东昆仑德龙花岗岩成因及对古特提斯洋演化的制约

陈加杰; 冷成彪; 付乐兵; 赵旭; 邢浩

doi:10.3799/dqkx.2022.328

Volume 49 Issue 2

Feb. 2024

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Article Navigation > Earth Science > 2024 > 49(2): 560-576

Chen Jiajie, Leng Chengbiao, Fu Lebing, Zhao Xu, Xing Hao, 2024. Genesis of Delong Granite in East Kunlun Orogen and Its Implication on the Evolution of Paleo-Tethys Ocean. Earth Science, 49(2): 560-576. doi: 10.3799/dqkx.2022.328

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Chen Jiajie, Leng Chengbiao, Fu Lebing, Zhao Xu, Xing Hao, 2024. Genesis of Delong Granite in East Kunlun Orogen and Its Implication on the Evolution of Paleo-Tethys Ocean. Earth Science, 49(2): 560-576. doi: 10.3799/dqkx.2022.328

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Genesis of Delong Granite in East Kunlun Orogen and Its Implication on the Evolution of Paleo-Tethys Ocean

doi: 10.3799/dqkx.2022.328

Chen Jiajie^{1, 2
,
,},
Leng Chengbiao^{1, 2},
Fu Lebing^{3
,
,
,},
Zhao Xu⁴,
Xing Hao^{1, 2}

1.
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
2.
School of Earth Sciences, East China University of Technology, Nanchang 330013, China
3.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
4.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

Received Date: 2022-03-15
Publish Date: 2024-02-25

Abstract

Abstract

The East Kunlun Orogen is an important part of the Paleo-Tethys domain. The closure time of the Paleo-Tethys Ocean and the reason for decoupling Nd-Hf isotopes of Permian-Triassic magmatic rocks are still controversial. Zircon chronology and whole rock elemental and isotopic analyses have been carried out on the Delong granite in the East Kunlun Orogen. The results show that the Delong granite was emplaced in the Middle Triassic and belong to metaluminous to weakly peraluminous high silica I-type granite, with low Sr/Y and La/Yb ratios, similar to normal island arc magmatic rocks. Isotopic data show enriched Sr-Nd and enriched to depleted zircon Hf isotopic signatures for the Delong granite. These data, together with petrography, indicate that the Delong granite comes from the mixed melting of new and old crust or the remelting of rocks from mixed source areas such as enriched mantle and oceanic plate (mixture of basalt crust and sediments). These special sources contribute to widespread decoupling of ε_Nd(t) and ε_Hf(t) of the Delong granite and even regional contemporaneous intermediate-acid magmatic rocks. Based on the above conclusions and the geological and geochemical characteristics of the rocks regionally, it is inferred that the Paleo-Tethys Ocean was closed at about 240 Ma.
- granite,
- crust remelting,
- Nd-Hf decoupling,
- Paleo-Tethys Ocean,
- ocean-continental conversion,
- East Kunlun Orogen,
- geochemistry

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References(51)

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Genesis of Delong Granite in East Kunlun Orogen and Its Implication on the Evolution of Paleo-Tethys Ocean

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