摘要
老里湾银矿床位于华北板块南缘、华熊台隆崤山断隆东部,属小秦岭—崤山金银成矿带。结合矿区地质工作成果,对区域地质背景、矿区及矿床地质特征进行了分析,并对构造、岩浆岩的控矿条件进行了讨论,结果表明:(1)老里湾花岗岩体为燕山期侵入,其分布受NW向、NE向断裂构造控制;(2)矿体赋存于老里湾花岗岩体内及附近围岩的构造破碎带中,主要受断裂构造控制,矿体呈脉状、囊状、透镜状等不规则形态产出,倾向上呈叠层状,平面上具右行斜列现象,矿体大部分呈隐伏状产出;(3)矿体主要赋存于斑状二长花岗岩中,矿石与赋矿岩石的化学成分基本一致,矿石中的有用金属矿物为银矿物、闪锌矿、方铅矿,其中,银矿物主要为自然银、硫铜银矿;(4)矿区矿化蚀变期次可划分为早期、中期、晚期和风化淋滤4个阶段,其中,中期阶段为主要成矿阶段,晚期阶段为次要成矿阶段;(5)矿床的形成与花岗岩浆活动存在密切的时空关系。在上述分析的基础上,对该矿床成因进行了探讨,认为该矿床为受断裂构造控制的中—低温热液脉型矿床。上述分析对于在崤山地区进一步开展银多金属矿找矿工作有一定的参考价值。
The Laoliwan silver deposit is located in the southern margin of the North China Block and the eastern part of Xiaoshan fault-uplift of Huaxiong platform uprise,it belongs to the Xiaoqinling-Xiaoshan Au-Ag metallogenic belt. Based on the geological working results of the mining area,the regional geological background,the geological characteristics of the mining area and ore-bodies are discussed,besides that,the ore-controlling conditions of structure and magmatic rock are studied. The results show that：（1）the Laoliwan granites is formed by the intrusion in Yanshanian,and its distribution is controlled by NW and NE fault structure;（2）the ore-bodies are hosted in the Laoliwan granites and the tectonic crushed zones of the surrounding rocks near the Laoliwan granites,the ore-bodies are controlled by fault structures,the ore-bodies are occurred with irregular shapes such as vein,cystic and lenticular,the ore-bodies are distributed as lamination shape in the tendency direction,while in the plane,they are presented as the characteristics of right slanting columns,besides that,most of the ore-bodies in the mining area are occurred as concealed shapes;（3） the ore-bodies are distributed in porphyritic monzonitic granite,the geochemical compositions of the ores are basically consistent with the ones of ore-bearing rocks,the useful metal minerals in ores are silver minerals,sphalerite and galena,among them,the silver minerals are mainly for natural silver and stromeyerite;（4）the mineralized alteration period time in the mining area can be divided into early period,middle period,late period and weathering leaching period,among them,the middle period is the main metallogenic period,the late period is the secondary metallogenic period;（5）the relationship between the deposit formation and granite magma activity is close. Based on the above study results,the deposit genesis of the mining area are further studied,the results show that the deposit in the mining area is the middle-low temperature hydrothermal vein type one that is controlled by faults. The above discussion results in the paper can provide some reference for the further prospecting work of Agpolymetallic deposits in Xiaoshan area.
作者
张国跃
Zhang Guoyue(The First Geo-exploration Institute, Henan Province Bureau of Geo-exploration and Mineral Developmen)
出处
《现代矿业》
CAS
2017年第4期46-51,共6页
Modern Mining
关键词
银矿
区域地质背景
地质特征
控矿条件
矿化蚀变
矿床成因
Silver deposit
Regional geological background
Geological characteristics
Ore-controlling conditions
Mineralized alteration
Deposit genesis
