| 金铜在气相中的迁移实验及矿石的成因 |
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| 引用本文：张荣华，胡书敏，张雪彤.2006.Transportation of Au and Cu by vapor and related ore genesis[J].Mineral Deposits,25(6):705~714 |
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| 基金项目: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）和大洋项目（DY 105_03_01） |
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| 中文摘要: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。 |
| 中文关键词: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 |
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| Transportation of Au and Cu by vapor and related ore genesis |
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| Abstract:Vapor_liquid phase separation experiments of metal_bearing supercritical fluids due to decreasing temperature or pressure indicate that metals can be redistribu ted in vapor and liquid phases in the sub-critical, vapor_liquid two-phase immis cibility region. Experiments show that Au and Cu_bearing NaHCO3-HCl-H2O hydr othermal fluids are separated into vapor phase and liquid phases respectively du e to the reduction of pressure and temperature over the temperature range from 2 50℃ 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 reach es 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-HCl-Na Cl bearing aqueous fluids (in gas phase) may carry gold and copper and transport them from the deep part of the lithosphere to the surface. |
| keywords:geochemistry, metal_bearing fluids, metal transported by va pors, phase separation,ore genesis,sub_critical region |
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