南秦岭东江口岩体中丰富金矿矿床特征与成因浅析

发布时间：2018-04-29 15:30

本文选题：南秦岭 + 东江口岩体　；参考：《地质与勘探》2017年01期

【摘要】：陕西省宁陕县丰富金矿产于南秦岭构造带东江口岩体内,为一中型规模金矿床,赋矿围岩为黑云母二长花岗岩。矿床形成于印支-燕山期秦岭造山过程中由碰撞向伸展构造体制转变的后碰撞构造环境,成矿时代限定为200Ma左右的燕山早期,矿床类型为硫化物石英脉型和破碎带蚀变岩型。金的赋存状态有包裹金、裂隙金及晶隙金三种,以裂隙金和晶隙金为主,具有多期成矿特征。围绕主岩浆期后超浅成-浅成侵入的中基性岩脉、岩枝、岩株呈环状展布的缓倾斜断裂是主要的控矿和赋矿构造,成矿作用与主岩浆期后火山-次火山作用或隐蔽爆破作用引发的热液作用有关。
[Abstract]:The rich gold deposits in Ningxian County, Shaanxi Province are located in the Dongjiangkou rock body of the southern Qinling structural belt, which is a medium scale gold deposit, and the host rock is biotite monzomorphic granite. The deposit was formed in the post-collisional tectonic environment, which changed from collision to extensional tectonic system during the Qinling orogenic process of Indosinian to Yanshanian period. The metallogenic age was limited to the early Yanshanian period about 200Ma, and the deposit type was sulphide quartz vein type and altered rock type in broken zone. There are three kinds of gold, fissured gold and intergranular gold, which are mainly fissured gold and intergranular gold, and have multi-stage metallogenic characteristics. The main ore-controlling and ore-hosting structures are the moderately inclined faults of ultrashallow-epigenetic intrusive intermediate-basic vein, branchlets and rock plants after the main magma period, which are mainly ore-controlling and ore-hosting structures. The mineralization is related to the hydrothermal process caused by the volcano-subvolcanism or concealed blasting after the main magmatic epoch.
【作者单位】：中国地质科学院矿产资源研究所国土资源部成矿作用与资源评价重点实验室;陕西矿业开发工贸公司;陕西省地质矿产勘查开发总公司;
【基金】：中国地质调查局项目(12120114054701)资助
【分类号】：P618.51

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