攀西裂谷南段水口菁碱性杂岩体磷灰石U⁃Pb年代学和地球化学特征

赵鹏鹏; 应元灿; 余海军; 李文昌; 蒋少涌

doi:10.3799/dqkx.2025.050

Volume 50 Issue 8

Aug. 2025

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Article Navigation > Earth Science > 2025 > 50(8): 2977-2992

Zhao Pengpeng, Ying Yuancan, Yu Haijun, Li Wenchang, Jiang Shaoyong, 2025. U⁃Pb Geochronology and Geochemical Characteristics of the Apatite from the Shuikoujing Alkaline Complex in the Southern Panxi Rift. Earth Science, 50(8): 2977-2992. doi: 10.3799/dqkx.2025.050

Citation:

Zhao Pengpeng, Ying Yuancan, Yu Haijun, Li Wenchang, Jiang Shaoyong, 2025. U⁃Pb Geochronology and Geochemical Characteristics of the Apatite from the Shuikoujing Alkaline Complex in the Southern Panxi Rift. Earth Science, 50(8): 2977-2992. doi: 10.3799/dqkx.2025.050

Citation:

Zhao Pengpeng, Ying Yuancan, Yu Haijun, Li Wenchang, Jiang Shaoyong, 2025. U⁃Pb Geochronology and Geochemical Characteristics of the Apatite from the Shuikoujing Alkaline Complex in the Southern Panxi Rift. Earth Science, 50(8): 2977-2992. doi: 10.3799/dqkx.2025.050

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U⁃Pb Geochronology and Geochemical Characteristics of the Apatite from the Shuikoujing Alkaline Complex in the Southern Panxi Rift

doi: 10.3799/dqkx.2025.050

Zhao Pengpeng^{1
,
,},
Ying Yuancan^{1
,
,
,},
Yu Haijun^{1, 2, 3},
Li Wenchang¹,
Jiang Shaoyong⁴

1.
Faculty of Land and Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China
2.
Institute of Yunnan Geology Survey, Kunming 650051, China
3.
Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization, Ministry of Natural and Resources, Kunming 650051, China
4.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2025-01-23
Publish Date: 2025-08-25

Abstract

Abstract

The Shuikoujing alkaline complex, the largest basic⁃ultrabasic complex exposed in the southern Panxi Rift.Previous studies suggest that the complex is closely related to the Late Permian Emeishan Large Igneous Province (ELIP) magmatic activity, but precise geochronological constraints have been lacking, which has hindered the understanding of the genesis, evolution, and tectono⁃dynamic background of the alkaline complex in the southern Panxirift.In this study, based on detailed petrographic and geochemical investigations, using LA⁃(MC)⁃ICP⁃MS analytical techniques to conduct U⁃Pb dating, trace element composition, and Sr isotopic analysis on apatite from various lithologies. These analyses aim to explore the genesis, evolution, and the associated tectono⁃dynamic background of the complex. The results show that the U⁃Pb ages of apatite from the gabbro and pyroxene diorite are 263±11 Ma and 262.8±6.4 Ma, The in situ Sr isotope composition of apatite is uniform (0.704 1~0.704 5) and exhibits typical mantle⁃derived characteristics. Suggesting that the formation of the primary magma is closely related to the activity of the ELIP, originating from low⁃degree partial melting of the lithospheric mantle in an intraplate extensional setting, and subsequently underwent rapid magmatic differentiation and evolution. Additionally, these alkaline complexes in the southern Panxi Rift are inferred to be products of the initial magmatic evolution of the ELIP.
- Shuikoujing,
- apatite,
- Panxi Rift,
- alkaline complex,
- geochemistry

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References(60)

References

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U⁃Pb Geochronology and Geochemical Characteristics of the Apatite from the Shuikoujing Alkaline Complex in the Southern Panxi Rift

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