北秦岭官坡地区稀有金属伟晶岩锡石年代学、岩石地球化学特征及地质意义

曾威; 孙丰月; 周红英; 王佳营; 李志丹; 陈军强; 毕君辉; 崔玉荣

doi:10.3799/dqkx.2021.233

Volume 48 Issue 8

Aug. 2023

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Article Navigation > Earth Science > 2023 > 48(8): 2851-2871

Zeng Wei, Sun Fengyue, Zhou Hongying, Wang Jiaying, Li Zhidan, Chen Junqiang, Bi Junhui, Cui Yurong, 2023. Cassiterite U-Pb Age, Geochemistry and Their Geological Significances of Rare Metal Pegmatites in Guanpo Area, North Qinling, China. Earth Science, 48(8): 2851-2871. doi: 10.3799/dqkx.2021.233

Citation:

Zeng Wei, Sun Fengyue, Zhou Hongying, Wang Jiaying, Li Zhidan, Chen Junqiang, Bi Junhui, Cui Yurong, 2023. Cassiterite U-Pb Age, Geochemistry and Their Geological Significances of Rare Metal Pegmatites in Guanpo Area, North Qinling, China. Earth Science, 48(8): 2851-2871. doi: 10.3799/dqkx.2021.233

Citation:

Zeng Wei, Sun Fengyue, Zhou Hongying, Wang Jiaying, Li Zhidan, Chen Junqiang, Bi Junhui, Cui Yurong, 2023. Cassiterite U-Pb Age, Geochemistry and Their Geological Significances of Rare Metal Pegmatites in Guanpo Area, North Qinling, China. Earth Science, 48(8): 2851-2871. doi: 10.3799/dqkx.2021.233

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Cassiterite U-Pb Age, Geochemistry and Their Geological Significances of Rare Metal Pegmatites in Guanpo Area, North Qinling, China

doi: 10.3799/dqkx.2021.233

Zeng Wei^{1, 2, 3
,
,},
Sun Fengyue^{1
,
,},
Zhou Hongying^{2, 3},
Wang Jiaying^{2, 3},
Li Zhidan^{2, 3},
Chen Junqiang^{2, 3},
Bi Junhui^{2, 3},
Cui Yurong^{2, 3}

1.
College of Earth Sciences, Jilin University, Changchun 130061, China
2.
Tianjin Center, China Geological Survey, Tianjin 300170, China
3.
North China Center of Geoscience Innovation, Tianjin 300170, China

Received Date: 2021-10-11
Publish Date: 2023-08-25

Abstract

Abstract

The Guanpo-Danfeng area in the North Qinling Belt is the most important pegmatite-type uranium metallogenic and an important pegmatite-type rare metal metallogenic region in China. However, the formation age and the genetic mechanism of the rare metal pegmatites in this area still remain unclear. This paper presents LA-MC-ICP-MS cassiterite U-Pb age, Hf isotopic and geochemical data of granitic pegmatites in the Guanpo area to determine the formation age, the petrogenesis and tectonic setting of the rare metal pegmatites. Cassiterite LA-MC-ICP-MS dating of Nanyangshan rare metal pegmatites yields concordant age of420±2 Ma, representing the the formation age of the end of the Silurian, which indicated North Qinling was in late or postorogenic tectonic setting.The pegmaties exhibit a restricted range of negative zircon ε_Hf(t) values of -7.0 to -7.8, with T_DM2 age of 2.45 to 2.52 Ga, suggesting that the magma dominantly derived from ancient crust. The pegmatites are characterized by high A/CNK (A/CNK > 1.1), with extremely low rare earth content (ΣREE=0.43×10^-6~23.14×10^-6) and widely variable La_N/Yb_N ratios(0.7~22.3) and δEu(0.09~1.84). The enrichment in large ion lithophile elements(Rb and K) and high field strength elements (Nb, Ta, P and Hf), depletion in Ba, Nd, Zr, and Ti, low Nb/Ta ratios (average 2.66) and tetrad effects of rare earth elements comprehensively indicated that the magma has experienced high degree crystallization differentiation. The isotopic and geochemical data confirm that the rare metal pegmatite in the Guanpo area formed from high degree crystallization differentiation of peraluminous granitic magma and the genetic connection between the pegmatites and Huichizi and Damaogou granites is absent.
- Cassiterite U-Pb dating,
- geochemistry,
- granitic pegmatite,
- rare metal,
- Guanpo,
- North Qinling

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