贵州盘县架底金矿矿石特征初步研究

A Preliminary Study on Ore Characteristics of the Jiadi Gold Deposit in Panxian,Guizhou

架底金矿为产于茅口组与玄武岩组第一段之间的构造蚀变体(Sbt)中和峨眉山玄武岩第二段凝灰质玄武岩内的原生金矿床,是贵州西南部地区近年来发现的一种特殊的卡林型金矿床。通过野外观察和光薄片镜下鉴定,对架底金矿的矿石类型、矿石矿物组合、矿石结构构造及围岩蚀变特征的研究表明:呈半自形-他形结构、浸染状构造的黄铁矿与金矿的关系最为密切;硅化、黄铁矿化及毒砂化是寻找金矿的主要蚀变标志;凝灰岩和构造蚀变体(Sbt)是该区金的主要找矿标志。本文系统总结了矿石的基本特征及蚀变标志,以期对其周边区域找寻同类型金矿具有借鉴意义。

The Jiadi gold deposit is primary type gold deposit which occurs in the structural alteration body be- tween Maokou group and the first section of basalt group, and the second section tuffaceous basalt of Mount Emei basalt. It is a special Carlin-type gold deposit in the southwest of Guizhou discovered in recent years. Through field observation and the light sheet by microscopic identification, the ore type, mineral composition, ore struc- ture and wall rock alteration features of the Jiadi gold deposit demonstrate that the relationship between subhe- dral-anhedral shaped structure, disseminated structure of pyrite and gold deposit most closely. Silicification, py- ritization and arsenopyrite are the main corrosion variable symbol of the gold deposit. Tuff and structural altera- tion body is the main mark in gold prospecting in the area. This paper summarized the basic characteristics of ore and corrosion variable sign, with reference to its surrounding areas in search of the same type gold deposit.