摘要
辽西新民金矿床大地构造位置位于华北板块北缘,燕辽成矿带的最东端,是与韧性剪切作用有关的金矿床。为在矿区深部探求新的盲矿体,以地质成矿理论为指导构建了成矿模式,同时开展了原生晕轴向分带序列研究,并对矿区59号勘探线100 m中段和ZK5908、ZK5909号钻孔样品数据进行了系统分析。结果表明:①建平群小塔子沟组地层为金矿床的形成提供了物源,据同位素研究显示,成矿物质来源与围岩、花岗岩具有一定的亲缘性,成矿流体来源主要为岩浆水和变质水,后期有大气水加入。②矿区受韧性剪切作用影响,含矿流体沿韧性剪切带向上迁移,Au主要以[Au(HS)_(2)]-形式迁移。随着成矿流体温度、压力、氧逸度及pH值发生改变破坏了金硫络合物的稳定性,使金发生沉淀、富集形成含金糜棱岩带。③因子分析和聚类分析显示,Au与Hg关系最为密切,Hg可作为找金的重要指示元素。矿体轴向分带序列从上至下为Mn→Ba→Ag→Zn→Au→Sb→Co→As→Ni→Mo→Bi→Cu→Hg,具有“反分带”和“前、尾晕共存”特征。④深部矿体预测评价指标(Hg×Au)_(P)/(Ni×Bi)_(P)在100 m中段为1.87,65 m标高为1.21,-63 m标高为2.03,该指标自矿体中部至尾部具有由降至升的趋势,表明矿区深部存在新的盲矿体,根据钻探工程验证结果推测矿区深部具有良好的找矿远景。
The geotectonic location of the Xinmin Gold Deposit in Western Liaoning Province is located on the northern margin of the North China plate and at the easternmost end of the Yanliao metallogenic belt.It is a gold deposit related to ductile shearing.In order to explore new blind orebodies in the deep part of the mining area,the metallogenic model is constructed under the guidance of geological metallogenic theory,the research on the axial zoning sequence of primary halo is done,and the sample data of 100 m middle section of No.59 exploration line,ZK5908 and ZK5909 drilling holes in the mining area is systematically analyzed.The results show that:①The strata of Xiaotazigou Formation of Jianping Group provide material source for the formation of gold deposit.According to isotope research results,the source of metallogenic material is related to surrounding rock and granite.The source of metallogenic fluid is mainly magmatic water and metamorphic water,and atmospheric water is added in the later stage.②Affected by ductile shear,ore bearing fluid migrates upward along the ductile shear zone,and Au mainly migrates in the form of[Au(HS)_(2)]-.With the change of temperature,pressure,oxygen fugacity and pH value of ore-forming fluid,the stability of gold sulfur complex is destroyed,gold is precipitated and enriched,and gold bearing mylonite belt is formed.③Factor analysis and cluster analysis show that Au is most closely related to Hg,and Hg can be used as an important indicator element for gold prospecting.The axial zoning sequence of the orebody from top to bottom is Mn→Ba→Ag→Zn→Au→Sb→Co→As→Ni→Mo→Bi→Cu→Hg,with the characteristics of"reverse zoning"and"coexistence of front and tail halos".④Prediction and evaluation index of deep orebody(Hg×Au)_(P)/(Ni×Bi)_(P) is 1.87 at 100 m middle section,1.21 at 65 m elevation and 2.03 at-63 m elevation.This index has a"downward upward"trend from the middle to the tail of the orebody,indicating that there is a new blind orebody in the deep part of the mining area.According to the verification results of drilling engineering,it indicates that there is a good prospecting prospect in the deep part of the mining area.
作者
许云鹏
袁和
XU Yunpeng;YUAN He(Liaoning Fourth Geological Team Limited Liability Company,Fuxin 123000,China)
出处
《金属矿山》
CAS
北大核心
2022年第3期149-157,共9页
Metal Mine
基金
辽宁省自然资源科技创新项目(编号:LZ20190032)。
关键词
金矿
深部找矿
成矿模式
原生晕分带
深部矿体预测模型
gold deposit
deep prospecting
metallogenic model
primary halo zoning
prediction model of deep orebody
