西藏次玛班硕斑岩铜矿蚀变-矿化样式及找矿潜力

李家桢; 吴松; 林毅斌; 蒋宗洋; 易建洲; 蒋光武; 刘晓峰; 华康; 次琼; 赵亚云

doi:10.3799/dqkx.2021.229

Volume 47 Issue 6

Jun. 2022

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Article Navigation > Earth Science > 2022 > 47(6): 2219-2244

Li Jiazhen, Wu Song, Lin Yibin, Jiang Zongyang, Yi Jianzhou, Jiang Guangwu, Liu Xiaofeng, Hua Kang, Ci Qiong, Zhao Yayun, 2022. Alteration-Mineralization Style and Prospecting Potential of Cimabanshuo Porphyry Copper Deposit in Tibet. Earth Science, 47(6): 2219-2244. doi: 10.3799/dqkx.2021.229

Citation:

Li Jiazhen, Wu Song, Lin Yibin, Jiang Zongyang, Yi Jianzhou, Jiang Guangwu, Liu Xiaofeng, Hua Kang, Ci Qiong, Zhao Yayun, 2022. Alteration-Mineralization Style and Prospecting Potential of Cimabanshuo Porphyry Copper Deposit in Tibet. Earth Science, 47(6): 2219-2244. doi: 10.3799/dqkx.2021.229

Citation:

Li Jiazhen, Wu Song, Lin Yibin, Jiang Zongyang, Yi Jianzhou, Jiang Guangwu, Liu Xiaofeng, Hua Kang, Ci Qiong, Zhao Yayun, 2022. Alteration-Mineralization Style and Prospecting Potential of Cimabanshuo Porphyry Copper Deposit in Tibet. Earth Science, 47(6): 2219-2244. doi: 10.3799/dqkx.2021.229

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Alteration-Mineralization Style and Prospecting Potential of Cimabanshuo Porphyry Copper Deposit in Tibet

doi: 10.3799/dqkx.2021.229

Li Jiazhen^{1
,
,},
Wu Song^{1, 2
,
,},
Lin Yibin³,
Jiang Zongyang⁴,
Yi Jianzhou⁴,
Jiang Guangwu³,
Liu Xiaofeng⁵,
Hua Kang⁵,
Ci Qiong⁵,
Zhao Yayun⁵

1.
School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, China
3.
Tibet Julong Copper Company Limited, Lhasa, 850000, China
4.
Land and Mineral Rights Trading and Resource and Reserve Evaluation Centre of Tibet Autonomous Region, Lhasa 850007, China
5.
No.2 Geological Team, Tibet Autonomous Region Geological Mining Exploration and Development Bureau, Lhasa 850000, China

Received Date: 2021-09-30
Publish Date: 2022-06-25

Abstract

Abstract

The Cimabanshuo is a newly discovered porphyry copper deposit in the western part of the Gangdese belt in Tibet. It is located about 10 km southwest of the super-large Zhunuo porphyry copper deposit, which is surrounded by the Beimulang, Luobugangmu, and Dongshibu deposits. These deposits are an important part of the Zhunuo copper ore-concentrated district. To further clarify the prospecting potential and exploration direction of the Cimarbanshuo, a systematic zircon U-Pb geochronology analysis and zircon trace element analysis, elaborate alteration-mineralization cataloging of the drilling, and detailed petrographic observations were carried out for the deposit. The study shows that the Miocene intrusions of the main ore-forming period of the Cimabanshuo copper deposit were a composite pluton, consisting of fine-grained monzonite granite porphyry (F porphyry: 16±0.30 Ma), coarse-grained monzonite porphyry (C porphyry: 15.89±0.06 Ma), hornblende monzonite granite porphyry (H porphyry: 15.81±0.06 Ma), diorite porphyry, and monzonitic granite (15.51±0.07 Ma). Different magmas contribute variously to mineralization. The ratios of zircon Ce⁴⁺/Ce³⁺ (average 190) and 10 000×(Eu/Eu^*)/Y (average 13) indicate that the oxygen fugacity and water content of the Miocene rocks in the Cimabanshuo are higher than those in the Zhunuo deposit. The hydrothermal evolution of the Cimabanshuo can be divided into 4 stages and 14 types of veins. According to the correspondence between alteration and mineralization at Cimabanshuo, it concludes that copper mainly precipitates in the K-silicate alteration stage, especially closely related to biotite alteration. Propylitic alteration also contributes to part of the copper and phyllic alteration stage contains the least amount of Cu. Compared with the classic alteration-mineralization zoning model of porphyry copper systems, the Cimabanshuo exhibits some abnormal characteristics, such as a strong superposition of deep K-silicate alteration by propylitic alteration and the low-temperature alteration was cutting by high-temperature veins, indicating that there are multiple stages of magma-hydrothermal processes, which provide a steady stream of thermodynamics, ore-forming materials, and ore-forming fluids for mineralization. The F porphyry is the main mineralizing intrusion, which is distributed in the northern part of the Cimabanshuo deposit.The alteration-mineralization in the north of the mining area is stronger than that in the south, and the deep development of strong propylitization alteration. In conclusion, it believes that the Cimabanshuo deposit also has great prospecting potential. The next step of the exploration should be the deeper levels and northeast direction of the mining area, focusing on the F porphyry, C porphyry, and the zones of K-silicate alteration.
- alteration-mineralization style,
- miocene composite pluton,
- porphyry copper deposit,
- Cimabanshuo,
- Tibet,
- petrology

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References(72)

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Alteration-Mineralization Style and Prospecting Potential of Cimabanshuo Porphyry Copper Deposit in Tibet

doi: 10.3799/dqkx.2021.229

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通讯作者: 陈斌, bchen63@163.com

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