拉萨地体中部古新世早期灯垌火山-侵入杂岩成因及地壳硅质岩浆演化

周逍遥; 张玉修; 张吉衡; 胡俊成; 李武毅; 黄荣才; 廖驾; 王家浩; 唐显春; 朱利东

doi:10.3799/dqkx.2019.073

Volume 46 Issue 2

Feb. 2021

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Article Navigation > Earth Science > 2021 > 46(2): 474-488

Zhou Xiaoyao, Zhang Yuxiu, Zhang Jiheng, Hu Juncheng, Li Wuyi, Huang Rongcai, Liao Jia, Wang Jiahao, Tang Xianchun, Zhu Lidong, 2021. Petrogenesis of Early Paleocene Dengtong Volcanic-Plutonic Complex in Central Lhasa Terrane and Evolution of Crustal High-Silica Magma. Earth Science, 46(2): 474-488. doi: 10.3799/dqkx.2019.073

Citation:

Zhou Xiaoyao, Zhang Yuxiu, Zhang Jiheng, Hu Juncheng, Li Wuyi, Huang Rongcai, Liao Jia, Wang Jiahao, Tang Xianchun, Zhu Lidong, 2021. Petrogenesis of Early Paleocene Dengtong Volcanic-Plutonic Complex in Central Lhasa Terrane and Evolution of Crustal High-Silica Magma. Earth Science, 46(2): 474-488. doi: 10.3799/dqkx.2019.073

Citation:

Zhou Xiaoyao, Zhang Yuxiu, Zhang Jiheng, Hu Juncheng, Li Wuyi, Huang Rongcai, Liao Jia, Wang Jiahao, Tang Xianchun, Zhu Lidong, 2021. Petrogenesis of Early Paleocene Dengtong Volcanic-Plutonic Complex in Central Lhasa Terrane and Evolution of Crustal High-Silica Magma. Earth Science, 46(2): 474-488. doi: 10.3799/dqkx.2019.073

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Petrogenesis of Early Paleocene Dengtong Volcanic-Plutonic Complex in Central Lhasa Terrane and Evolution of Crustal High-Silica Magma

doi: 10.3799/dqkx.2019.073

1.
College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
2.
Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing 100049, China
3.
Gold Geological Party No. 11 of the CAPF, Lhasa 850000, China
4.
Sinoprobe Center, Chinese Academy of Geological Sciences, Beijing 100037, China
5.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China

Received Date: 2019-09-15
Publish Date: 2021-02-15

Abstract

Abstract

Genetic study on the granite-rhyolite associations is an essential way to uncover the mechanism of crustal evoltion. Geochemistry, zircon U-Pb dating, and oxygen isotopes of the Dengtong volcanic-plutonic complex in the central Lhasa Terrane are reported in this paper. Zircon SHRIMP U-Pb ages for the granite porphyry, rhyolite and rhyolitic ignimbrite samples are 64.1±0.8 Ma, 62.9±0.7 Ma and 63.2±0.7 Ma, respectively. These rocks display similar geochemical characterstics. They are high K calc-alkaline and weakly peraluminous, exhibit HFSE depletion, LILE and LREE enrichment, and flat HREE, with consistent zircon oxygen isotopic composition (δ¹⁸O=6.15‰-7.34‰), suggesting consecutive magma evolution of cognate origin. The rhyolite and granite porphyry are depleted in Ba, Sr, P and Ti with significant negative Eu anomaly, indicating conspicuous fractionation. The rhyolite presents the extracted melt from the mush enriched in mineral phases, while the granite porphyry generated from the mush by fractional crystallization. The rhyolitic ignimbrite displays relatively weak negative Eu anomaly, and was generated by the eruption of the residual magma mush. Considering the temporal and spatial distribution of the Paleocene magmatic rocks along the central Lhasa Terrane, it is proposed that the roll-back of the Yarlung-Zangbo Neo-Tethyan oceanic lithosphere subducted beneath the Lhasa Terrane was responsible for the geodynamic regime of the Dengtong volcanic-plutonic complex. The upwelling of the asthenosphere material caused partial melting of lower crust, and resulted in intrusive or volcanic rocks.
- magma evolution,
- volcanic-plutonic complex,
- zircon U-Pb-O isotopes,
- Lhasa Terrane,
- geochronology,
- geochemistry

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Petrogenesis of Early Paleocene Dengtong Volcanic-Plutonic Complex in Central Lhasa Terrane and Evolution of Crustal High-Silica Magma

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