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Early Evolution of Himalayan Orogenic Belt and Generation of Middle Eocene Magmatism: Constraint From Haweng Granodiorite Porphyry in the Tethyan Himalaya

文献类型：期刊论文

作者Ji, Wei-Qiang1; Wu, Fu-Yuan1; Wang, Jia-Min1; Liu, Xiao-Chi1; Liu, Zhi-Chao2; Zhang, Zhiyong1; Cao, Wenrong3; Wang, Jian-Gang1; Zhang, Chang1
刊名FRONTIERS IN EARTH SCIENCE
出版日期2020-07-09
卷号8页码:17
关键词middle Eocene magmatism granodiorite porphyry Tethyan Himalaya high Sr Y slab breakoff
DOI10.3389/feart.2020.00236
英文摘要Although the Himalayan orogenic belt is dominant by Oligocene to Miocene leucogranites, it initiated magmatic activity from middle Eocene. However, the exact distribution and genesis of early magmatism are yet to be resolved. This study identified new outcrops of middle Eocene magmatism, Haweng granodiorite porphyries, from northwest Langkazi in the northern Tethyan Himalaya, southern Tibet. Identical zircon U-Pb ages were obtained by secondary ion mass spectrometry (17JT13: 45.3 +/- 0.4 Ma; 17JT16: 44.5 +/- 0.8 Ma) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) (17JT15: 44.3 +/- 0.8 Ma; 12FW75: 44.4 +/- 0.6 Ma) methods for different outcrops there. Titanite LA-ICP-MS U-Pb analyses also gave consistent lower intercept ages for samples 17JT13 (45.3 +/- 0.5 Ma) and 17JT15 (44.5 +/- 0.6 Ma). Zircon metamorphic rims of sample 17JT15 recorded a younger thermal event of 29.9 +/- 0.4 Ma. The analyzed samples possess high SiO2(69.98-73.53 wt.%), Al2O3(15.07-16.15 wt.%), variable Na2O (3.94-5.81 wt.%) with Na2O/K2O ratios of 1.57-7.88, and A/CNK values of 1.08-1.27 indicative of sodic peraluminous series. They show variable Sr (342-481 ppm) and Rb (37.9-133 ppm) concentrations and low Rb/Sr ratios (0.10-0.39), radiogenic Sr isotopes [Sr-87/Sr-86((t)): 0.7190-0.7251], and unradiogenic Nd-Hf isotopes with epsilon(Nd)(t) values of -13.54 to -11.55 and epsilon(Hf)(t) values of -11.97 to -9.37, respectively. The variation of major and trace elements, such as increases in Na2O and Sr and decreases in K2O and Rb, resulted from cumulation of plagioclase and crystal fractionation of K-feldspar during magma evolution. The Haweng granodiorite porphyries were derived from partial melting of dominant amphibolites and variable metasedimentary rocks. The newly identified outcrops help conform the EW trending middle Eocene magmatic belt along the Yarlung Tsangpo suture zone, resulting from breakoff of the Neo-Tethyan slab atca.45 Ma.
WOS关键词U-PB GEOCHRONOLOGY ; SOUTHERN TIBET CONSTRAINTS ; HF ISOTOPIC CONSTRAINTS ; INDIA-ASIA COLLISION ; TECTONIC EVOLUTION ; CRUSTAL ANATEXIS ; SLAB BREAKOFF ; LU-HF ; CONTINENTAL SUBDUCTION ; GANGDESE BATHOLITH
资助项目National Key R&D Program of China[2016YFC0600407] ; National Natural Science Foundation of China[41888101] ; National Natural Science Foundation of China[41572055] ; National Natural Science Foundation of China[41772058] ; State Key Laboratory of Lithospheric Evolution grant[SKL-Z201706] ; State Key Laboratory of Lithospheric Evolution grant[2019QZKK0803]
WOS研究方向Geology
语种英语
WOS记录号WOS:000555835000001
出版者FRONTIERS MEDIA SA
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 Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution grant ; State Key Laboratory of Lithospheric Evolution grant ; State Key Laboratory of Lithospheric Evolution grant ; State Key Laboratory of Lithospheric Evolution grant ; 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 Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution grant ; State Key Laboratory of Lithospheric Evolution grant ; State Key Laboratory of Lithospheric Evolution grant ; State Key Laboratory of Lithospheric Evolution grant ; 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 Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution grant ; State Key Laboratory of Lithospheric Evolution grant ; State Key Laboratory of Lithospheric Evolution grant ; State Key Laboratory of Lithospheric Evolution grant ; 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 Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution grant ; State Key Laboratory of Lithospheric Evolution grant ; State Key Laboratory of Lithospheric Evolution grant ; State Key Laboratory of Lithospheric Evolution grant
源URL[http://ir.iggcas.ac.cn/handle/132A11/97609]  
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.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
2.Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangzhou, Peoples R China
3.Univ Nevada, Dept Geol Sci & Engn, Reno, NV 89557 USA
推荐引用方式
GB/T 7714		 Ji, Wei-Qiang,Wu, Fu-Yuan,Wang, Jia-Min,et al. Early Evolution of Himalayan Orogenic Belt and Generation of Middle Eocene Magmatism: Constraint From Haweng Granodiorite Porphyry in the Tethyan Himalaya[J]. FRONTIERS IN EARTH SCIENCE,2020,8:17.
APA Ji, Wei-Qiang.,Wu, Fu-Yuan.,Wang, Jia-Min.,Liu, Xiao-Chi.,Liu, Zhi-Chao.,...&Zhang, Chang.(2020).Early Evolution of Himalayan Orogenic Belt and Generation of Middle Eocene Magmatism: Constraint From Haweng Granodiorite Porphyry in the Tethyan Himalaya.FRONTIERS IN EARTH SCIENCE,8,17.
MLA Ji, Wei-Qiang,et al."Early Evolution of Himalayan Orogenic Belt and Generation of Middle Eocene Magmatism: Constraint From Haweng Granodiorite Porphyry in the Tethyan Himalaya".FRONTIERS IN EARTH SCIENCE 8(2020):17.

入库方式： OAI收割

来源：地质与地球物理研究所

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