Research On Prospecting Perspective And Metallogenic Target Delineation Of Xialayaodong Area In Subei Country Of Gansu Province

Xialayaodong area in SuBei country of Gansu province is located in the hinterland of the south Qilian Mountain and the traffic is inconvenience,where was still a potential area for geological prospecting before the 1990 s,In recent years,it has been made remarkable results,but most of the work is limited to evaluate single mineral occurrence,which is lack of system research for the metallogenic tectonic background,typical ore deposit ore-controlling factors,regional metallogenic regularity and model,prospecting prospective,and severely restricts to know the prospecting direction and prospecting future of this area.All these severely restrict the understanding of prospectingin this area.The paper is relaying on the project of " 1:50000 mineral prospective study of Xialayaodong etc.four maps in Subei Country of Gansu Province ".The geology,minerals,geophysical and geochemical exploration datum are systematically studied by field exploration,investigation,sampling,in-situ geophysical prospecting,chemical prospecting,laboratory tests based on the comprehensive analysis of the investigation datum and the results of scientific research in the area accumulated over the last several decades.The geological background and geochemical anomalies characteristics of this area are analyzed and compared by analogy method.Further more,the prospecting perspective and metallogenic target areas are delineated.The main research contents and results are as follows:(1)The regional geological environment,topography and geomorphology,neotectonics and formation lithology of the area are analyzed and evaluated with the theoretical guidance of tectonic theory and geological system theory.This paper has a systematic understanding of metallogenic geology and mineralization on the basis of existing research achievements.(2)The geochemical anomalies characteristics of this area are analyzed by systematic 1:50000 stream sediment surveying.Then 25 comprehensive anomalies are delineated.All these anomalies sits are verified by 1:10000 geological measurement,trenching exploration and so on.(3)Comprehensive analysis and analogy blank area and the known ore deposit geological background and its geochemical anomaly characteristics,through this method,it delineates the metallogenic perspective prediction area and target zone.It is divided into four metallogenic perspective regions: Shiqiangzigou-Jiaogaoshan gold,arsenic metallogenic perspective region(?),Wuligou-Gouxionggou gold metallogenic perspective region(?),Dashagou-Langchagou gold metallogenic prospective region(?),and Wajingou-Qieergande gold metallogenic perspective region(?).In these regions,according to the similar metallogenic conditions and the same or related ore deposit genesis types,it delineates three prospecting target areas.(4)In the delineated target region,it found six new mine spots: Langchagoukou northwest gold mine,Gouxionggou gold mine,Wajingou east bifurcation gold mine,Qieergande gold mine,Meiligou east bifurcation gold mine and Meiligou copper mine.The found of the mine spots is verified the analogy method.Using analogy method reduces the uncertainty of the geological exploration prospecting work of the blank area,puts forward more clear and reliable prospecting thought and direction,and makes the selection of exploration methods and means more reasonable.Saving geophysical and geochemical prospecting work improves the efficiency of the exploration,saves the fund and reduces the labor cost.