山东唐家沟金矿床地质特征及深部预测

唐家沟金矿位于胶东牟平-乳山金矿带西南段;历经数次勘查工作,近期获得较大突破,累计金金属资源量规模达到近大型。矿区内出露地层主要为古元古代荆山群变质岩及新生界第四系,构造以古元古代褶皱构造和中生代断裂构造为主,其中含金矿化蚀变带受NNE向、NE向、近EW向断裂控制。主要控矿构造呈NNE向、近EW向展布,矿石类型主要为黄铁矿化石英脉、黄铁矿化花岗质碎裂岩和黄铁矿化大理岩,矿化具多期活动特点。研究发现,控矿构造局部引张段与其他构造交会处是储矿的有利部位,矿化蚀变叠加地段预示着深部成矿可能性极大。深部预测NNE向金矿化断裂构造与NE向硫化物富集带交会部位,残留荆山群地层与侵入岩接触部位、接触带与NE向硫化物富集带交会部位为成矿的有利地带。

Analysis on Metallogenic Enrichment Regularity of Tangjiagou Gold Deposit in Shandong Province

Tangjiagou gold deposit lies in southwest part of MupingRushan gold ore belt in Jiaodong area. After several times exploration work, larger breakthrough has been gained recently. The accumulated gold resources nearly reach large scale. Main outcropped strata in the mining area are Jingshan group metamorphic rocks in lower proterozoic era and Cenozoic Quarternary.Structures are mainly composed of Paleoproterozoic fold structures and Mesozoic fault structures. Gold mineralization altered belts are controlled by faults with the trend of NNE, NE and nearly EW trend. Main ore controlling structures distributed in NNE trend and nearly EW trend. Ore types are mainly pyritized quartz vein, pyritized cataclastic rock and pyritized marble. Mineralization has the characteristics of multistages. It is found that the orecontrolling structure and other structures as well as bifurcation of the orecontrolling structures are favorable orecontained space. Mineralized alteration superposition areas indicate great prospecting potentiality in deep part. It is predicated that intersection areas of gold mineralization structures with the trend of NNE and sulfide enrichment areas with the trend of NE, intersection areas of strata in Jingshan group and intrusive rocks, and the intersection areas of contact zones and sulfide enrichment zones with the trend of NE are metallogenetic favorable zones.