北秦岭西峡宋庄石墨矿床地质特征及成因分析

Geological Characteristics and Genetic Analysis of the Songzhuang Graphite Deposit in the Xixia Area of the North Qinling Mountains

西峡县宋庄石墨矿是秦岭造山带北秦岭朱阳关—柳泉铺石墨成矿带新发现的一处大型的大鳞片状晶质石墨矿床,矿区内主要出露下元古界秦岭岩群地层,呈北西—南东向展布,矿体集中分布于秦岭群雁岭沟岩组地层中。矿区找矿标志明显,片度测定结果显示石墨片径较大,表明秦岭群雁岭沟组地层内石墨矿质量较好,矿石易选,具有较好的开发前景。本文通过总结宋庄石墨矿地质特征和物探特征,分析了成矿期次及碳质来源,认为接触变质成矿期为大鳞片石墨矿成矿期,区内碳质来源于有机物,其矿床成因为区域变质型晶质石墨矿床。

The Songzhuang graphite deposit in Xixia county is a large scale crystalline graphite deposit newly discovered in the Zhuyangguan Liuquanpu graphite mineralization belt of the northern Qinling orogenic belt.The mining area mainly exposes the Lower Proterozoic Qinling rock group strata,which are distributed in a northwest southeast direction.The ore bodies are concentrated in the Yanlinggou rock group strata of the Qinling group.The ore exploration indicators in the mining area are obvious,and the results of flake size measurement show that the graphite sheet diameter is relatively large,indicating that the quality of graphite ore in the Yanlinggou formation of the Qinling group is good,the ore is easy to select,and has good development prospects.This article summarizes the geological and geophysical characteristics of the Songzhuang graphite deposit,analyzes the mineralization stages and carbon sources,and believes that the contact metamorphic mineralization stage is the large-scale graphite deposit mineralization stage.The carbon in the area comes from organic matter,and the deposit is formed by regional metamorphic crystalline graphite deposits.