湖南省桂阳县曹家冲锡矿区地质特征及找矿方向探讨

Geological Characteristics andDiscussion on Prospecting Direction of Caojiachong Tin Mining Area in Guiyang,Hunan Province

曹家冲锡矿床位于南岭中段水口山—香花岭钨锡铅锌金银多金属成矿带,属中高温矿床岩浆热液矿床。矿区矿体严格受断裂控制,具侧列及隐伏、半隐伏现象,矿体总体近水平展布,由矿体中心往两侧矿化逐渐变差;矿体主要产出于介头单元与其它单元的内外接触带,构造裂隙密集发育、矿脉厚度宽大,围岩蚀变具多种硫化物叠加,往往矿化强、矿体厚度大。本文通过总结矿区成矿地质条件、矿体特征、矿石结构构造、共生矿种之间关系等方面,分析矿床成矿规律,提出找矿方向建议。

The Caojiachong tin deposit belongs to the Shuikoushan-Xianghualing tungsten-tin-lead-zinc-gold-silver polymetallic metallogenic belt,the mid-Nanling region.It's produced in Dayishan Composite pluton,belongs to a mediumhigh temperature dominated by Magmatic hydrothermal.The ore body is strictly controlled by faults,with lateral rows,concealed and semi-concealed phenomena.The ore body is generally distributed nearly horizontally,and the mineralization gradually deteriorates from the center of the ore body to both sides.The ore bodies are mainly produced in the inner and outer contact zones between the Jietou unit and other units.The tectonic fissures are densely developed,the ore veins are thick,and wall-rock alteration is superimposed by various sulfides,often with strong mineralization and thick ore bodies.by summarizing the metallogenic geological conditions,ore body characteristics,ore structure,and the relationship between the symbiotic minerals in the mining area,this paper analyzes the metallogenic regularity of the ore deposit,and puts forward suggestions on the direction of ore prospecting.