马达加斯加Maevatanana地区金矿床研究进展  

New Research Progress of Gold Deposit in Maevatanana Region,Madagascar

作　　者：杨喜安[1] 刘善宝[1] 李海松 李鹏[3] 陈毓川[4] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]山东正元地质勘查院,烟台264002 [3]中国地质大学,北京100083 [4]中国地质科学院,北京100037

出　　处：《地质科技情报》2013年第5期126-130,共5页Geological Science and Technology Information

基　　金：中国地质调查局项目"全球巨型成矿带区域构造与成矿地质背景对比研究"(1212011120326);中国博士后基金项目(2013M541000)

摘　　要：马达加斯加位于非洲东部。到目前为止,马达加斯加Maevatanana地区还没有进行工业化开采金矿床,主要靠手工采集砂金矿,估计马达加斯加每年的金产量3-4t。Maevatanana地区金矿床是典型的绿岩带中含金石英脉型金矿床,石英脉严格受断层控制。流体包裹体研究表明,成矿流体为低盐度水溶液流体和CO2 流体,并含有微量的CH4、H2S、N2,成矿流体的均一温度为250℃,压力约为130MPa。根据钻孔岩心化验结果可知,本地区的矿化类型主要为含金石英脉,其次为含金长英质脉。后期的含金石英脉切穿了早期的含金长英质脉,说明该地区具有2期成矿作用。Madagascar is situated in the eastern Africa. Up to now, there is no organised industrial gold exploitation in Maevatanana region. It is a large amount considering that it is presently mainly from artisanal mining of alluvial deposits. The region＇s estimated gold production is approximately 3--4 tonnes/year. The Au deposit in the Maevatanana region is a classical quartz vein type gold deposit in the greenstone belt, and the quartz veins was strictly controlled by faults. Fluid inclusion studies indicate homogeneous trapping of a low-salinity aqueous fluid coexisting with a carbonic fluid, and it may contain small amounts of CH4, H2S, N2. Fluid inclusion trapping average temperature is 250℃, and pressure is 1.3 kbar. According to the laboratory report of the drill core, it is demonstrated that the gold deposits in the Madagascar mainly comprise gold-bearing quartz veins, and the gold-bearing felsic veins is the subordinate. The late gold-bearing quartz veins crosscut the gold-bearing felsic veins, indicating that there are two epochs of mineralization in the study area.

关 键 词：马达加斯加 Maevatanana 金矿床 

分 类 号：P618.51[天文地球—矿床学]