气候变化领域集成服务门户(CCPortal): U-Pb-Hf isotope compositions of detrital zircons from Tongtian River sediments of northern-central Tibetan Plateau: Implications for the closure of the Jinshajiang Ocean

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DOI	10.1016/j.chemer.2023.126018
	U-Pb-Hf isotope compositions of detrital zircons from Tongtian River sediments of northern-central Tibetan Plateau: Implications for the closure of the Jinshajiang Ocean
	Liang, Qiankun; Kang, Huan; Chen, Yuelong; Zhang, Huazhen; Wang, Dan
发表日期	2023
ISSN	0009-2819
EISSN	1611-5864
卷号	83 期号:4
英文摘要	The closure time of the Jinshajiang Ocean (a branch ocean of the Paleo-Tethys) has been widely debated due to the complex structure and strong deformation of the northern-central Tibetan Plateau. In this paper, the U-Pb-Hf isotope compositions of detrital zircons from Tongtian River sand sediments from the northern-central Tibetan Plateau were analyzed via laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). The U-Pb ages of the detrital zircons from Tongtian River sand sediments were distributed in six major groups: 2685-2346 Ma, 2035-1676 Ma, 1220-580 Ma, 544-407 Ma, 297-157 Ma, and 46-20 Ma. The epsilon Hf(t) values (range from-30 to +19) of the detrital zircons varied within a wide range from negative to positive, indicating that the zircons were sourced from diverse host magmas. The 46-20 Ma zircons and their Hf isotope compositions reveal that the far-field effect of the Cenozoic India-Eurasia plate collision triggered reworking of the Neoproterozoic basement of the North Qiangtang terrane. The U-Pb-Hf isotope compositions of these detrital zircons indicate that the Tongtian River sand sediments are composed of a mixture of materials from the Bayan Har-Songpan Ganzi terrane and the North Qiangtang terrane, with a contribution ratio of 3:7. The U-Pb ages and Hf isotope compositions of the zircons from the Tongtian River sediments and regional igneous rocks suggest that the epsilon Hf(t) values of the Permian zircons are predominantly positive while those of the Triassic, especially the Late Triassic, are negative. This marked shift most likely indicates that the closure of the Jinshajiang Ocean occurred by at least the Late Triassic.
关键词	Tibetan Plateau Tongtian River Detrital zircon U-Pb-Hf isotopic compositions Jinshajiang Ocean
英文关键词	TRIASSIC ARC MAGMATISM; INDO-CHINA BLOCK; TECTONIC EVOLUTION; SONGPAN-GANZI; EASTERN TIBET; LU-HF; CONTINENTAL-CRUST; CENTRAL QIANGTANG; OROGENIC BELT; FOLD BELT
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:001146607700001
来源期刊	GEOCHEMISTRY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283888
作者单位	China University of Geosciences - Beijing; China Earthquake Administration
推荐引用方式 GB/T 7714	Liang, Qiankun,Kang, Huan,Chen, Yuelong,et al. U-Pb-Hf isotope compositions of detrital zircons from Tongtian River sediments of northern-central Tibetan Plateau: Implications for the closure of the Jinshajiang Ocean[J],2023,83(4).
APA	Liang, Qiankun,Kang, Huan,Chen, Yuelong,Zhang, Huazhen,&Wang, Dan.(2023).U-Pb-Hf isotope compositions of detrital zircons from Tongtian River sediments of northern-central Tibetan Plateau: Implications for the closure of the Jinshajiang Ocean.GEOCHEMISTRY,83(4).
MLA	Liang, Qiankun,et al."U-Pb-Hf isotope compositions of detrital zircons from Tongtian River sediments of northern-central Tibetan Plateau: Implications for the closure of the Jinshajiang Ocean".GEOCHEMISTRY 83.4(2023).