东昆仑那更康切尔银多金属矿床流纹斑岩锆石U-Pb年代学、地球化学特征及其地质意义

国显正; 谢万洪; 周洪兵; 田承盛; 李金超; 孔会磊; 杨涛; 姚学钢; 贾群子

doi:10.3799/dqkx.2018.101

Volume 44 Issue 7

Jul. 2019

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Article Navigation > Earth Science > 2019 > 44(7): 2505-2518

Guo Xianzheng, Xie Wanhong, Zhou Hongbing, Tian Chengsheng, Li Jinchao, Kong Huilei, Yang Tao, Yao Xuegang, Jia Qunzi, 2019. Zircon U-Pb Chronology and Geochemistry of the Rhyolite Porphyry in the Nagengkangqieer Silver Polymetallic Deposit, East Kunlun and Their Geological Significance. Earth Science, 44(7): 2505-2518. doi: 10.3799/dqkx.2018.101

Citation:

Guo Xianzheng, Xie Wanhong, Zhou Hongbing, Tian Chengsheng, Li Jinchao, Kong Huilei, Yang Tao, Yao Xuegang, Jia Qunzi, 2019. Zircon U-Pb Chronology and Geochemistry of the Rhyolite Porphyry in the Nagengkangqieer Silver Polymetallic Deposit, East Kunlun and Their Geological Significance. Earth Science, 44(7): 2505-2518. doi: 10.3799/dqkx.2018.101

Citation:

Guo Xianzheng, Xie Wanhong, Zhou Hongbing, Tian Chengsheng, Li Jinchao, Kong Huilei, Yang Tao, Yao Xuegang, Jia Qunzi, 2019. Zircon U-Pb Chronology and Geochemistry of the Rhyolite Porphyry in the Nagengkangqieer Silver Polymetallic Deposit, East Kunlun and Their Geological Significance. Earth Science, 44(7): 2505-2518. doi: 10.3799/dqkx.2018.101

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Zircon U-Pb Chronology and Geochemistry of the Rhyolite Porphyry in the Nagengkangqieer Silver Polymetallic Deposit, East Kunlun and Their Geological Significance

doi: 10.3799/dqkx.2018.101

1.
Geological Survey of China University of Geosciences, Wuhan 430074, China
2.
Xi'an Center, China Geological Survey, Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposit, MNR, Northwest China Center for Geoscience Innovation, Xi'an 710054, China
3.
Metallurgical Geological Prospecting Bureau of Sichuan Province, Chengdu 611730, China
4.
Geological Survey Bureau of Qinghai Province, Xining 810012, China

Received Date: 2018-06-07
Publish Date: 2019-07-15

Abstract

Abstract

The Nagengkangqieer silver polymetallic deposit located in the East Kunlun orogenic belt is a newly discovered large-scale silver deposit in Qinghai Province. Orebodies of the deposit are mainly hosted in rhyolite porphyry. This paper presents zircon U-Pb dating and Lu-Hf isotopes, whole-rock major and trace elements for rhyolite porphyry in the Nagengkangqieer deposit. The LA-ICP-MS zircon U-Pb analyses for rhyolite porphyry show that rocks formed during the Late Triassic with ages of 217.4±3.1 Ma. The rhyolite porphyry has high contents of SiO₂ (73.08%-75.78%), Al₂O₃ (14.05%-16.04%), with K₂O+Na₂O ranging from 4.31% to 4.77%, and K₂O=4.20%-4.61%, belonging to the high-potassium calc-alkaline strong peralkaline volcanic rocks. These rocks are characterized by high silicon, aluminum and high-potassium, the Mg^# values range from 45 to 54; and rhyolite porphyry is depleted in high field strength elements (HFSEs; e.g., Nb, Ta, P, and Ti), and enriched in large-ion lithophile elements (LILEs; e.g., Rb, Th and K); ε_Hf(t) values vary from -4.4 to -9.7, and the two-stage model age of T_DM2 ranges from 1 533 Ma to 1 864 Ma. According to the petrology, geochemistry and regional tectonic background, we conclude that the rhyolite porphyry was predominantly derived from partial melting of the Paleoproterozoic-Mesoproterozoic continental crust and some mantle derived material, it formed in extension tectonic settings. The Nagengkangqieer silver polymetallic deposit reflects the Late Triassic mineralization, which is essential for future exploration of polymetallic deposit in the area where intrusive rocks or volcanic rocks in East Kunlun orogenic belt would be very obvious.
- rhyolite porphyry,
- zircon U-Pb dating,
- geochemistry,
- Nagengkangqieer silver polymetallic deposit,
- East Kunlun

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References(72)

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沈阳化工大学材料科学与工程学院沈阳 110142

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Zircon U-Pb Chronology and Geochemistry of the Rhyolite Porphyry in the Nagengkangqieer Silver Polymetallic Deposit, East Kunlun and Their Geological Significance

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