Middle Paleozoic(ca.450–374 Ma);(ii)garnet-bearing amphibolite underwent successive metamorphism from amphibolite facies condition(7.5–8.0 kbar and 540–630℃)at pre-peak stage to granulite facies condition(10.9–11.8 kbar and 740–820℃)at peak stage,and then retrograded into amphibolite facies condition(5.7–7.7 kbar and 530–670℃)along the clockwise P–T path during ca.403–362 Ma.This and previous studies suggest that the central Korean Peninsula underwent subduction-related orogenic events during the Middle Paleozoic era,and it is well correlated to those of the orogenic events in the North Qinling belt.

关 键 词：Central Korean Peninsula Middle Paleozoic Orogenic event Pressure-temperature estimation Zircon U-Pb-REE analysis 

分 类 号：P58[天文地球—岩石学]