摘要
地下水直接成矿类型金矿化系指在近地表活动的含矿地下水在下渗过程中由于物化条件的改变而直接导致的成矿。桂东大瑶山隆起区该类金矿化具有分布广、规模小、产出浅、矿化集中、受负地形的控制、为上富下贫的无根矿化等特征 ;地层较高的含金性、长期隆起接受风化剥蚀、多期次的断裂构造活动、亚热带温湿多雨的气候环境及特殊的地形位置为成矿创造了条件 ;金的活化迁移与地下水中富含腐植酸和菌藻类微生物等有机物质关系密切 ;富集成矿与含矿地下水下渗过程中氧逸度降低、pH值升高、有机碳吸附和还原作用、菌藻类微生物和腐植酸等有机物质作用等因素有关。成矿具有长期性 ,是一种发生于近地表常温下的内生成矿 ,加强该类矿化的研究 ,对丰富金矿成矿理论和指导找矿都有一定意义。
The gold mineralizations in permeating underground water near the earth's surface are widely distributed in Dayao mountain upwarped district, eastern Guangxi. Their mineralizing characteristics are of small dimension, shallow occurrence, high concentration and unrooted mineralization. The mineralizations are controlled by gold contents in strata, weathering intensity of rocks, structural activities, underground water activities and properties, climate environment and topographic conditions, etc. The activation and transference of gold in the undergraound water is related to the action of algal and enriching humic acid in the water. The concentration and mineralization of gold is probably related to the dropping of fo 2, rising of pH, absorption and reduction of organic carbon, the action of algal and enriching humic acid in the water. It is very significant for studying the gold mineralization.
出处
《桂林工学院学报》
2000年第3期220-224,共5页
Journal of Guilin University of Technology
基金
国家黄金局科研项目!(编号 91- 93- 19)部分成果
关键词
地下水直接成矿
金矿
矿化特征
成矿条件
permeating underground water mineratizatiion
gold mineralization
mineralizing characteristics
mineral formation condition
significance
Guangxi
Dayao mountain upwarped district
