Paleozoic tectonic evolution of the proto-Korean Peninsula along the East Asian continental margin from detrital zircon U-Pb geochronology and Hf isotope geochemistry  

作　　者：Yirang Jang Sung Won Kim Vinod O.Samuel Sanghoon Kwon Seung-Ik Park M.Santosh Keewook Yi 

机构地区：[1]Department of Earth and Environmental Sciences,Chonnam National University,Gwangju 61186,Republic of Korea [2]Geology Division,Korea Institute of Geoscience and Mineral Resources,Daejeon 34132,Republic of Korea [3]Department of Earth System Sciences,Yonsei University,Seoul 03722,Republic of Korea [4]Department of Geology,Kyungpook National University,Daegu 41566,Republic of Korea [5]School of Earth Sciences and Resources,China University of Geosciences Beijing,Beijing 100083,China [6]Department of Earth Science,University of Adelaide,Adelaide SA 5005,Australia [7]Yonsei Frontiers Lab,Yonsei University,Seoul 03722,Republic of Korea [8]Division of Earth and Environmental Sciences,Korea Basic Science Institute,Chungbuk 28119,Republic of Korea

出　　处：《Geoscience Frontiers》2024年第1期97-117,共21页地学前缘（英文版）

基　　金：supported by the IiKSNF and KETEP grant funded by the Korean government MOTIE (No.2021040101003B);YJ acknowledged NRF-2021R1C1C101057011 through the National Research Foundation of Korea (NRF)funded by the Ministry of Science and ICT,Korea;SK acknowledged the 2017R1A6A1A07015374,2019R1A2C1002211;the KBSI R&D program (Project No.C330430);supported by Basic Research Project grant (GP2021-004)from the KIGAM funded by the Ministry of Science,ICT,and Future Planning,Korea.

摘　　要：Detrital zircon geochronology and Hf isotope analysis can be used for inferring provenance characteristics,and to evaluate the tectonic evolution of sedimentary basins and their link with regional orogenesis.The Paleozoic sequences of the Okcheon Belt consist of the Lower Paleozoic Joseon and the Upper Paleozoic Pyeongan supergroups with Middle Paleozoic hiatus locally on top of the Neoproterozoic bimodal volcanic rocks,reflecting an intracontinental rift setting between the two basements(viz.Gyeonggi and Yeongnam massifs)at southern part of the Korean Peninsula.Our detrital zircon U-Pb ages and Lu-Hf isotope results show that all these Paleozoic strata commonly have Paleoproterozoic and Paleozoic zircon ages with rare Meso-to Neoproterozoic ages.The individual zircon populations display following features,allowing estimation of their sedimentary provenances:(i)The Paleoproterozoic zircons(ca.1.85 Ga and 2.50 Ga)with similar ranges ofεHf(t)values are most common in the basement rocks of the Korean Peninsula,and were sourced from both the Gyeonggi and Yeongnam massifs.(ii)The Meso-to Neoproterozoic zircons,preserved only in the Middle to Late Cambrian clastic sedimentary rocks within the carbonate sequences probably reflect proximal provenance.(iii)The youngest Paleozoic zircons of each formation,almost coincident with their deposition ages,suggest presence of syndepositional magmatism,indicating proximal magmatic sources during their deposition.(iv)The Cambrian-Ordovician zircons,from the Lower Paleozoic sequences,but rare in the successive Upper Paleozoic sequences,suggest a provenance change after the hiatus between the two sedimentary successions.(v)The Permian zircons showing differentεHf(t)values indicate that detrital sources were varied at that time.The integrated results in our study suggest provenance variability linked to diverse tectonic environments,reflecting prolonged subduction-related crustal evolution of the proto-Korean Peninsula during the Paleozoic.

关 键 词：Detrital zircon U-Pb and Hf isotopes Paleozoic metasedimentary rocks Okcheon Belt Taebaeksan zone Korean Peninsula 

分 类 号：P588.121[天文地球—岩石学] P597.3[天文地球—地质学] P542