北山成矿带金窝子金矿床成矿流体时空演化与成矿机制

王钏屹; 王琦崧; 疏孙平; 张静

doi:10.3799/dqkx.2018.134

Volume 43 Issue 9

Sep. 2018

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Article Navigation > Earth Science > 2018 > 43(9): 3126-3140

Wang Chuanyi, Wang Qisong, Shu Sunping, Zhang Jing, 2018. Temporal and Spatial Evolution of Ore-Forming Fluid and Metallogenic Mechanism in the Jinwozi Gold Deposit, Beishan Metallogenic Belt. Earth Science, 43(9): 3126-3140. doi: 10.3799/dqkx.2018.134

Citation:

Wang Chuanyi, Wang Qisong, Shu Sunping, Zhang Jing, 2018. Temporal and Spatial Evolution of Ore-Forming Fluid and Metallogenic Mechanism in the Jinwozi Gold Deposit, Beishan Metallogenic Belt. Earth Science, 43(9): 3126-3140. doi: 10.3799/dqkx.2018.134

Citation:

Wang Chuanyi, Wang Qisong, Shu Sunping, Zhang Jing, 2018. Temporal and Spatial Evolution of Ore-Forming Fluid and Metallogenic Mechanism in the Jinwozi Gold Deposit, Beishan Metallogenic Belt. Earth Science, 43(9): 3126-3140. doi: 10.3799/dqkx.2018.134

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Temporal and Spatial Evolution of Ore-Forming Fluid and Metallogenic Mechanism in the Jinwozi Gold Deposit, Beishan Metallogenic Belt

doi: 10.3799/dqkx.2018.134

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
2.
Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, Peking University, Beijing 100871, China

Received Date: 2018-03-24
Publish Date: 2018-09-15

Abstract

Abstract

The Jinwozi gold deposit is located in the central Beishan area, southern margin of the subduction-collision zone between the Late Paleozoic Tarim and Kazakhstan plates. The ore genesis of the Jinwozi gold deposit belongs to the orogenic type.However, the temporal and spatial evolution of ore-forming fluid and the metallogenic mechanism remain relatively unclear. The fluid inclusions in quartz from different mineralization stages and depths were analyzed by petrography, microscopic temperature measurement and laser Raman spectrum in this paper.The hydrothermal ore-forming process can be divided into three stages according to mineral assemblages and crosscutting relationships among the veins, from early to late, i.e., pyrite-quartz stage (early stage); quartz-pyrite-polymetallic sulfide stage (middle stage); quartz-carbonate stage (late stage). The gold mineralization mainly occurs in the middle stage.Two types of fluid inclusions are identified based on petrography and laser Raman spectroscopy:NaCl-H₂O inclusions (W-type) and CO₂-H₂O-NaCl inclusions (C-type). Both of the two fluid inclusion types can be observed in the early stage and middle stage quartz; while only the W-type inclusions occur in the late stage.The homogenization temperatures of early stage fluid inclusions range from 200℃ and 300℃, with salinities of 1.4%-14.8% NaCleqv. The fluid inclusions of middle stage are homogenized between 160℃ and 260℃, with salinities of 0.4%-14.5% NaCleqv; and in late stage they are 120-180℃ and of 0.2%-7.6% NaCleqv, respectively.From early to late stage, the ore-forming fluid system evolved from a CO₂-H₂O-NaCl system to a NaCl-H₂O system, with the homogenization temperature and salinities decreasing gradually. The results show that the ore-forming fluid system has evolved from the mesothermal, medium-low salinity, CO₂-rich metamorphic water to the mesothermal-epithermal, low salinity and CO₂-poor meteoric water. From the shallow to deep of the orebody, the homogenization temperature and salinity firstly increase and then decrease, which might be caused by the multi-superposition of ore-forming fluids. The homogenization temperature and ore-forming depth increase gradually from southwest to northeast area at Jinwozi gold deposit, which indicates that the northeastern intrusion may be a heat source center. Therefore, it is prospected that there will be a good metallogenic potential in the northeastern mining area. The physicochemical and hydrogen-oxygen isotopic data of fluid inclusions show that fluid mixing might be the dominant mechanism of gold deposition.
- ore deposits,
- fluid inclusion,
- temporal and spatial evolution,
- Jinwozi gold deposit,
- Beishan orogen

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Temporal and Spatial Evolution of Ore-Forming Fluid and Metallogenic Mechanism in the Jinwozi Gold Deposit, Beishan Metallogenic Belt

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