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Petrogenesis of Triassic granitoids in the East Kunlun Orogenic Belt, northern Tibetan Plateau and their tectonic implications
Shao, Fengli1,2,3; Niu, Yaoling1,2,4; Liu, Yi5; Chen, Shuo1,2,3; Kong, Juanjuan1,2,3; Duan, Meng5
2017-06-01
发表期刊LITHOS
卷号282页码:33-44
文章类型Article
摘要The East Kunlun Orogenic Belt (EKOB), an important part of the Greater Tibetan Plateau, is an ideal region for understanding the tectonic evolution of the Anyemagen Ocean. Here, we present zircon U-Pb ages, bulk-rock major and trace element analyses and Sr-Nd-Hf isotope compositions on representative samples of the syn-collisional Dulan batholith at the eastern end of the EKOB. The zircon U-Pb age data indicate that the bulk of the Dulan batholith was emplaced at 240-235 Ma. The granitoids have high- to medium-K and metaluminous characteristics. They are enriched in large ion lithophile elements (LILEs) and light rare earth elements (LREEs) and depleted in some high field strength elements (HFSEs, e.g., Nb and Ta), while having a flat heavy REE (HREEs) pattern. The mafic magmatic enclaves (MMES) share the same age, mineralogy and indistinguishable Sr-Nd-Hf isotopes with their granitoid hosts except for the higher HREE abundances. We show that the MMES represent cumulate formed at earlier stages of the same magmatic system. The trace element data (e.g., Nb/Th, Ta/U) and inherited mantle isotopic characteristics of the Dulan batholith are also consistent with an origin via partial melting of the last fragments of underthrusting ocean crust. Simple mass balance calculations using the Sr-Nd-Hf isotopic data show that similar to 85% Paleo-Tethys MORB and similar to 15% mature crustal material (the Proterozoic gneiss of the study area) contribute to the source of the granitoids. The Dulan batholith shows compositional similarities to the bulk continental curst with inherited mantle isotopic signatures. The syn-collisional felsic magmatism must have contributed to the net continental crust growth in the EKOB. We infer that the Kunlun and Qinling orogens may actually be one single orogen offset later by the Wenquan fault system. (C) 2017 Elsevier B.V. All rights reserved.
关键词East Kunlun Granitoids Dulan Batholith Syn-collisional Continental Crust Growth
DOI10.1016/j.lithos.2017.03.002
收录类别SCI
语种英语
WOS记录号WOS:000401388100004
引用统计
被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/136858
专题海洋地质与环境重点实验室
作者单位1.Chinese Acad Sci, Inst Oceanol, 7 Nanhai Rd, Qingdao 266071, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
5.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
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Shao, Fengli,Niu, Yaoling,Liu, Yi,et al. Petrogenesis of Triassic granitoids in the East Kunlun Orogenic Belt, northern Tibetan Plateau and their tectonic implications[J]. LITHOS,2017,282:33-44.
APA Shao, Fengli,Niu, Yaoling,Liu, Yi,Chen, Shuo,Kong, Juanjuan,&Duan, Meng.(2017).Petrogenesis of Triassic granitoids in the East Kunlun Orogenic Belt, northern Tibetan Plateau and their tectonic implications.LITHOS,282,33-44.
MLA Shao, Fengli,et al."Petrogenesis of Triassic granitoids in the East Kunlun Orogenic Belt, northern Tibetan Plateau and their tectonic implications".LITHOS 282(2017):33-44.
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