河北省围场县七棵树银多金属矿地质特征及找矿标志  

Geological Characteristics and Prospecting Indicator of Qikeshu Agpolymetallic Deposit in Weichang County,Hebei Province

作　　者：王纪昆 冀建军[1] 时培哲 孙培周 杨远东[1] 

机构地区：[1]天津华北地质勘查总院

出　　处：《现代矿业》2017年第6期13-18,25,共7页Modern Mining

基　　金：河北省地质勘查专项(编号:冀国土资勘字[2015]029号)

摘　　要：七棵树银多金属矿地处上黄旗构造岩浆带北部边缘,两组深大断裂(NE、EW向)的交汇部位,区域断裂构造活动和燕山期岩浆热液活动发育,区域上成型的银铅锌矿分布众多。结合区域地质调查、物化探工作成果,分析了区域地质背景、矿区地质特征及矿床地质特征。研究表明:(1)燕山期浅成斑岩、次火山岩对矿区成矿有利,矿体主要赋存于次级断裂构造内,NW、NNW向断裂构造和石英粗安岩控矿特征明显;(2)矿床成因属于中—低温火山—次火山热液型银多金属矿;(3)侏罗系张家口组为重要的含矿地层,物探、化探异常与铁锰矿化蚀变带相吻合,矿物组合以Au-Ag、Pb-Zn、Mo为主,为有利的找矿标志。上述分析对于该区进一步开展银多金属矿找矿勘探工作有一定的借鉴意义。Qikeshu Ag-polymetallic deposit is located at the northern margin of the Shanghuangqi tectonic magmatic belt,the intersection region of two groups of deep faults（NE-trending fault,EW-trending fault）,the regional tectonic activity and the Yanshanian magmatic hydrothermal activity are developed,Pb,Zn,Ag deposits with certain scale are developed in the area.Some geological work,geophysical and geochemical works are conducted in the area,some valuable results are obtained.Based on this results,the regional geological background,geological characteristics of the mining area and deposit are discussed in detail.The results show that：（1）shallow formation porphyry in Yanshanian and subvolcanic rocks are favorable for mineralization in the mining area,the ore-bodies are hosted in secondary fault structures,and significantly controlled by NW,NNW-trending tectonic and quartz coarse-rock;（2）the deposit is belongs to the low-temperature volcanic-subvolcanic hydrothermal Ag-polymetallic deposit;（3） Zhangjiakou Formation in Jurassic is the important ore-bearing strata in the mining area,the geophysical and geochemical anomalies are basically consistent with the iron-manganese mineralization alteration belt,the mineral composition is mainly for Au-Ag,Pb-Zn,Mo,which is the favorable prospecting indicator in the mining area.The above analysis results related to the geological characteristics and prospecting indicator of Qikeshu Ag-polymetallic deposit can provide some technical reference for the further prospecting and exploration work in the mining area.

关 键 词：银多金属矿 地质特征 围岩蚀变 次火山岩 矿床成因 找矿标志 

分 类 号：P618.2[天文地球—矿床学]