|Table of Contents|

Characteristics of Ore-forming Fluids and Genesis of Kuru'er Cu-Au Deposit in West Tianshan, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2019年第06期
Page:
691-706
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Characteristics of Ore-forming Fluids and Genesis of Kuru'er Cu-Au Deposit in West Tianshan, China
Author(s):
ZHAO Kai-pei1 GU Xue-xiang12* ZHANG Yong-mei12 PENG Yi-wei34 WANG Guan-nan5 HE Yu1 GUO Jian-ping6
(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. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059,Sichuan, China; 4. State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210046,Jiangsu, China; 5. Aluminum Corporation of China Limited, Beijing 100082, China; 6. No.703 Geological Team, Xinjiang Nonferrous Geoexploration Bureau, Yining 835000, Xinjiang, China)
Keywords:
fluid inclusion ore-forming fluid fluid immiscibility genesis of deposit subepithermal deposit Cu-Au deposit West Tianshan Xinjiang
PACS:
P611; P618.2
DOI:
-
Abstract:
Kuru'er Cu-Au deposit is located in Late Paleozoic Yishijilike rift belt of West Tianshan, Xinjiang. The host rock is andesite lithic tuff of Lower Carboniferous Dahalajunshan Formation, and the occurrence of orebodies is controlled by a series of fault structures. Insufficient research on the characteristics of ore-forming fluids limits the understanding of the genesis of Kuru'er Cu-Au deposit. Based on the geological characteristics and fluid inclusions, the properties, sources and evolution of ore-forming fluids were discussed, and the genetic types of deposit were initially identified. The hydrothermal mineralization process of Kuru'er Cu-Au deposit can be divided into quartz-chalcopyrite-pyrite-gold stage, quartz-chalcopyrite stage and quartz-chlorite/epidote-calcite stage. The fluid inclusion shows that the main metallogenic stage(quartz-chalcopyrite-pyrite-gold stage)is mainly composed of gas-liquid-water two-phase inclusions, containing a small amount of CO2-H2O three-phase inclusions and stone salt crystal multiphase inclusions, and the homogenization temperatures are 184 ℃-359 ℃, 250 ℃-319 ℃ and 229 ℃-263 ℃ with the salinities of 4.1%-8.5% NaCleq, 1.0%-6.0% NaCleq and 32.7%-33.9% NaCleq; quartz-chalcopyrite stage and quartz-chlorite/epidote-calcite stage are both gas-liquid-water two-phase inclusions, and the homogenization temperatures are 144 ℃-212 ℃ and 114 ℃-163 ℃, respectively, and the salinities are 0.2%-6.7% NaCleq and 0.1%-3.1% NaCleq. The initial ore-forming fluid of Kuru'er Cu-Au deposit has the characteristics of magmatic water with medium-high temperature, and medium-low and high salinities. The fluid immiscibility is the main mechanism for Au-Cu enrichment and mineralization. The genetic type of deposit belongs to the subepithermal deposit associated with the porphyry metallogenic system.

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