东昆仑哈日扎-那更康切尔银矿区花岗岩年代学、地球化学及岩石成因

马忠元; 柴佳兴; 张爱奎; 燕正君; 张金阳

doi:10.3799/dqkx.2022.418

Volume 49 Issue 5

May 2024

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Article Navigation > Earth Science > 2024 > 49(5): 1778-1792

Ma Zhongyuan, Chai Jiaxing, Zhang Aikui, Yan Zhengjun, Zhang Jinyang, 2024. Geochronology, Geochemistry and Petrogenesis of the Harizha-Nagengkangqieer Granites in the East Kunlun Orogen. Earth Science, 49(5): 1778-1792. doi: 10.3799/dqkx.2022.418

Citation:

Ma Zhongyuan, Chai Jiaxing, Zhang Aikui, Yan Zhengjun, Zhang Jinyang, 2024. Geochronology, Geochemistry and Petrogenesis of the Harizha-Nagengkangqieer Granites in the East Kunlun Orogen. Earth Science, 49(5): 1778-1792. doi: 10.3799/dqkx.2022.418

Citation:

Ma Zhongyuan, Chai Jiaxing, Zhang Aikui, Yan Zhengjun, Zhang Jinyang, 2024. Geochronology, Geochemistry and Petrogenesis of the Harizha-Nagengkangqieer Granites in the East Kunlun Orogen. Earth Science, 49(5): 1778-1792. doi: 10.3799/dqkx.2022.418

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Geochronology, Geochemistry and Petrogenesis of the Harizha-Nagengkangqieer Granites in the East Kunlun Orogen

doi: 10.3799/dqkx.2022.418

1.
The Third Geological Exploration Institute of Qinghai Province, Xining 810029, China
2.
School of Earth Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2022-11-03
Available Online: 2024-06-04
Publish Date: 2024-05-25

Abstract

Abstract

Several large silver deposits occur in the East Kunlun Orogen but their tectonic setting and related Paleo-Tethyan evolution are highly debated. Geochronological and geochemical works on the granites and porphyritic granites in the Harizha-Nagengkangqieer silver deposits of the East Kunlun Orogen were made in this study. LA-ICP-MS zircon U-Pb dating shows that the Harizha granites were emplaced at 255 Ma and the porphyritic granites in both areas between 220 Ma and 224 Ma. Late Permian Harizha granites have high SiO₂ and K₂O+Na₂O but low CaO and MgO contents with enriched light rare earth elements, depleted heavy rare earth elements and high field strength elements, negative Eu anomalies, high Ga/Al ratios and Zr+Nb+Ce+Y values, and thus are A-type. These rocks were generated by partial melting of crustal calc-alkaline Ⅰ-type granitoids in a back-arc extensional setting because of their relatively high K₂O/Na₂O, Ga/Al, FeO/MgO ratios. The Late Triassic calc-alkaline, peraluminous porphyritic granites are related to silver mineralization with similar major elements but low contents of trace elements compared to the Late Permian granites, are thus the result of fractional crystallization in a post-collisional background according to this and numerous previous data.
- East Kunlun,
- Harizha,
- Nagengkangqieer,
- granite,
- geochronology,
- geochemistry

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References(50)

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Geochronology, Geochemistry and Petrogenesis of the Harizha-Nagengkangqieer Granites in the East Kunlun Orogen

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