摘要
对煤中金的国内外研究现状进行了综述,详细讨论了煤中金的分布规律、赋存状态与富集成因。世界范围内绝大多数煤中金的丰度较低,只有局部煤中金的含量异常,特别是在周围有金矿点或富金岩层的煤层中才有富金可能。含有较多金矿点的黔西南区煤中金的平均含量要明显高于黔北煤,具有成矿潜力。低温热液成因的硫化物(主要是黄铁矿)、石英和方解石脉可能是金的主要载体,腐植酸与黏土矿物的吸附也是煤中金的重要赋存方式。对任一金矿床来说,可能由多种地质因素引起金的富集沉淀,其中有机质、低温热液作用、纳米金的气相迁移以及矿物表面特性可能是煤中金富集的主要因素。
Current studies on gold in coal in world were introduced, and the distribution, occurrence and accumulation causes of gold in coal were discussed in detail. Gold has a lower abundance in most coals throughout the world. Howev- er, anomalous gold content was found in some coals, particularly in the coal seams framed by gold mines or Au-special- ized rocks and these seams were regarded as the most promising for gold accumulation. Gold has an obviously higher content in coals from Southwestern Guizhou Province containing many gold deposits than in coals from the North,pos- sessing an ore-forming potential. Sulfide （ mainly pyrite ）, quartz and carbonate veins affected by low-temperature hydrotherIn should be the main carriers of gold in coal. Additionally, gold is absorbed by humic acid and clay miner- als, which are also important modes of occurrence of gold in coal. For any gold deposit, there exist many geological fac- tors resulting in the gold accumulation, of which the organic matter, the low-temperature hydrothermal process, the mi- gration of nano-gold in gas phases and the surface behaviour of minerals are likely to be the most effective factors for gold accumulation in coal.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2010年第2期236-240,共5页
Journal of China Coal Society
基金
国家自然科学基金资助项目(40772102
40730422)
新世纪优秀人才支持计划资助项目(NCET-08-0839)
关键词
煤
金
地球化学
丰度
coal
gold
geochemistry
abundance
