The birth of the Xigaze forearc basin in southern Tibet

doi:10.1016/j.epsl.2017.02.036

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 > 岩石圈演化国家重点实验室

	The birth of the Xigaze forearc basin in southern Tibet
	Wang, Jian-Gang 1; Hu, Xiumian 2; Garzanti, Eduardo 3; An, Wei 4; Liu, Xiao-Chi1
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2017-05-01
卷号	465 页码:38-47
关键词	Xigaze forearc basin chronostratigraphy provenance subduction initiation Tibet
ISSN号	0012-821X
DOI	10.1016/j.epsl.2017.02.036
文献子类	Article
英文摘要	The stratigraphic succession of a forearc basin provides crucial information on the history of a convergent plate margin. In particular, it helps to establish the origin of the underlying ophiolites and to unravel the earliest evolutionary stage of arc-trench systems, which remain poorly understood. The Xigaze forearc basin in southern Tibet is one of the best examples of a fossil forearc basin. This study illustrates detailed stratigraphic and high-precision SIMS U-Pb zircon geochronological and Hf isotopic data from the Chongdui Formation, representing the very base of the Xigaze forearc-basin succession, and reconstructs when and how the basin was formed. The Chongdui Formation includes tuffaceous chert and siliceous mudrocks deposited directly on top of pillow basalts of the Xigaze ophiolite and conformably overlain by volcaniclastic turbidites. Tuff layers are interbedded throughout the unit, and their U-Pb zircon ages range from 119 to 113 Ma in the lower member and from 113 to 110 Ma in the upper member, broadly consistent with the established radiolarian biostratigraphy. U-Pb ages and Hf isotope signatures of zircons contained in both tuff layers and turbiditic sandstones indicate clear affinity with magmatic rocks of the Lhasa terrane. Direct depositional and chronostratigraphic relationship with the underlying oceanic crust, dated between 131 and 124 Ma, proves that the Xigaze ophiolite is the basement of the Xigaze forearc basin. After an initial prolonged stage of starved siliceous sedimentation, influx of terrigenous detritus began at 113-110 Ma, reflecting the onset of topographic growth and erosion of the Lhasa terrane in response to intense magmatic activity. Formation of the ophiolitic basement during the early stage of subduction and the subsequent topographic growth of the arc source induced by subduction-related magmatism are thus two critical factors for the birth of the Xigaze forearc basin. Similar stratigraphies were identified in the Great Valley and Luzon Central Valley forearc basins, suggesting that the initial geodynamic evolution of the Xigaze forearc basin may be common to many other forearc basins worldwide. (C) 2017 Elsevier B.V. All rights reserved.
WOS关键词	ZIRCON U-PB ; YARLUNG-ZANGBO SUTURE ; LHASA TERRANE ; FACIES ARCHITECTURE ; OCEANIC LITHOSPHERE ; EVOLUTION ; HF ; PROVENANCE ; OPHIOLITE ; CONSTRAINTS
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000400202600004
资助机构	Chinese Academy of Sciences(XDB03010400) ; Chinese Academy of Sciences(XDB03010400) ; National Science Foundation of China(41672109 ; National Science Foundation of China(41672109 ; 41525007) ; 41525007) ; Chinese Academy of Sciences(XDB03010400) ; Chinese Academy of Sciences(XDB03010400) ; National Science Foundation of China(41672109 ; National Science Foundation of China(41672109 ; 41525007) ; 41525007) ; Chinese Academy of Sciences(XDB03010400) ; Chinese Academy of Sciences(XDB03010400) ; National Science Foundation of China(41672109 ; National Science Foundation of China(41672109 ; 41525007) ; 41525007) ; Chinese Academy of Sciences(XDB03010400) ; Chinese Academy of Sciences(XDB03010400) ; National Science Foundation of China(41672109 ; National Science Foundation of China(41672109 ; 41525007) ; 41525007)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/42517]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Wang, Jian-Gang
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210023, Jiangsu, Peoples R China 3.Univ Milano Bicocca, Dept Earth & Environm Sci, I-20126 Milan, Italy 4.Hefei Univ Technol, Sch Resources & Environm Engn, Hefei 230009, Peoples R China
推荐引用方式 GB/T 7714	Wang, Jian-Gang,Hu, Xiumian,Garzanti, Eduardo,et al. The birth of the Xigaze forearc basin in southern Tibet[J]. EARTH AND PLANETARY SCIENCE LETTERS,2017,465:38-47.
APA	Wang, Jian-Gang,Hu, Xiumian,Garzanti, Eduardo,An, Wei,&Liu, Xiao-Chi.(2017).The birth of the Xigaze forearc basin in southern Tibet.EARTH AND PLANETARY SCIENCE LETTERS,465,38-47.
MLA	Wang, Jian-Gang,et al."The birth of the Xigaze forearc basin in southern Tibet".EARTH AND PLANETARY SCIENCE LETTERS 465(2017):38-47.