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Identification of Forearc Sediments in the Milin-Zedong Region and Their Constraints on Tectonomagmatic Evolution of the Gangdese Arc, Southern Tibet

文献类型：期刊论文

作者Zhang, Shao-Hua1,2; Ji, Wei-Qiang2; Zhang, Hao2; Chen, Guo-Hui2; Wang, Jian-Gang2; Meng, Zhong-Yu1,2; Wu, Fu-Yuan2
刊名LITHOSPHERE
出版日期2020-06-01
卷号2020期号:1页码:20
ISSN号1941-8264
DOI10.2113/2020/8835259
英文摘要The Xigaze forearc sediments revealed the part of the tectonomagmatic history of the Gangdese arc that the bedrocks did not record. However, the sediments' development is restricted to the region around and west of Xigaze City. Whether the eastern segment of the arc had a corresponding forearc basin is yet to be resolved. In this study, a field-based stratigraphic study, detrital zircon U-Pb geochronology (15 samples), and Hf isotopic analyses (11 of the 15 samples) were carried out on four sections in the Milin-Zedong area, southeast Tibet. The analytical results revealed the existence of three distinct provenances. The lower sequence is characterized by fine-grained sandstone, interbedded mudstone, and some metamorphic rocks (e.g., gneiss and schist). The detrital zircon U-Pb age distribution of this sequence is analogous to those of the Carboniferous-Permian strata and metasediments of the Nyingtri group in the Lhasa terrane. The middle and upper sequences are predominantly composed of medium- to coarse-grained volcaniclastic/quartzose sandstones, which are generally interbedded with mudstone. The detrital zircon U-Pb ages and Hf isotope signatures indicate that the middle sequences are Jurassic to Early Cretaceous in age (similar to 200-100 Ma) and show clear affinity with the Gangdese arc rocks, that is, positive epsilon(Hf) (t) values. In contrast, the upper sequences are characterized by Mesozoic detrital zircons (150-100 Ma) and negative epsilon(Hf) (t) values, indicative of derivation from the central Lhasa terrane. The overall compositions of the detrital zircon U-Pb ages and Hf isotopes of the middle to upper sequences resemble those of the Xigaze forearc sediments, implying that related forearc sediments may have been developed in the eastern part of the Gangdese arc. It is possible that the forearc equivalents were eroded or destroyed during the later orogenesis. Additionally, the detrital zircons from these forearc sediments indicate that this segment of the Gangdese arc experienced more active and continuous magmatism from the Early Jurassic to Early Cretaceous than its bedrock records indicate.
WOS关键词ZIRCON U-PB ; EARLY PALEOZOIC TECTONISM ; HF ISOTOPIC COMPOSITIONS ; LHASA TERRANE ; LU-HF ; GEOCHRONOLOGICAL EVIDENCE ; CONTINENTAL COLLISION ; CRUSTAL GROWTH ; TRACE-ELEMENT ; THRUST SHEET
资助项目National Key R&D Program of China[2016YFC0600407] ; National Science Foundation of China[41888101] ; National Science Foundation of China[41572055]
WOS研究方向Geochemistry & Geophysics ; Geology
语种英语
WOS记录号WOS:000617908500018
出版者GEOSCIENCEWORLD
资助机构National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/100053]  
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Ji, Wei-Qiang
作者单位1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Shao-Hua,Ji, Wei-Qiang,Zhang, Hao,et al. Identification of Forearc Sediments in the Milin-Zedong Region and Their Constraints on Tectonomagmatic Evolution of the Gangdese Arc, Southern Tibet[J]. LITHOSPHERE,2020,2020(1):20.
APA Zhang, Shao-Hua.,Ji, Wei-Qiang.,Zhang, Hao.,Chen, Guo-Hui.,Wang, Jian-Gang.,...&Wu, Fu-Yuan.(2020).Identification of Forearc Sediments in the Milin-Zedong Region and Their Constraints on Tectonomagmatic Evolution of the Gangdese Arc, Southern Tibet.LITHOSPHERE,2020(1),20.
MLA Zhang, Shao-Hua,et al."Identification of Forearc Sediments in the Milin-Zedong Region and Their Constraints on Tectonomagmatic Evolution of the Gangdese Arc, Southern Tibet".LITHOSPHERE 2020.1(2020):20.

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来源：地质与地球物理研究所

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