摘要
文章报道了金属在高温高压气相的迁移实验研究，并阐明气相中迁移金属的成矿作用。实验是使含金属的流体在高温、高压的超临界态条件下通过相分离装置，在减低温度压力下实现气液相分离过程，收集气液相分离物，研究金属在气、液两相里的再分配。含金属（如金、铜）的NaHCO3-HCl-H2O流体在250～300℃的相分离过程实验结果表明：金属可以分布到气相里。根据金铜流体的实验结果，结合矿床调查，推测金属可以在地球深部以气体形式迁移。含金属的CO2-HCl-NaCl流体（气相）可以携带金属（金、铜），从岩石圈深部运输到地壳，甚至地表。金铜矿床矿石的形成过程中气体迁移金属起着重要作用。
Vapor-liquid phase separation experiments of metal-bearing supercritical fluids due to decreasing temperature or pressure indicate that metals can be redistributed in vapor and liquid phases in the sub-critical, vapor-liquid two-phase immiscibility region. Experiments show that Au and Cu-bearing NaHCO3-HCI-H2O hydrothermal fluids are separated into vapor phase and liquid phases respectively due to the reduction of pressure and temperature over the temperature range from 250℃ to 290℃ and at 22 MPa. The experiments indicate that Au（or Cu） appears in the vapor phase, experiences transportation by vapor phase and eventually reaches earth surface. This study provides vapor-liquid phase separation experimental results of Au and Cu-bearing fluids, and illustrates the Au and Cu ore geneses caused by vapor transportation of Au and Cu. This study proves that CO2-HCI-NaCI bearing aqueous fluids （in gas phase） may carry gold and copper and transport them from the deep part of the lithosphere to the surface.
出处
《矿床地质》
CAS
CSCD
北大核心
2006年第6期705-714,共10页
Mineral Deposits
基金
科技部(2003AA612020-3
G1999CB403212
2003DEA2C021)
国家自然科学基金(40043011
20373064)
国土资源部项目(20010302
200010200172)
大洋项目(DY105-03-01)资助
关键词
地球化学
含金属流体
气体内迁移金属
相分离实验
矿石成因
亚临界区
geochemistry, metal-bearing fluids, metal transported by vapors, phase separation, ore genesis, sub-critical region
