西藏南部米拉山地区早侏罗世花岗岩地球化学特征及其地质意义

于云鹏; 解超明; 王明; 范建军; 董宇超; 郝宇杰

doi:10.3799/dqkx.2019.023

Volume 44 Issue 7

Jul. 2019

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Article Navigation > Earth Science > 2019 > 44(7): 2295-2307

Yu Yunpeng, Xie Chaoming, Wang Ming, Fan Jianjun, Dong Yuchao, Hao Yujie, 2019. Geochemical Features and Geological Significance of Early Jurassic Granites in Milashan Area, Southern Tibet. Earth Science, 44(7): 2295-2307. doi: 10.3799/dqkx.2019.023

Citation:

Yu Yunpeng, Xie Chaoming, Wang Ming, Fan Jianjun, Dong Yuchao, Hao Yujie, 2019. Geochemical Features and Geological Significance of Early Jurassic Granites in Milashan Area, Southern Tibet. Earth Science, 44(7): 2295-2307. doi: 10.3799/dqkx.2019.023

Citation:

Yu Yunpeng, Xie Chaoming, Wang Ming, Fan Jianjun, Dong Yuchao, Hao Yujie, 2019. Geochemical Features and Geological Significance of Early Jurassic Granites in Milashan Area, Southern Tibet. Earth Science, 44(7): 2295-2307. doi: 10.3799/dqkx.2019.023

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Geochemical Features and Geological Significance of Early Jurassic Granites in Milashan Area, Southern Tibet

doi: 10.3799/dqkx.2019.023

1.
College of Earth Sciences, Jilin University, Changchun 130061, China
2.
Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural and Resources, Changchun 130061, China

Received Date: 2018-11-30
Publish Date: 2019-07-15

Abstract

Abstract

The petrogenetic differences of the Early Jurassic magmatic rocks within the central and southern Lhasa subterranes are indicative of the early-stage evolution of the Neo-Tethyan Ocean. In this study, we carry out petrography, geochronology and geochemistry analysis on Zongwo granitic pluton and Zhongda granitic pluton on both sides of the Luobadui-Milashan Fault. The zircon U-Pb dating results from two plutons are 193.8±2.2 Ma and 197.5±1.8 Ma, indicating the Early Jurassic magmatism in the study area. Granites samples from the Early Jurassic plutons are characterized by high SiO₂ (69.80%-74.64%) contents, low A/CNK (0.98-1.07), enrichments in lighter rare earth elements (LREEs) and the large-ion-lithophile elements (LILEs) such as Rb, Th, K, and depletions in high-field strength elements (HFSEs) such as Nb, Ta, Ti. Geochemical characteristics show that both samples are typical Ⅰ-type volcanic arc magmatic rocks. Combined with previous research results, it is shown that the Early Jurassic magmatic rocks in the central and southern Lhasa subterranes were formed by the northward subduction of the Neo-Tethyan oceanic crust. Our data, in combination with geochemical and isotopic data indicate that the Early Jurassic magmatic rocks in the southern Lhasa subterrane were mainly derived from the juvenile lower crust, while the magmatic source of the magmatic rocks in the central Lhasa subterrane had more involvement of ancient lower crustal components.
- Gangdese magmatic belt,
- Neo-Tethyan Ocean,
- Early Jurassic granites,
- zircon U-Pb geochronology,
- geochemistry

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References(81)

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Geochemical Features and Geological Significance of Early Jurassic Granites in Milashan Area, Southern Tibet

doi: 10.3799/dqkx.2019.023

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