塞尔维亚东部Z.Brdo大型金矿床的发现与意义

Wang Guoping.Discovery and significance of the Z.Brdo large gold deposit in eastern Serbia[J].Geology and

Z. Brdo金矿床是近几年在塞尔维亚东部Timok火山岩带上新发现的一个大型新类型的金矿床,是Timok火山岩成矿带继C. Peki斑岩型铜金矿床之后的又一较大找矿突破。本文在野外工作的基础上,结合室内岩矿鉴定,矿床原生晕等综合研究,与典型的高硫型、中硫型、低硫型矿床进行对比,对矿床地质特征、物化探异常特征、矿床成因类型以及与区内斑岩成矿系统的成因联系进行了分析。研究认为:(1)Z.Brdo金矿床受北西向断层系统控制,赋存于泥质黑云角闪安山质火山碎屑岩(K2ωαhb)与绢英岩化似斑状角闪斜长安山岩(Pgαq)岩性界面,总体与区内斑岩型-高硫型矿床的控矿构造及岩性界面一致;(2)矿体围岩蚀变为高岭石化、蒙脱石化、绢云母化、绿泥石化、方解石化,矿石由角砾状、网脉状石英-方解石-重晶石-黄铁矿-毒砂组成,矿化富集与角砾岩密切相关,其中角砾化程度越高、硫化物脉体越发育、高岭石化、绢英岩化程度越高,金矿化富集越好;(3)航空磁法测量显示出北西向断裂构造为主要的控矿构造,激发极化法测量显示矿体表现为低阻高极化的特征,原生晕测量显示含矿构造蚀变带具有前缘晕BaAg-Zn 1→近矿晕As-Sb-Au→尾矿晕Pb-Zn 2-Cu的分带规律。以上综合研究表明Z. Brdo金矿床为受断裂构造控制的浅成低温热液型金矿床。Z. Brdo金矿的发现说明Timok火山岩带内围绕斑岩→浅成低温热液成矿系统的勘查工作仍大有可为,下一步可借鉴Z. Brdo金矿的地质、物化探异常特征在区内开展同类型金矿床的找矿探索工作。

The Z.Brdo gold deposit is a new type of large gold deposit discovered in the Timok volcanic belt,eastern Serbia in recent years.It is another prospecting breakthrough in the Timok volcanic belt after the discovery of the C.Peki porphyry type Cu-Au deposit.On the basis of field work,combined with rock and ore identification,primary halo research,and compared with typical high-sulfur,intermediate-sulfur and low-sulfur deposits,this work analyzed the geological characteristics,geophysical and geochemical anomalies,genetic types of the deposit and the genetic relationship with the porphyry metallogenic system.It is concluded that:(1)The deposit is controlled by the NW-trending fault system and occurs at the lithologic interface of the mud biotite hornblende andesitic pyroclastic rock(K_(2)ωαhb)and the sericitic porphyritic hornblende plagioclastic andesite(Pgαq),which is generally consistent with the ore-controlling structure and lithologic interface of the porphyry and high-sulfur deposits in the district.(2)The surrounding alterations include kaolinization,montmorillization,sericitization,chloritization,calcilization.The ore is composed of brecciated and stocked quartz-calcite-barite-pyrite-arsenic pyrite.The endowment is closely related to breccia.The higher degree of the breccia and the more veins is,the better the gold mineralization and enrichment is.(3)The aeromagnetic survey shows that the northwest-trending fault structure is the main orecontrolled structure,the IP survey shows that the ore body exhibits low resistivities and high chargeabilities,and the primary halo survey shows that the ore-bearing structural alteration zone displays the zoning of the front halo Ba-Ag-Zn 1→the near halo As-Sb-Au→the tailings halo Pb-Zn 2-Cu.The above complex shows that the Z.Brdo gold deposit is an epithermal gold deposit controlled by fault structure.The discovery of the Z.Brdo gold deposit indicates that there is still potential in the exploration of porphyry→epithermal ore-forming system in the Timok volcanic belt.The next step is to refer to the geological,geophysical and geochemical anomalies characteristics of Z.Brdo gold deposit to carry out prospecting and exploration of similar gold deposits in this district.