Structural Regularity Of Ore-controlling And Mineralization Prediction Of Qingchengzi Gold Ore Field,in Liaodong

Qingchengzi Gold Mine is located in Qingchengzi Town,Fengcheng City,Liaoning Province.The geotectonic location is located in the Paleoproterozoic Liaoji Rift Valley in the eastern part of the northern margin of the North China Craton.Taking the ore field and the Xiaotongjiapuzi mining area in the orefield as an example,the tectonic characteristics and ore-controlling laws of the ore field are studied,and the paleo-tectonic stress field is restored,which provides a scientific basis for further prospecting prediction.The tectonic development in the ore field is mainly composed of EW-trending folds and NW-trending faults.The NW-trending faults are arranged at nearly equal intervals from NE to SW,followed by Gangzizi fault,Da Moling fault,and Jianshanzi fault.It broke in the upper ditch.Both the Baiyun mining area and the Xiaotongjiapuzi mining area are located between the Jianshanzi fault and the Yushang fault.The type of deposit is mainly silicon-calcium altered rock type,and the ore body distribution is controlled by fracture.The ore-controlling structures in the orefield and the Xiaotongjiapuzi mining area are mainly NW and near EW faults.The ore bodies of the two mining areas are soothing and wavy,with features such as pinch-out reproduction and shrinkage.The ore bodies mainly exist in the upper part of the Dashiqiao Formation of the Liaohe Group,the Gaixian Formation and the contact sites of the two,and along the ore-controlling structures,silicification,potashation,sericitization,chlorite,graphitization and other surrounding rock alterations are developed.There are some differences between the two mining areas.First,the correlation between their ore body thickness and gold grade,the correlation between the two areas of the Baiyun mining area is small,and the quality of some small ore bodies is higher,while the thickness of the ore body in the Xiaotongjiapuzi mining area.The correlation with the gold grade is higher;the lateral direction of the ore body in the second mining area,the lateral direction of the ore body in the Baiyun mining area is SW direction,and the lateral direction of the ore body in the Xiaojiajiabaozi mining area is NW direction,along the high grade part The lateral distribution of the ore body.The principal stress directions of the tectonic stress field in the ore-forming period of the two mining areas are the same,all in the NW-SE direction,which is consistent with the principal stress direction of the Jianshanzi fault tectonic stress field.Therefore,the metallogenic period of the Qingchengzi gold ore field may be affected by the Jianshanzi fault.Impact.The faults after mineralization are mainly NW and NE directions.The main stress directions of the tectonic stress field after ore-forming are mainly NW-SE and NE-SW.Through the analysis of S isotope,the ore-forming materials in the ore field are not the same.The ore-forming materials in the Baiyun mining area are mainly from the magmatic hydrothermal fluid.The ore-forming materials in the Xiaotongjiapuzi mining area are mainly from the stratum.Based on the characteristics of the mining area and the characteristics of the ore-controlling structure,the ore bodies of the two mining areas are predicted.It is speculated that the No.60-2 ore body in the Baiyun mining area is in the middle of-300 m,and there will be a high-grade ore body between the 42-46 exploration lines.The Xiaotongjiapuzi II mine will have a high-grade ore body in the middle of the-200 m,near the 48 th line.