The Research Of Metallogenic Geological Features And Tectonic In Weijiayu Gold Ore Of Hebei Province

WeiJiayu gold deposit is located in the northeast plunging crown of Fuping mantle branch structure in Hebei Province,In the Weijiayu area,there are 5 main veins(wj1,2,3,4,8).In this study,in the full use of on the basis of previous data,combined with field research progress,starting from the regional structure,combined geophysical characteristics and geochemical characteristics,through the study on the geological characteristics of the deposit,ore controlling structures,mineralization,from the point of view of mantle plume multistage evolution analysis of WeiJiayu gold ore controlling structure,establish WeiJiayu metallogenic model of gold deposit and guiding further ore prospecting work.the mainly cognition is as follows:(1)The research Area exposed Stratum are Nanying and Manshan group of Fuping group.ore bodies mainly host in Nanying group of the Fuping Group's biotite plagioclase gneiss;tectonic complex in the area,NNE the Wulonggou-shanghuangqi and Zijingguan-Lingshan deep fault in the region are the main structures of leading magma and ore hydrothermal.controlled by two major faults,the NW secondary structure directly control the distribution of ore vein,stable occurrence,pinch reproduction characteristics.partially,we can see Alteration mineralization internal crack of diabase dyke.(2)The subduction of the Pacific plate to the North China plate in Yanshanian Stage made Mantle uplift and greatly reducing the thickness of lithosphere,At the same time become the advantageous conditions for the multistage evolution of the mantle plume.Wei Jia Yu gold deposit is the result of the multistage evolution of mantle plume.(3)source of ore-forming materials:Isotope data statistics of Fuping mantle branch structure ore deposits shows that Ore forming fluid is mainly deep source and have mantle material joining.Magmatic activity is mainly in Yanshan period.(4)From the research area of magmatic rocks,structure,strata to identify ore control factors;In this area,Summarize the key prospecting directions as follows:Concealed rock mass around the rock mass of Luotuoan;Deep part of known ore bodies;Advantageous position of concealed rock mass;diabase dyke and NW trending tectonic fracture in metamorphic core complex area of mining area periphery whose nature is similar as thisdeposit;Quartz vein and altered rock zone around the mining area;Au?Ag geochemical anomaly areas surround Nannianyu and Lujiapu.