陕西凤县温江寺锑—金矿床地质特征

秦岭造山带三叠系中的微细浸染型金矿多年来未得到突破,陕西凤县温江寺金矿的发现给本区微细浸染型金矿找矿带来契机,研究区该金矿带已控制长约10 km,温江寺金矿赋存在下三叠统任家沟组粉砂细砂岩—粉砂质泥板岩—碳质泥板岩—碳质泥灰岩—薄层灰岩薄互层中,沉积成岩黄铁矿莓球含As 0.5%。早燕山期斑状斜长花岗岩脉顺层侵入该含矿沉积层中,为成矿带入Mo-Bi-Te相关组分。晚期递进性韧—脆性剪切带的改造,容矿沉积岩在多期、多阶段活动下表现为片理化(近EW向)和破碎控矿构造带(近EW-NE向交会),构造带中花岗岩脉形成蚀变岩石,产生的含矿热液形成扁豆体—透镜体状及脉状矿体,就位于控矿韧—脆性构造带中。热液成矿具有多期、多阶段作用特征,矿化具有自形、半自形微细浸染结构构造特征,载金矿物为含砷黄铁矿、毒砂和硅化石英,含少量辉锑矿,显示Au-As-Hg-Sb地球化学组合特征。

The Geological Feature of Antimony-Gold Deposit in Wenjiangsi Area,Shaanxi Province

The micro-disseminated gold deposit of Triassic of Qinling orogenic belt has not breakthrough,the discovery of Wenjiangsi gold deposit bring opportunity for this area,the gold belt of study area has been controlled in 10 km,Wenjiangsi gold deposit occurrence in the Low-Triassic slity fine sand-slity shale-carbonaceous shalecarbonaceous marl-limestone thin layer,diagenesis pyrite berry ball contains 0.5% As.Early Mesozonic plagioclase porphyritic granite veins bedding invasion the ore-bearing sediments,and bring the Mo-Bi-Te related components for mineralization.Late progression of ductile-brittle shear zone transformation,the sedimentary ore show schistosity and broken ore belt in the multi-phase and multi-stage activities.The granite veins of tectonic belt form altered rocks,ore-forming hydrothermal form lentils-lens and vein shaped ore body,and it is located in the ductile-brittle tectonic belt.Hydrothermal mineralization has multi-period and multi-stage functional features,mineralization has the features of euhedral-subhedral tiny-dip texture and structure,gold mineral is the pyrite,arsenopyrite and silicified quartz,containing a small amount of stibnite,showing Au-As-Hg-Sb geochemical assemblages.