拉萨地块东部米拉山地区中新世地层的特征及构造意义

张博川; 范建军; 罗安波; 于云鹏; 郝宇杰

doi:10.3799/dqkx.2019.149

Volume 44 Issue 7

Jul. 2019

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Article Navigation > Earth Science > 2019 > 44(7): 2392-2407

Zhang Bochuan, Fan Jianjun, Luo Anbo, Yu Yunpeng, Hao Yujie, 2019. Characteristics and Tectonic Significance of the Miocene Strata in the Milashan Area, Eastern Lhasa Terrane. Earth Science, 44(7): 2392-2407. doi: 10.3799/dqkx.2019.149

Citation:

Zhang Bochuan, Fan Jianjun, Luo Anbo, Yu Yunpeng, Hao Yujie, 2019. Characteristics and Tectonic Significance of the Miocene Strata in the Milashan Area, Eastern Lhasa Terrane. Earth Science, 44(7): 2392-2407. doi: 10.3799/dqkx.2019.149

Citation:

Zhang Bochuan, Fan Jianjun, Luo Anbo, Yu Yunpeng, Hao Yujie, 2019. Characteristics and Tectonic Significance of the Miocene Strata in the Milashan Area, Eastern Lhasa Terrane. Earth Science, 44(7): 2392-2407. doi: 10.3799/dqkx.2019.149

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Characteristics and Tectonic Significance of the Miocene Strata in the Milashan Area, Eastern Lhasa Terrane

doi: 10.3799/dqkx.2019.149

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

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

Abstract

Abstract

Miocene is an important period for the thickening and uplifting of the Lhasa terrane. A set of Miocene strata were recently identified in the eastern Lhasa terrane. It can be divided into three eruption cycles, and consists of rhyolite, dacite, pyroclastic rock, obsidian and lithic sandstone. Zircon U-Pb dating shows that the strata formed during 17.2-18.2 Ma. Whole-rock major and trace element analysis and zircon Hf isotope analysis show that the rhyolite has the geochemical characteristics of potassic volcanic rocks, and is derived from the partial melting of a middle-lower crust. The dacite has the geochemical characteristics of adakite related with A-type granite, and is derived from the partial melting of a new thickened lower crust. The coexistence of the potassic and adakitic rocks enriches the research of the Miocene volcanic rocks, and provides new evidence for the Miocene lithospheric detachment model in the Tibetan Plateau.
- Tibetan Plateau,
- eastern Lhasa terrane,
- Miocene,
- potassic rock,
- adakite,
- geochemistry

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References(55)

References

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Characteristics and Tectonic Significance of the Miocene Strata in the Milashan Area, Eastern Lhasa Terrane

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