陕西金龙山金矿矿石类型及其成因探讨

Discussion on the Ore Types and Genesis of Jinlongshan Gold Deposit,Shaanxi Province

通过在南秦岭地区进行野外调查及室内岩石矿物研究,将金龙山金矿的原生矿石类型按金属矿物赋存的构造状态划分为4类:浸染状金矿石、片理化金矿石、细脉状金矿石和构造角砾岩型金矿石。浸染状及片理化金矿石是赋存在受S、N、W挤压作用的近EW向展布的地层中的压扭性形变层间剪切带中,确立了层间剪切带型矿石为主要矿石类型,层间剪切带型矿石为主要矿石类型,构造角砾岩型矿石为次要矿石类型。层间剪切带型矿化体是成矿流体在地层里及地层层间渗透形成的,而断裂构造角砾岩型矿化体是成矿流体沿着断裂构造带扩散形成的。金龙山矿区的矿化体基本由层间剪切带型矿石组成的层间剪切带型矿化体和由构造角砾岩型矿石组成的构造角砾岩型矿化体2种类型的矿化体交会构成。研究金龙山矿区矿石类型及矿化体类型,分析了金龙山金矿的成矿机理,纠正了以往的就矿连矿的错误认识,为今后的矿体连接提供了依据,对金龙山金矿床勘查工作具有指导意义。

Through the field investigation and indoor rock mineral research in South Qinling,Jinlongshan primary ore types is divided into four categories hy the structure of the metal mineral occurrence state：disseminated gold ore,lamellar gold ore, veinlet gold ore, structural breccia type gold ore.The disseminated gold ore and lamellar gold ore occurrence in the compressive shear deh）rmation interlayer shear zone,which is nearly EW to distribution and being squeezed from S,N and W,and established the interlayer shear zone type ore is the main ore type.Interlayer shear zone type ore is the main ore type,and tectonic breccias＇ type ore is secondary.The formation of interlayer shear zone lype mineralization body is the result of the ore-forming fluid permeating stratum and the between layers, while the fracture structural breccia type body is tbrmed by the ore-ibrming fluid spreading along the fauh belt.The mineralized bodies ot＂ Jinlongshan gold deposit is tormed by the interlayer shear zone type mineralization and the tectonic breccia type mineralization.In this paper,we study the ore types and mineralization types,analyze the mineralizalion mechanism,and correct the mistakes of the past ore body connection.It will provide a basis for fulure orebody connections,also has guiding significance fbr gold deposit exploration in Jinhmgshan gold deposit.