| In the southeastern part of the Longshanshan uranium metallogenic belt,located in the Qinqi Kun uranium metallogenic area Qilian-Kunlun uranium mineralization province Longshoushan-Qilian Mountains uranium metallogenic belt,the tectonic site in the Paleozoic continental margin of the transition,in the geological structure evolution process,Experiments of the multi-stage tectonic evolution of lysis-closure-recleavage-reclosure.The southeastern part of Longshoushan is an important uranium-uranium-bearing metallogenic belt in the northwest of China.It has been found that uranium deposits and 52 uranium deposits and mineralization sites of Hongshiquan,Xinshuijing,Jiling and revolutionary ditch have been found to have Good uranium mineralization conditions.In this paper,based on the research results obtained in recent years,this paper analyzes the existing uranium deposits and new ones,which are based on the study of the regional geological background,stratigraphic characteristics,magmatic rock characteristics and tectonic characteristics.The results show that the ore-forming geological conditions and metallogenic regularities of uranium deposits and belts are analyzed,and the prospecting targets are selected based on geophysical and drilling information.The comprehensive analysis shows that the southeastern end of the Longshoushan uranium ore belt has favorable uranium mineralization conditions,including:?1?Regional geologic background of granite-type uranium mineralization: Due to the development of Qilian rift and the influence of many activities,there are some metaphysical metasomaticals in the Longshoushan and the northern ridge of the northern Qilian Mountains on both sides of the Hexi Corridor Mineralization,in which the first mountain arch in addition to alkali metasomatism uranium mineralization,there are crystal-like white-bit type,silicified belt type.(Uranium content is relatively high(3.6×10-6 5.6×10-6);a total of 28 large and medium rock,exposed Area of 590Km2,uranium content is generally high,such as the average Jixing rock mass of 7.5×10-6,red Shiquan Wei Jing white rock up to 11.9×10-6,is a direct uranium source of mineralization;Tectonic and secondary fold have a new relationship,along the main fault on both sides of the dense secondary structure is often a favorable part of the uranium ore body;hydrothermal activity range,intensity,alkaline hydrothermal activity to form alkali metasomatism and Alkaline-type uranium mineralization,acid-rich siliceous hydrothermal activity to form silicified zone and siliceous-type uranium mineralization,showing different series of characteristics.?2?The structure and lithologic conditions of the metasomatism-type uranium mineralization are: the middle and eastern tectonic scale is large,the activity period is many times,and the ore-controlling characteristics are obvious.Along the road ditch fault zone,there are distributary deposits,new well deposits and 240,,A small white precarious ditch and a series of mining points,mineralization point,Jiling Mine deposit is located in the road ditch F101 under the plate 10 300 m range of sodium feldspar granite,ore body side row,the new well deposit is located in the road ditch fracture The upper part of the ore body and the ore body are larger in the upper feldspar granite of the F121,and the hillside ditch in the middle of the Jialing rock mass controls the ore and mineralization points of 40,36,24,26 and other mineralization points.The mine has found a good mineralization clue in the middle fault zone of Ma Dugou and Jilingling.In the middle of the period and the Caledonian granites are extensively developed to form a large-scale favorable uranium mineralization granite belt,there are 28 large and small rock masses in the area,the exposed area of 590Km2;granite uranium content is higher,Jiling rock average of 7.45 × 10-6,and the magmatic rock mass in Hongshiquan is 11.88 × 10-6.At the late stage of magmatic evolution,the uranium content in granite is increasing,which is one of the main uranium sources.It is found that the main uranium mineralization Point within the range of 100 meters inside and outside the contact zone,uranium mineralization accounted for about 65%;times for the Redstone area and Castle Peak rock.?3?Sodium metasomatism hydrothermal alteration is the most favorable segment of the metasomatic uranium mineralization: The hydrothermal activity type in the study area is mainly alkaline hydrothermal activity and acid rich siliceous hydrothermal activity,and the alkaline hydrothermal activity forms alkali The formation of silicic acid and siliceous-type uranium mineralization,showing different series of characteristics;sodium fossil petrochemical development and the formation of sodium metasomatism is a metasomatic uranium ore There may be important signs,hydrothermal evolution is perfect,marking the Fe,Mg,U evolution of the various veins relatively development,mineralization is good.Alkaline metasomatism is very developed,divided into four stages,namely: 1)potassium and sodium metasomatosis,2)Regional potassium account,3)Low temperature hydrothermal sodium and calcium account,4)Mineralization sodium account;and has a certain band And the mineralization zone is more obvious,which is divided into petrified and crushed sodium metasomatous rock zone,carbonated crushed sodium metasomatous rock zone,hematite mineralized crushed sodium metasomatous rock zone,"Sodium metasomatism and" linear "sodium metasomatism,the larger" face "sodium metasomatic rocks control the output of large ore bodies.?4?Uranium mineralization has experienced the formation of the base and cap rock formation of the first mountain;the Qilian rift thrust,the deep crustal hot melt,the large-scale alkaline granite slurry intrusion stage;the magmatic late and post-Uranium formation stage;tectonic movement uplift,upper caprock erosion,ore body exposed,for the postnatal transformation stage.The permafrost type uranium prospecting model indicates the spatial relationship of tectonics,lithology,alteration and mineralization.According to the tectonic superposition order,rock contact relation,alteration zone spatial distribution and geophysical results,In the study area,the hydrothermal blasting breccia related to the trending structure of the road ditch fault is to be explored in this area,which can be used as a breakthrough point for the next prospecting work.?5?The controlling factors of uranium in the study area are mainly tectonic,lithologic and hydrothermal alteration?sodium metasomatous rocks?.In the tectonic crossing and alteration superposition sites are favorable sections of uranium mineralization.Mine potential,such as the new well ore body larger vertical wall,in the eastern part of the eastern part of the deposit there is the possibility of the second enrichment zone;target area of ore,mineralization between the points closely,there are new uranium deposits of mineralization potential.Based on the analysis of the ore-controlling factors of Hongshiquan,Xinshuijing,Jiling and Gouminggou uranium deposits,In the southeastern part of Longshoushan,it is preferable to select the orebodies for the granite-type uranium in the Niugou-Ma Lianjing,Lvcaogou-Yushigou sodium metasomatic rock type uranium prospecting target area and Huoshiling-Xiaoqingyang sodium metasomatic uranium prospecting target area. |
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