Zircon U-Pb-Hf isotopes and whole-rock geochemistry of gneissic granites from the Jitang complex in Leiwuqi area, eastern Tibet, China: Record of the closure of the Paleo-Tethys Ocean

doi:10.1016/j.tecto.2014.03.018

	Zircon U-Pb-Hf isotopes and whole-rock geochemistry of gneissic granites from the Jitang complex in Leiwuqi area, eastern Tibet, China: Record of the closure of the Paleo-Tethys Ocean
	Hu, Peiyuan 1; Li, Cai 1; Li, Jiao 2; Wang, Ming 1; Xie, Chaoming 1; Wu, Yanwang 1
刊名	TECTONOPHYSICS
	2014-06-02
卷号	623 页码:83-99
关键词	Tibetan plateau Paleo-Tethys Post-collisional granite Zircon U-Pb dating Petrogenesis
ISSN号	0040-1951
DOI	10.1016/j.tecto.2014.03.018
文献子类	Article
英文摘要	Previous investigations have indicated that the Changning-Menglian (CMSZ) and Longmu Co-Shuanghu (LSSZ) suture zones represent the Paleo-Tethys Ocean of northern Tibet and western Yunnan of China, respectively. However, our understanding of the Paleo-Tethys suture zone in eastern Tibet seems to be incomplete. The North Lancangjiang suture zone (NLSZ) has been hypothesized to mark the Paleo-Tethys Ocean in eastern Tibet. The present study reports new zircon U-Pb ages and Hf isotope data, and whole-rock major and trace element data from the gneissic granites from the Jitang complex in the Leiwuqi area of the NLSZ in order to verify this hypothesis. Six samples of gneissic granites yielded weighted mean Pb-206/U-238 ages of 249-237 Ma. The geochemical data show that the gneissic granites are characterized by high SiO2 (70.79-77.75 wt.%); K2O (2.00-6.13 wt.%); low A/CNK values (<1.1); enrichment in Rb, Th, Ba, and Pb; depletion in Nb, Ta, Sr, Ti, and P; and negative Eu anomalies. These features suggest that the gneissic granites were high-potassium, calcalkaline, and I-type granites. Moreover, the zircon epsilon(Hf)(t) values (from -2.7 to +2.5) and T-DM(C) model ages (1447-1009 Ma) indicate that they were generated by the partial melting of the Meso-proterozoic juvenile crust. These gneissic granites were interpreted to have formed in the post-collisional tectonic setting related to the closure of the Paleo-Tethys Ocean. By combining previously published and the new data, we propose that the NLSZ connects the LSSZ and CMSZ in the Tibetan plateau, and marks a Paleo-Tethys Ocean basin in eastern Tibet. (C) 2014 Elsevier B.V. All rights reserved.
WOS关键词	A-TYPE GRANITES ; ARC/BACK-ARC ASSEMBLAGES ; CENTRAL QIANGTANG AREA ; PLATE TECTONIC CYCLE ; COLLECTOR ICP-MS ; I-TYPE GRANITES ; SOUTHERN TIBET ; NORTHERN TIBET ; TRACE-ELEMENT ; IGNEOUS ROCKS
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000337212400007
资助机构	Chinese National Natural Science Foundation(41072166 ; Chinese National Natural Science Foundation(41072166 ; 41272240) ; 41272240) ; Chinese National Natural Science Foundation(41072166 ; Chinese National Natural Science Foundation(41072166 ; 41272240) ; 41272240) ; Chinese National Natural Science Foundation(41072166 ; Chinese National Natural Science Foundation(41072166 ; 41272240) ; 41272240) ; Chinese National Natural Science Foundation(41072166 ; Chinese National Natural Science Foundation(41072166 ; 41272240) ; 41272240)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/85549]
专题	中国科学院地质与地球物理研究所
通讯作者	Li, Cai
作者单位	1.Jilin Univ, Coll Earth Sci, Changchun 130061, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Hu, Peiyuan,Li, Cai,Li, Jiao,et al. Zircon U-Pb-Hf isotopes and whole-rock geochemistry of gneissic granites from the Jitang complex in Leiwuqi area, eastern Tibet, China: Record of the closure of the Paleo-Tethys Ocean[J]. TECTONOPHYSICS,2014,623:83-99.
APA	Hu, Peiyuan,Li, Cai,Li, Jiao,Wang, Ming,Xie, Chaoming,&Wu, Yanwang.(2014).Zircon U-Pb-Hf isotopes and whole-rock geochemistry of gneissic granites from the Jitang complex in Leiwuqi area, eastern Tibet, China: Record of the closure of the Paleo-Tethys Ocean.TECTONOPHYSICS,623,83-99.
MLA	Hu, Peiyuan,et al."Zircon U-Pb-Hf isotopes and whole-rock geochemistry of gneissic granites from the Jitang complex in Leiwuqi area, eastern Tibet, China: Record of the closure of the Paleo-Tethys Ocean".TECTONOPHYSICS 623(2014):83-99.