东昆仑洪水河地区三叠纪花岗岩类的岩石成因及其对古特提斯造山作用的启示

李福睿; 熊富浩; 马昌前; 赵涵; 龚婷婷

doi:10.3799/dqkx.2022.165

Volume 49 Issue 2

Feb. 2024

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Article Navigation > Earth Science > 2024 > 49(2): 639-655

Li Furui, Xiong Fuhao, Ma Changqian, Zhao Han, Gong Tingting, 2024. Petrogenesis of Triassic Hongshuihe Granitoids in East Kunlun: Implications for the Paleo-Tethyan Orogeny. Earth Science, 49(2): 639-655. doi: 10.3799/dqkx.2022.165

Citation:

Li Furui, Xiong Fuhao, Ma Changqian, Zhao Han, Gong Tingting, 2024. Petrogenesis of Triassic Hongshuihe Granitoids in East Kunlun: Implications for the Paleo-Tethyan Orogeny. Earth Science, 49(2): 639-655. doi: 10.3799/dqkx.2022.165

Citation:

Li Furui, Xiong Fuhao, Ma Changqian, Zhao Han, Gong Tingting, 2024. Petrogenesis of Triassic Hongshuihe Granitoids in East Kunlun: Implications for the Paleo-Tethyan Orogeny. Earth Science, 49(2): 639-655. doi: 10.3799/dqkx.2022.165

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Petrogenesis of Triassic Hongshuihe Granitoids in East Kunlun: Implications for the Paleo-Tethyan Orogeny

doi: 10.3799/dqkx.2022.165

Li Furui^{1
,
,},
Xiong Fuhao^{1, 2
,
,
,},
Ma Changqian³,
Zhao Han^{1, 4},
Gong Tingting^{1, 4}

1.
College of Earth Science, Chengdu University of Technology, Chengdu 610059, China
2.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610059, China
3.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
4.
Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation of Ministry of Natural Resources, Chengdu 610059, China

Received Date: 2022-12-17
Publish Date: 2024-02-25

Abstract

Abstract

Triassic magmatic rocks in East Kunlun are the key probe to study the Paleo-Tethyan orogeny. This paper presents a detailed petrological, chronological, geochemical and Sr-Nd isotopic study on the Hongshuihe granitoids in the East Kunlun to constrain their petrogenesis and dynamic setting. Zircon U-Pb chronology shows that the crystallization ages of the granodiorite and granites in the Hongshuihe pluton are 243.0 Ma±3.3 Ma and 244.0 Ma±3.1 Ma, respectively. The studied rocks are metaluminous, high-K calc-alkaline Ⅰ-type granitoids, but the granodiorites have lower Na₂O/K₂O ratios (0.78-0.96) and higher Mg^# (42-45) than the granites. All rocks are enriched in large ion lithophile elements but depleted in high field strength elements, and have an enriched Sr-Nd isotopic composition [ε_Nd(t)=-6.53~-4.99, I_sr=0.706 871~0.709 126]. Comprehensive studies indicate that the Hongshuihe middle Triassic granitoids were formed in the continental arc environment during the East Kunlun Paleo-Tethyan oceanic crust subduction, and their parental magmas were derived by partial melting of Mesoproterozoic metagreywackes followed by varying degrees of crust-mantle mixing and fractional crystallization. This study also shows that the re-working of ancient continental crust with a certain amount of crust-mantle mixing is the main evolutionary mechanism of Middle Triassic continental crust in the East Kunlun.
- East Kunlun,
- Middle Triassic,
- Paleo-Tethyan,
- granitoid,
- petrogenesis,
- petrology

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References(64)

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Petrogenesis of Triassic Hongshuihe Granitoids in East Kunlun: Implications for the Paleo-Tethyan Orogeny

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