西藏打加错银(多金属)矿床含矿岩石成因及其找矿意义

陈浩; 郑有业; 余泽章; 林毅斌; 易建洲; 蒋宗洋; 田梦虎; 庞北

doi:10.3799/dqkx.2021.230

Volume 47 Issue 6

Jun. 2022

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Article Navigation > Earth Science > 2022 > 47(6): 2199-2218

Chen Hao, Zheng Youye, Yu Zezhang, Lin Yibin, Yi Jianzhou, Jiang Zongyang, Tian Menghu, Pang Bei, 2022. Petrogenesis and Prospecting Significance of Ore-Bearing Rocks in Dajiacuo Silver Polymetallic Deposit, Tibet. Earth Science, 47(6): 2199-2218. doi: 10.3799/dqkx.2021.230

Citation:

Chen Hao, Zheng Youye, Yu Zezhang, Lin Yibin, Yi Jianzhou, Jiang Zongyang, Tian Menghu, Pang Bei, 2022. Petrogenesis and Prospecting Significance of Ore-Bearing Rocks in Dajiacuo Silver Polymetallic Deposit, Tibet. Earth Science, 47(6): 2199-2218. doi: 10.3799/dqkx.2021.230

Citation:

Chen Hao, Zheng Youye, Yu Zezhang, Lin Yibin, Yi Jianzhou, Jiang Zongyang, Tian Menghu, Pang Bei, 2022. Petrogenesis and Prospecting Significance of Ore-Bearing Rocks in Dajiacuo Silver Polymetallic Deposit, Tibet. Earth Science, 47(6): 2199-2218. doi: 10.3799/dqkx.2021.230

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Petrogenesis and Prospecting Significance of Ore-Bearing Rocks in Dajiacuo Silver Polymetallic Deposit, Tibet

doi: 10.3799/dqkx.2021.230

Chen Hao^{1
,
,},
Zheng Youye^{1, 2
,
,},
Yu Zezhang³,
Lin Yibin⁴,
Yi Jianzhou⁵,
Jiang Zongyang⁵,
Tian Menghu¹,
Pang Bei¹

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 Xinhu Mining Company Limited, Lhasa 850000, China
4.
Tibet Julong Copper Company Limited, Lhasa 850000, China
5.
Land and Mineral Rights Exchange and Reserve Evaluation Center of Tibet Autonomous Region, Lhasa 850007, China

Received Date: 2021-09-28
Publish Date: 2022-06-25

Abstract

Abstract

Dajiacuo silver polymetallic deposit is the firstly and newly discovered deposit dominated by silver in the western Gangdese metallogenic belt. In order to find out the time of diagenesis and mineralization, genesis of ore-bearing rocks and metallogenic significance of the deposit, zircon U-Pb chronology, trace elements and Hf isotopes, whole rock geochemistry and molybdenite Re-Os chronology of the ore-bearing (sub-volcanic) volcanic rocks (rhyolitic crystal tuff and rhyolitic porphyry) exposed in the mine area are analyzed in this paper. The results show that the ore-bearing (sub-volcanic) volcanic rocks were formed at 66.6-67.4 Ma, and the late molybdenite isotopic Re-Os model age was 61.0±0.8 Ma. Combined with the mineralization characteristics of ore-bearing geological bodies and the interpenetration relationship between quartz-pyrite and molybdenite veins and ore-bearing rhyolite porphyry etc., it is confirmed that Dajiacuo has two stages of mineralization dominated by the high silicified (sub-volcanic) volcanic rock type and skarn type silver-polymetallic mineralization in the early stage and the quartz vein-type silver-polymetallic mineralization in the late stage. It has a metallogenic time limited of 66.6-61.0 Ma, forming the epithermal cryogenic metallogenic system related to the post-volcanic hydrothermal period. The geochemical data of the (sub-volcanic) volcanic rocks indicate that they belong to the high-K series to shoshonite series with metaluminous to peraluminous, enriched in LREE and large ion lithophile elements (K, Rb, Pb), and depleted in HREE and high field strength elements (Nb, Ta, Ti). The average temperature of zircon is 712 ℃, the ε_Hf(t) values are strongly negative (-16.5 to -3.6) and the T_DM^C is 1.2-2.1 Ga. The geochemical characteristics indicate that the ore-bearing rocks were typical S-type granite, which were generated from the partial melting of the Paleo-Mesoproterozoic Lhasa crystallization basement. Their characteristics are consistent with those of the ore-forming magmatic rock associated with the Ag-Pb-Zn deposits in the central Lhasa subterrane, but are obvious different with erupted Ⅰ-type granite related copper polymetallic mineralization in the south Lhasa subterrane. It is revealed that the south Lhasa subterrane has the same metallogenic potential as the central Lhasa subterrane related to S-type granites and has great theoretical and practical significance to enrich the mineralization types of the south Lhasa subterrane and promote the further exploration of this type deposits.
- prospecting significance,
- petrogenesis,
- magmatic oxygen fugacity and water content,
- silver polymetallic deposit,
- Dajiacuo,
- Gangdese,
- Tibet,
- petrology

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References(79)

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Petrogenesis and Prospecting Significance of Ore-Bearing Rocks in Dajiacuo Silver Polymetallic Deposit, Tibet

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