东昆仑迈龙金矿区花岗质岩浆岩锆石U-Pb定年和地球化学特征及其地质意义

于小亮; 李华; 魏小林; 张晖青; 李杰; 谷超; 童海奎; 陈华勇; 肖兵; 汪浩; 张斌顺

doi:10.3799/dqkx.2025.046

Volume 50 Issue 6

Jun. 2025

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Article Navigation > Earth Science > 2025 > 50(6): 2107-2123

Yu Xiaoliang, Li Hua, Wei Xiaolin, Zhang Huiqing, Li Jie, Gu Chao, Tong Haikui, Chen Huayong, Xiao Bing, Wang Hao, Zhang Binshun, 2025. Zircon U-Pb Age and Geochemical Characteristics of Granitic Magmatic Rocks in Mailong Gold Deposit, East Kunlun, and Their Geological Significance. Earth Science, 50(6): 2107-2123. doi: 10.3799/dqkx.2025.046

Citation:

Yu Xiaoliang, Li Hua, Wei Xiaolin, Zhang Huiqing, Li Jie, Gu Chao, Tong Haikui, Chen Huayong, Xiao Bing, Wang Hao, Zhang Binshun, 2025. Zircon U-Pb Age and Geochemical Characteristics of Granitic Magmatic Rocks in Mailong Gold Deposit, East Kunlun, and Their Geological Significance. Earth Science, 50(6): 2107-2123. doi: 10.3799/dqkx.2025.046

Citation:

Yu Xiaoliang, Li Hua, Wei Xiaolin, Zhang Huiqing, Li Jie, Gu Chao, Tong Haikui, Chen Huayong, Xiao Bing, Wang Hao, Zhang Binshun, 2025. Zircon U-Pb Age and Geochemical Characteristics of Granitic Magmatic Rocks in Mailong Gold Deposit, East Kunlun, and Their Geological Significance. Earth Science, 50(6): 2107-2123. doi: 10.3799/dqkx.2025.046

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Zircon U-Pb Age and Geochemical Characteristics of Granitic Magmatic Rocks in Mailong Gold Deposit, East Kunlun, and Their Geological Significance

doi: 10.3799/dqkx.2025.046

Yu Xiaoliang^{1, 2, 3
,
,},
Li Hua³,
Wei Xiaolin³,
Zhang Huiqing³,
Li Jie³,
Gu Chao³,
Tong Haikui³,
Chen Huayong⁴,
Xiao Bing^{4
,
,},
Wang Hao⁴,
Zhang Binshun⁵

1.
Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Qinghai Provincial Geological Survey Bureau, Technology Innovation Center for Exploration and Exploitation of Strategic Mineral Resources in Plateau Desert Region, Ministry of Natural Resources, Xining 810001, China
4.
CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
5.
Qinghai Province The Third Geological Exploration Institute of Nonferrous Metals, Xining 810000, China

Received Date: 2024-05-22
Publish Date: 2025-06-25

Abstract

Abstract

To reveal the tectonic evolution of the Proto-Tethys and Paleo-Tethys Oceans and their genetic links to gold-polymetallic mineralization in the East Kunlun orogenic belt (EKOB), this study conducted petrographic, geochemical, and LA-ICP-MS zircon U-Pb geochronological analyses on monzogranite and granodiorite from the Mailong gold deposit. The results show that the monzogranite and granodiorite crystallized at 421±11 Ma (Late Silurian) and 228±4 Ma (Late Triassic), respectively, exhibiting metaluminous, high-potassium calc-alkaline characteristics. Trace element analyses reveal enrichment in light rare earth elements (LREE), large-ion lithophile elements (LILE: Rb, K), and incompatible elements (U, Th, Pb), with depletion in high-field-strength elements (HFSE: Nb, Ta, P, Ti) and weak negative Eu anomalies, indicating an island arc granite affinity. Combined with regional geological evidence, these rocks formed through crust-mantle interaction during the post-orogenic extensional stage. The Mailong gold deposit, primarily hosted in the granodiorite, is likely associated with tectonic-magmatic activities during the post-orogenic extension of the Paleo-Tethys evolution. This study provides critical age constraints and geochemical insights into the tectonic evolution and gold mineralization in the EKOB, offering valuable guidance for regional mineral exploration.
- East Kunlun orogenic belt,
- U-Pb dating,
- geochemistry,
- monzogranite,
- granodiorite,
- petrology

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Zircon U-Pb Age and Geochemical Characteristics of Granitic Magmatic Rocks in Mailong Gold Deposit, East Kunlun, and Their Geological Significance

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