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

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

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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 zir-con 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 metamor-phism 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 oro-genic events during the Middle Paleozoic era,and it is well correlated to those of the orogenic events in the North Qinling belt.

Central Korean PeninsulaMiddle PaleozoicOrogenic eventPressure-temperature estimationZircon U-Pb-REE analysis

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

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Department of Earth and Environmental Sciences,Chonnam National University,77,Yongbong-ro,Buk-gu,Gwangju 61186,Republic of Korea

Geology and Space Division,Korea Institute of Geoscience and Mineral Resources,Daejeon 34132,Republic of Korea

Department of Earth and Environmental Sciences,Jeonbuk National University,Jeonju 561-756,Republic of Korea

Basic Research Project of the Institute of Geoscience and Mineral Resources(KIGAM)Basic Research Project of the Institute of Geoscience and Mineral Resources(KIGAM)Ministry of Science,ICT and Future Planning of the Republic of KoreaNational Research Foundation,Republic of Korea

GP2020-003GP2021-004RS-2023-00210128

2024

10.1016/j.gsf.2024.101840

地学前缘(英文版)
中国地质大学（北京） 北京大学

地学前缘(英文版)

CSTPCD
影响因子：0.576
ISSN：1674-9871
年,卷(期)：2024.15(5)
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