江西凤凰坑硅石矿矿床地质特征与找矿标志

Geological Characteristics and Prospecting Indicators of Fenghuangkeng Silica Deposit in Jiangxi

凤凰坑硅石矿是江西省近年来探明的一处中型硅石矿床,为探明该硅石矿床的控矿因素,对矿床地质特征进行分析,浅析找矿标志。结果表明:凤凰坑硅石矿由2个矿体组成,赋存于北北东向构造破碎带中,矿体形态、产状严格受构造破碎带控制。矿石矿物为石英,呈微晶、细晶结构,以块状构造为主,次为晶洞状、晶簇状、角砾状等;矿石类型为致密块状石英岩型。凤凰坑硅石矿为受断裂控制的热液充填型矿床,找矿标志为北东向、北北东向大断裂,燕山期酸性花岗岩体以及突起的正地形(山脊)。

Fenghuangkeng silica deposit is a medium-sized silica deposit discovered in Jiangxi Province in recent years. In order to find out the ore-controlling factors of the silica deposit,the geological characteristics of the deposit are analyzed and the prospecting criteria are analyzed. The results show that the Fenghuangkeng silica ore consists of two ore bodies,occurring in the NNE tectonic fracture zone. The shape and occurrence of the ore body are strictly controlled by the tectonic fracture zone. Ore minerals are quartz,microcrystalline,fine-grained structure,mainly block structure,followed by crystalline holes,crystal clusters,breccia and so on. The ore type is dense massive quartzite type. The Fenghuangkeng silica mine is a hydrothermal filling deposit controlled by faults. The prospecting criteria are NE-trending and NNE-trending large faults,Yanshanian acidic granite bodies and protruding positive terrain(ridges).