The Devonian back-arc basin and Triassic arc-continent collision along the Imjingang belt in the Korean Peninsula and their tectonic meaning

doi:10.1016/j.lithos.2019.01.011

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院矿产资源研究重点实验室

	The Devonian back-arc basin and Triassic arc-continent collision along the Imjingang belt in the Korean Peninsula and their tectonic meaning
	Young, Bo 1,2; Oh, Chang Whan 1,2; Cho, Deung Lyong 3; Zhai, Mingguo 4; Lee, Byung Choon 1,2; Peng, Peng 4; Yi, Keewook 5,6
刊名	LITHOS
	2019-03-01
卷号	328 页码:276-296
关键词	Imjingang belt Amphibolite Devonian Back-arc basin Triassic Intermediate-P/T metamorphism
ISSN号	0024-4937
DOI	10.1016/j.lithos.2019.01.011
英文摘要	The Imjingang belt, which is located between the Nangrim and Gyeonggi Massifs, is divided into the Imjin group in the north and the Samgot unit in the south. The southeastern part of the Imjin group, which is located within South Korea, is called the Jingok unit. The Samgot unit consists of amphibolite, psammitic schist, meta-alkali granite and meta-calc-silicate rock. The amphibolite experienced prograde metamorphism from 648-550 degrees C/13-11 kbar to 715 degrees C/11 kbar and was then retrograded to ca. 579-569 degrees C/6.7-6.3 kbar. The psammitic schist was metamorphosed at ca. 710 degrees C/11 kbar and then retrograded to ca. 670-660 degrees C/11-10 kbar. These data indicate that the Samgot unit underwent clockwise prograde metamorphism with peak metamorphism conditions of 715-710 degrees C/11 kbar, which is confirmed by pseudosection analysis. The results of this and previous studies indicate that the metamorphic grade increases southward from the garnet and staurolite zones (630-500 degrees C/9-3 kbar) through the kyanite zone (710-665 degrees C/9 kbar) in the Jingok unit to the Samgot unit (715-710 degrees C/11 kbar) of the Imjingang belt. This metamorphic pattern indicates that the Imjingang belt underwent regional intermediate-P/T metamorphism. The SHRIMP U-Pb age dating of zircons from the amphibolite and meta-alkali granite yields intrusion ages of ca. 371-361 Ma and 373 Ma, respectively. From the psammitic schist, ages of ca. 401-370 Ma are obtained from the youngest detrital zircons and ages of ca. 251-249 Ma are obtained from the metamorphic zircons. In addition, the SHRIMP U-Pb age dating of titanite from the amphibolite yields a retrograde metamorphic age of ca. 229-214 Ma. The whole-rock chemical composition of the amphibolite plots in the back-arc basin basalt field on the tectonic discrimination diagrams. These data indicate that the Imjingang belt, including the Samgot unit, consists of Devonian sedimentary rocks that were deposited in a back-arc basin and intruded by mafic and felsic igneous rocks at ca. 373-361 Ma. Finally, the Imjingang belt underwent intermediate-P/T metamorphism during the Triassic (251-249 Ma) instead of high-P/T metamorphism, indicating that the Imjingang belt is not the extension of the Dabie-Sulu collision belt but a back-arc basin within the North China Craton that underwent intermediate-P/T metamorphism due to the closure of the back-arc basin (arc-continent collision) during the collision between the North and South China Cratons along the Hongseong-Odesan collision belt within the Gyeonggi Massif. (C) 2019 Published by Elsevier B.V.
资助项目	National Research Foundation of Korea (NRF) - Korean Government[NRF-2017R1A2B2011224] ; National Research Foundation of Korea (NRF) - Korean Government[NRF-2017K1A1A2013180]
WOS关键词	U-PB AGES ; SOUTH CHINA COLLISION ; GYEONGGI MASSIF ; TRACE-ELEMENT ; DABIE-SULU ; METAMORPHIC EVENTS ; TAEAN FORMATION ; HONGCHEON AREA ; EAST-ASIA ; EVOLUTION
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000463308800019
资助机构	National Research Foundation of Korea (NRF) - Korean Government ; National Research Foundation of Korea (NRF) - Korean Government ; National Research Foundation of Korea (NRF) - Korean Government ; National Research Foundation of Korea (NRF) - Korean Government ; National Research Foundation of Korea (NRF) - Korean Government ; National Research Foundation of Korea (NRF) - Korean Government ; National Research Foundation of Korea (NRF) - Korean Government ; National Research Foundation of Korea (NRF) - Korean Government
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/91305]
专题	地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者	Oh, Chang Whan
作者单位	1.Chonbuk Natl Univ, Dept Earth & Environm Sci, 567 Baekje Daero, Jeonju Si 54896, Jeollabuk Do, South Korea 2.Chonbuk Natl Univ, Earth & Environm Sci Syst Res Ctr, 567 Baekje Daero, Jeonju Si 54896, Jeollabuk Do, South Korea 3.Korea Inst Geosci & Mineral Resources, Div Geol Res, Daejeon 34132, South Korea 4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 5.Korea Basic Sci Inst, Div Earth Sci, Ochang 363883, South Korea 6.Korea Basic Sci Inst, Div Environm Sci, Ochang 363883, South Korea
推荐引用方式 GB/T 7714	Young, Bo,Oh, Chang Whan,Cho, Deung Lyong,et al. The Devonian back-arc basin and Triassic arc-continent collision along the Imjingang belt in the Korean Peninsula and their tectonic meaning[J]. LITHOS,2019,328:276-296.
APA	Young, Bo.,Oh, Chang Whan.,Cho, Deung Lyong.,Zhai, Mingguo.,Lee, Byung Choon.,...&Yi, Keewook.(2019).The Devonian back-arc basin and Triassic arc-continent collision along the Imjingang belt in the Korean Peninsula and their tectonic meaning.LITHOS,328,276-296.
MLA	Young, Bo,et al."The Devonian back-arc basin and Triassic arc-continent collision along the Imjingang belt in the Korean Peninsula and their tectonic meaning".LITHOS 328(2019):276-296.