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| Characteristics and evolution of ore-forming fluids of the Chongjiang copper deposit in the Gangdise porphyry copper belt, Tibet | |
| 作者姓名： | Yuling Xie Jiuhua Xu Guangming Li Zhiming Yang Longsheng Yi |
| 作者单位： | [1]Civil and Environmental Engineering School, University of Science and Technology Beijing, Beijing 100083, China [2]Chengdu Institute of Geology and Mineral Resource, Ministry of Land and Resource, Chengdu 610082, China [3]Institute of Mineral Resources, China Academy of Geological Science, Beijing 100037, China |
| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划) |
| 摘 要： | Petrography, microthermometry, and scanning electron microscope/energy dispersive spectrometer （SEM/EDS） studies were performed on the fluid inclusions in the ore-beating quartz veins and quartz phenocrysts in the porphyry of the Chongjiang porphyry copper deposit. The analyses of the fluid inclusions indicate that the ore-forming fluids were exsolved from magma. They are near-saturated, supercritical, rich in volatile constituents, and have the capture temperature of 362-389℃ and salinities of 17.7wt%- 18.9wt% NaC1 eq. With the decreasing of temperature and pressure, the supercritical fluids were separated into a low salinity vapor phase and a high salinity liquid phase. During quartz-sericitization, the high salinity fluid boiled and separated into a low salinity vapor phase and a high salinity liquid phase. The high salinity inclusions that formed in the boiling process had daughter mineral melting temperatures higher than the homogenization temperatures of the vapor and liquid phases. The late fluids that are responsible for argillization are of lower temperature and salinity. |
| 关 键 词： | 西藏 冲江铜矿 冈底斯斑岩铜矿带 成矿流体 特性 演化 |
| 收稿时间： | 2006-05-22 |
Characteristics and evolution of ore-forming fluids of the Chongjiang copper deposit in the Gangdise porphyry copper belt, Tibet |
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| Yuling Xie Jiuhua Xu Guangming Li Zhiming Yang Longsheng Yi.Characteristics and evolution of ore-forming fluids of the Chongjiang copper deposit in the Gangdise porphyry copper belt, Tibet[J].Journal of University of Science and Technology Beijing,2007,14(2):97-102. | |
| Authors: | Yuling Xie Jiuhua Xu Guangming Li Zhiming Yang Longsheng Yi |
| Affiliation: | 1. Civil and Environmental Engineering School, University of Science and Technology Beijing, Beijing 100083, China 2. Chengdu Institute of Geology and Mineral Resource, Ministry of Land and Resource, Chengdu 610082, China 3. Institute of Mineral Resources, China Academy of Geological Science, Beijing 100037, China |
| Abstract: | Petrography, microthermometry, and scanning electron microscope/energy dispersive spectrometer (SEM/EDS) studies were performed on the fluid inclusions in the ore-bearing quartz veins and quartz phenocrysts in the porphyry of the Chongjiang porphyry copper deposit. The analyses of the fluid inclusions indicate that the ore-forming fluids were exsolved from magma. They are near-saturated, supercritical, rich in volatile constituents, and have the capture temperature of 362-389°C and salinities of 17.7wt%-18.9wt% NaCl eq. With the decreasing of temperature and pressure, the supercritical fluids were separated into a low salinity vapor phase and a high salinity liquid phase. During quartz-sericitization, the high salinity fluid boiled and separated into a low salinity vapor phase and a high salinity liquid phase. The high salinity inclusions that formed in the boiling process had daughter mineral melting temperatures higher than the homogenization temperatures of the vapor and liquid phases. The late fluids that are responsible for argillization are of lower temperature and salinity. |
| Keywords: | Gangdise porphyry copper belt Chongjiang copper deposit fluid inclusions ore-forming fluids |
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