福建太阳山破碎带蚀变岩型金矿形成的矿相学证据

系统的矿相学研究表明,太阳山金矿矿石矿物主要为黄铁矿、磁黄铁矿、含银自然金、闪锌矿、黄铜矿;矿床围岩蚀变种类较多,主要有硅化、绢云母化、钾长石化、石墨化。矿石结构包括自形—半自形粒状结构、假象结构、压碎结构、包含结构、错断结构等,矿石构造包括浸染状、微脉浸染状、脉状、网脉状构造。金主要以包裹金、粒间金、裂隙金、赋存于石英、黄铁矿、磁黄铁矿中。矿区内常见的是碎裂岩和糜棱岩化岩石,很少见到糜棱岩,不存在超糜棱岩、构不成糜棱岩系列。本矿床地质特征与典型的破碎带蚀变岩型金矿山东焦家金矿极为相似。因此,太阳山金矿属于典型的破碎带蚀变岩型金矿。

Taiyangshan altered tectonite-type gold ore deposit in Fujian province: evidences from mineralography

Systematic ore mineralogy research shows that the Taiyangshan gold deposits ore minerals are mainly composed of pyrite,pyrrhotite,silver-bearing native gold,sphalerlite and chalcopyrite,etc.The wall-rock alterations include silicification,sericitization,kfeldsparization,graphitization and migmatization,etc.The ores have euhedralsubhedral-pseudomorphic crush texture,poikilitic texture,pressure texture,feint texture and offset texture,and have impregnated structure,vein structure and net vein structure.Gold mainly occur in pyrite,pyrrhotite and quartz,as encapsulated gold,grained gold,fractured gold,adsorbed gold.Cataclastic and mylonitization rock are common in the mining area,but mylonite is rarely,ultra-mylonite is not existed.The geological characteristics are extremely similar to the Jiaojia gold deposit of typical altered tectonite-type gold in Shandong province.Consequently,the Taiyangshan gold deposit is a typical altered tectonite-type gold ore deposit.