冀北隆化小罗卜沟金银矿床特征及找矿意义  

Characteristics of the Xiaoluobugou Gold and Silver Deposit in Longhua County of Northern Hebei Province and the Prospecting Significance

作　　者：张贵宝 王利明 袁海波 张国维 刘树兴 李增熙 ZHANG Guibao;WANG Liming;YUAN Haibo;ZHANG Guowei;LIU Shuxing;LI Zengxi(Hebei Provincial Geological Survey Institute,Shijiazhuang,Hebei 050006;Hebei Geological Workers University,Shijiazhuang,Hebei 050000)

机构地区：[1]河北省地质调查院,河北石家庄050006 [2]河北地质职工大学,河北石家庄050000

出　　处：《地质与勘探》2020年第3期502-511,共10页Geology and Exploration

摘　　要：冀北隆化县小罗卜沟中型金银矿床的发现是该地区找矿的重大突破。勘查区位于1∶20万和1∶5万Au、Ag等多元素综合异常内,通过以钻探、硐探为主的探矿工程,基本查明了矿体赋存于早白垩世九佛堂组复成分角砾岩和义县组安山岩及安山质火山角砾岩的构造裂隙内。矿体受断裂带控制,与围岩界线明显,对围岩没有选择性,矿床属燕山期与岩体有关的浅成中低温热液矿床。矿区内共圈定17个矿体,矿体长28~788 m,斜深8~489 m,平均厚度0.80~3.96 m,Ag平均品位68.44×10^-6~447.50×10^-6,共生Au平均品位1.16×10^-6~6.25×10^-6;伴生Au平均品位0.20×10^-6~1.00×10^-6,伴生S平均品位2.34%~11.10%。主要矿体Ⅳ-1银资源储量达中型。矿区内及外围仍存在寻找多金属矿床的潜力。该矿床的发现对寻找同类矿床具有重要指示意义。The discovery of the medium-scale Xiaoluobugou gold and silver deposit in Longhua County of northern Hebei marks a major breakthrough of prospecting in this area.It is located in the 1 ∶200 000 and 1 ∶50 000 multi-elements( Au,Ag,etc.) comprehensive anomaly zones.Drilling and adit exploration has clarified that the ore bodies are hosted in structural cracks of breccia in Early Cretaceous Jiufotang Formation and andesite and andesite volcanic breccia of Yixian Formation.They are controlled by fault zones,with clear boundaries to country rocks without any selectivity.The deposit belongs to the Yanshanian epithermal deposit related to rock mass.There are 17 ore bodies delineated in the mine area,which are 28 ~ 788 m long,with oblique depth of 8 ~ 489 m,and average thickness of 0.80 ~ 3.96 m.On average,the grades are 68.44×10^-6~ 447.50×10^-6 for Ag,1.16×10^-6~ 6.25× 10^-6 for symbiosis Au,0.20×10^-6~ 1.00×10^-6 for associated Au,and 2.34% ~ 11.10% for associated S,respectively.The primary ore body Ⅳ-1 reaches a medium-scale silver reserve.There is still potential of searching for multi-metallic deposits in the mine area and surroundings.The discovery of this deposit has an important instructive significance in prospecting similar deposits.

关 键 词：金银矿床 化探异常 找矿前景 小罗卜沟 隆化 冀北 

分 类 号：P618.51[天文地球—矿床学]