青藏高原中部麻米地区晚侏罗世火山岩岩石成因及其地质意义

刘海永; 岳鋆璋; 顿珠旺堆; 旺姆; 毛国正; 吴浩

doi:10.3799/dqkx.2018.382

Volume 44 Issue 7

Jul. 2019

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Article Navigation > Earth Science > 2019 > 44(7): 2368-2378

Liu Haiyong, Yue Yunzhang, Dunzhu Wangdui, Wang Mu, Mao Guozheng, Wu Hao, 2019. Petrogenesis and Geological Significance of Late Jurassic Volcanic Rocks in Mami Area, Central Tibetan Plateau. Earth Science, 44(7): 2368-2378. doi: 10.3799/dqkx.2018.382

Citation:

Liu Haiyong, Yue Yunzhang, Dunzhu Wangdui, Wang Mu, Mao Guozheng, Wu Hao, 2019. Petrogenesis and Geological Significance of Late Jurassic Volcanic Rocks in Mami Area, Central Tibetan Plateau. Earth Science, 44(7): 2368-2378. doi: 10.3799/dqkx.2018.382

Citation:

Liu Haiyong, Yue Yunzhang, Dunzhu Wangdui, Wang Mu, Mao Guozheng, Wu Hao, 2019. Petrogenesis and Geological Significance of Late Jurassic Volcanic Rocks in Mami Area, Central Tibetan Plateau. Earth Science, 44(7): 2368-2378. doi: 10.3799/dqkx.2018.382

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Petrogenesis and Geological Significance of Late Jurassic Volcanic Rocks in Mami Area, Central Tibetan Plateau

doi: 10.3799/dqkx.2018.382

1.
Tibet Institute of Geological Survey, Lhasa 850000, China
2.
The Second Geological Party, Tibet Bureau of Geology and Mineral Exploration and Development, Lhasa 850000, China
3.
Regional Geological Survey Party, Tibet Bureau of Geology and Mineral Exploration and Development, Duilong 851400, China
4.
The Western Exploration Group, Tibet Bureau of Geology and Mineral Exploration and Development, Duilong 851400, China
5.
School of Earth Sciences and Engineering, Hohai University, Nanjing 210098, China

Received Date: 2018-10-25
Publish Date: 2019-07-15

Abstract

Abstract

A new Late Jurassic-Early Cretaceous magmatic belt has been identified in the central Tibetan Plateau. This paper reports two zircon U-Pb ages and also new whole-rock major and trace element data of the newly discovered volcanic rocks in Mami area. These volcanic rocks were dated as Late Jurassic (152-150 Ma). The studied samples are characterized by high SiO₂ content, high alkali, low MgO, and low P₂O₅ abundances, with significant depletion in Eu, Sr, and Ba, suggesting a geochemical affinity with highly fractionated I-type granites. It is concluded that the volcanic rocks were derived by partial melting of ancient mafic lower crust, followed by fractional crystallization. Our research propose that Late Jurassic-Early Cretaceous magmatic magmatism occurred in an oceanic subduction setting, likely related to the northward subduction of the Neo-Tethys oceanic lithosphere.
- central Tibetan Plateau,
- Late Jurassic,
- volcanics,
- zircon U-Pb dating,
- geochemistry

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References(43)

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Petrogenesis and Geological Significance of Late Jurassic Volcanic Rocks in Mami Area, Central Tibetan Plateau

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