| Dusong area is located in the intersection part of Wanyang mountain-Zhuguang mountain north-south uplift belt and Wanyang mountain northeast uplift belt.It is,controlled by Zhuguang mountain complex rock mass,located in the south of Lujing uranium ore field and the west of Chengkou ore field.Many uranium deposits(points)have been found around the study area,but the research degree of this area is low at present.This study studies the geological characteristics,petrological characteristics,uranium mineral characteristics and element geochemical characteristics of the study area,summarizes the ore controlling factors and uranium mineralization,and discusses the genetic mechanism of the deposit,which is conducive to the scientific evaluation of its prospecting potential and provides a theoretical basis for the further exploration and mining of uranium deposits.On the basis of the previous regional research results and field investigation,through microscopic thin section identification,element geochemical analysis,geophysical and geochemical survey and analysis,surface engineering disclosure and so on,this paper studies the geological characteristics,petrological characteristics of ore bearing beds,characteristics and genesis of uranium minerals,trace elements and geochemical characteristics of rare earth elements in Dusong area,constructs its three-dimensional structural framework,and summarizes the geological conditions of uranium mineralization Metallogenesis and metallogenic law.In this paper,the uranium metallogenic model is established,its deep prospecting potential is evaluated,and the uranium prospecting prospect is defined.The following understandings have been obtained:(1)The granite bodies in Dusong area are high silicon content,high alkali,rich potassium,potassium greater than sodium,aluminum supersaturation and less dark minerals and belong to S-type granite.The rocks are obviously rich in Th,K,Nd,Hf and Sm and deficient in Sr,P,Ti and Eu,which indicats that the granites come from the continental crust with high maturity.The rock mass has a high U content(average21.97μg/g),low Th / U value(average 1.41),indicating the ability to provide sufficient uranium source for uranium mineralization.(2)Uranium elements are present in the ore as both free-standing uranium minerals and uranium in the adsorbed state.The independent uranium minerals are mainly secondary minerals of uranium,such as calcium-uranium mica,etc.;the adsorbed uranium is mainly present in silicified fractured rocks or silicified clinopyroxene breccias cemented by silica,hematite,limonite,etc.(3)The alteration of the surrounding rocks mainly includes silicification,potassium feldspar,hematite mineralization,chloritization,sericitization,etc.,and epigenetic oxidation includes limonitization,hydromorphism,kaolinization,etc.Among them,silicification(red chalcedony veins,microcrystalline quartz veins,siliceous breccia)and hematite mineralization are closely related to uranium mineralization,and are more favorable to uranium mineralization when the above alterations are superimposed.(4)The uranium deposit is a post magmatic hydrothermal type.Its mineralization is controlled by granites,fault structures and basic dykes.Granites are the main source of metallogenic hydrothermal solution,fault structures are the migration channel and ore holding space,and basic dykes are a chemical barrier,which is beneficial to metallogenic precipitation.(5)Based on the metallogenic model and geophysical and geochemical exploration results,a total of two prospecting prospects have been delineated,which are two grade II metallogenic prediction areas. |
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