Research On Prospecting Prediction Of Gold Polymetallic Deposit Of Western Qinling Area Based On Information Value Method Of DPIS System

Located in the peripheral Gong-he basin of Qinghai province,west Qinling area is the transition zone of central orogenic belt of west Qinling,east Kunlun and their adjacent blocks.The area is an important locality of nonferrous and precious metal of Qinghai province,which has experienced complicated tectonic movements since Precambrian.Neopaleozoic-Mesozoic was an important period of ocean-land transition,plate collision and intracontinental orogeny,under the background of orogenic movement during the period,the intense tectonic-magmatic activity of Indosinian was taken place and various types of sedimentary formation were formed,which have contributed to the special metal metallogenic conditions of west Qingling area.A series of important prospecting progress has been made through years of geological exploration,however,the area still has a great prospecting potential as the research degree is limited.A location prediction of ore deposits DPIS method of information system for deep mining area,the metallogenetic prediction of edge,for the western Qinling gold polymetallic mineral prediction area in Qinghai province and the found of the target and evaluation provides a new basis.Based on the national large database,the GIS technology has adopted in this paper to pre-process a large amount of multi-source spital data of the study area and to accomplish the update and merge work of geological data.On this basis,the multi-source spatial information database has been established.Gold polymetallic minerals prospecting prediction was based on information value method of secondary development software DPIS system,the method is accrording to different types of optimizing ore-prospecting criteria,including:strata,magmatic rocks,geochemical exploration and fracture structure,etc.,The research proceeds in accordance with the prediction process of generate the cell,statistic the flag state,and calculate the information.According to the method of information theory,the calculation of each kind of status sign indicates a mine of information,and then sort information of the flag state,and select the useful ore-prospecting criteria state,calculate the amount of useful information on each cell according to the amount of information table generated color piece figure and contour map information.According to the processing and statictical results of DPIS system,combined with regional geological conditions,ore-controlling factors and research achievements about gold polymetallic metallogenic regularities and the distribution characteristics of main ore deposits(points),12 prospecting prediction area and three prospecting target areas are delineated.