基于红外反射光谱技术的苏里南Saramacca金矿床围岩蚀变特征研究  

Alteration characteristics of Saramacca gold deposit in Suriname based on infrared spectroscopy technology

作　　者：赵路通 林亮华 ZHAO Lutong;LIN Lianghua(Sino-Zijin Resources Ltd,Zijin Mining,Beijing 100012,China;Rosebel Gold Mines N.V.Paramaribo box2973,Suriname)

机构地区：[1]中色紫金地质勘查(北京)有限责任公司,北京100012 [2]苏里南罗斯贝尔金矿有限公司,帕拉马里博Box2973

出　　处：《矿产勘查》2024年第S2期459-466,共8页Mineral Exploration

基　　金：紫金矿业集团科技立项项目矿山综合找矿预测专项(4104KY2022030001)资助。

摘　　要：Saramacca金矿床是圭亚那地盾北部Marowijine绿岩带中首次发现的产于变质火山岩中,受构造破碎带控制的大型造山型金矿床。矿区围岩蚀变类型主要为云母化、绿泥石化、硅化、黄铁矿化和碳酸盐化。短波红外光谱分析仪对绿泥石、碳酸盐和云母矿物成分分析结果显示矿区由远矿端至近矿端铁发育镁绿泥石-方解石-多硅白云母组合→铁镁绿泥石-方解石/白云石-白云母组合→铁绿泥石-铁白云石/菱铁矿-钠云母组合的分带特征,其中铁绿泥石-铁白云石/菱铁矿-钠云母组合与矿化关系最为密切,可作为有效的找矿标志。Saramacca gold deposit is the first large-scale orogenic gold deposit discovered in Marowijine greenstone belt in northern Guyana Shield,which is produced in metamorphic volcanic rocks and controlled by structural fracture zone.The main types of wall rock alteration in the mining area are micaization,chloritization,silicification,pyritization and carbonation.The results of measuring the mineral composition of chlorite,carbonate and mica by short wavelength infrared analyzer show that the zoning characteristics of magnesium chlorite-calcite-polysilicate muscovite combination→iron magnesium chlorite-calcite/dolomite-muscovite combination→iron chlorite-ankerite/siderite-paragonite combination are developed from the distal to proximal in the mining area,in which the iron chlorite-ankerite/siderite-paragonite combination has the closest relationship with mineralization,and can be used as an effective prospecting indicator.

关 键 词：Saramacca矿床 造山型金矿 围岩蚀变 蚀变矿物 红外反射光谱 

分 类 号：P548[天文地球—构造地质学]