江西万年银金矿床Ⅶ号脉原生晕特征与深部预测  

Characteristics of Primary Haloes of the Ⅶ Vein in the Wannian Silver-Gold Deposit, Jiangxi Province and Deep Orebody Prediction

作　　者：吴建亮[1] 吕新彪[1] 杨梧[1] 杨永胜[1] 高荣臻[1] 刘洪[2] 王于键[1] 

机构地区：[1]中国地质大学,湖北武汉430074 [2]中国地质调查局成都地质调查中心,四川成都610081

出　　处：《地质与勘探》2013年第5期836-845,共10页Geology and Exploration

基　　金：万年矿业有限公司"江西万年县虎家尖银;金矿区深部及外围找矿综合研究及成矿预测"资助

摘　　要：文中主要对江西万年银金矿床Ⅶ号脉原生晕特征作了系统论述。因子分析结果表明,F1因子代表成矿期石英-多金属硫化物阶段银矿化,F2因子代表细粒硫化物阶段的银、金矿化,反映出该矿区具有一期金矿化,两期银矿化特点。矿区Ⅶ号脉由南西向北东发育三个原生晕带,其中Ⅱ号原生晕带表现出明显的反分带特征,由浅到深其轴向分带序列为Sn-Au-Cu-Mn-B-Mo-Ni-F-Ag-Cr-Hg-Pb-Zn-W-Bi,其尾部出现前尾晕共存,地球化学参数呈"降-升-降-升"振荡波动变化,均反映其深部有盲矿体的存在。对矿化规律研究表明,Ⅶ号矿体赋存于Ⅶ号构造破碎带内,并被其严格限制,厚矿体多呈不规则瘤状以雁列式近等距排布,往NE向深部侧伏延伸,侧伏角约45°～55°之间,厚矿体中心间距离大约在180～220m之间。厚矿体以及Ag、Au品位与厚度乘积的高值区在矿区中部46～56线区段-235m深部以下均有明显延伸,为有利的构造及成矿指示标志。在此基础上建立了矿区深部矿体预测立体模型,为矿区深部地质工作部署提供有效依据。This paper describes the geochemical characteristics of primary haloes of the VII vein in the Wannian silver-gold deposit, Jiangxi Province. The factor analysis results show that F1 stands for Ag mineralization in the quartz-multimetal sulfide stage, F2 stands for Ag and Au mineralization in the fine particles sulfide stage, which reflects this deposit has a feature of one period of Au mineralization and two periods of Ag mineralization. The Vii vein hosts 3 primary halo belts from the southwest to the northeast. The 2nd primary halo belt exhibits an obvious unusual zoning sequence （ from high to low） ： Sn - Au - Cu - Mn - B - Mo - Ni - F - Ag - Cr - Hg - Pb - Zn - W - Bi, where the trail halo and the front halo arc superimposed in its end part. Geo- chemical parameters with a variation of ＂down-up-down-up＂ also indicate the existence of deep orebodies underneath. Metallogeny shows the VII ore body occurs in the VII structural fracture belt and is strictly controlled by it . The lateral extension of the thick orebody to the deep part is in NE direction in a form of en echelon. The thick orebody and the higher product of Ag - Au grade and the thickness of ore body both have an evident extension in the area blow the -235 m level between the 46th -56th exploration lines as favorable prospecting indicators. Based on these data, a three-dimensional deep ore- body prediction model is established to provide evidence for the further exploration work.

关 键 词：深部预测 原生晕 万年银金矿 江西 

分 类 号：P612[天文地球—矿床学]