| 李腊梅.西藏马攸木金矿富CO2 超临界流体特征及矿床成因探讨[J].地质与勘探,2009,45(5):502-508 |
| 西藏马攸木金矿富CO2 超临界流体特征及矿床成因探讨 |
| The Characteristics of CO2 -rich Supercritical Fluids and The GenesisDiscussion of Mayoum Gold Deposit,Tibet |
| 投稿时间：2009-04-30 修订日期：2009-07-01 |
| DOI： |
| 中文关键词: 马攸木金矿 富CO2 超临界流体 矿床成因 |
| 英文关键词: Mayoum gold deposit,CO2 -rich supercritical fluids,genesis of the deposit |
| 基金项目:“十一五冶国家科技支撑计划项目(编号:2006BAB01A04)资助。 |
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| 中文摘要: |
| [摘要]马攸木金矿床是产于西藏雅鲁藏布江缝合带西段重要的独立岩金矿床。本文通过显微
测温分析首次发现该矿床的富CO2 流体包裹体具有临界均一的特征,成矿流体属于超临界流体。研究
结果表明:成矿流体主要为低盐度的CO2 -H2 O 超临界流体。超临界流体可能是从岩浆出溶的,这种流
体萃取了围岩中的金等成矿元素。流体经历了相分离-不均一捕获-跨越临界点-大气降水加入的过
程,正是由于成矿流体在跨越临界点时析出部分成矿物质,形成早期矿化体;成矿后期流体与大气降水
混合最终导致矿质大量沉淀。 |
| 英文摘要: |
| Abstract:Mayoum Gold deposit is located in the western part of the Brahmaputra suture zone, Tibet, as an important independent rock gold deposit.
The present paper first found that the CO2 fluid inclusions have the characteristics of the critical uniform by temperature test. The ore-forming fluids are
supercritical fluids。The results show that the ore-forming fluids are low salinity supercritical CO2 -H2 O fluids. Supercritical fluids may exsolute from the
magma, and then extract the elements such as gold from the rock. Fluids experienced phase separation, heterogeneity capture, across the critical point,
precipitation adding processes. Ore-forming fluids across the critical point precipitate ore-forming elements, and form the early mineralization body. Flu鄄
ids mix with the precipitation eventually, which lead to mass ore precipitation during the late ore forming stage. |
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