| Since Archaeozoic era in Heilongjiang Province,the strata are developed complete,magmatic hydrothermal activities are frequent,geological structures are developed,ore-forming conditions and prospecting potential are huge.However,due to the lack of research on structural ore-controlling,ore-forming conditions,mineralization and enrichment rules and ore-forming prediction,leading to the region as a whole progress of prospecting is slow.Therefore,it is of great practical significance to strengthen the study of mineralization and enrichment law and ore-forming prediction in the study area and its adjacent areas.By taking part in the general survey project of molybdenum polymetallic deposit in Chao Man Forest Farm of Mohe County,Heilongjiang Province,the author made a comprehensive study and analysis of the geological work in the field and the previous geological data,and made a conclusion.Combined with the related theoretical knowledge of petrology,mineralogy,geochemistry and geophysics,study and analysis of regional geological structure,lithology of strata and intrusive rocks,mineralized alteration and molybdenum-metal sulphide formation in the region.In order to enrich and develop the theoretical study of ore-forming prediction in this area,the prospect of ore-prospecting has been summarized.This work mainly uses 1: 20 000 soil geochemical measurements,1: 20 000 high precision magnetic survey,1: 20 000 induced polarization middle ladder survey,1: 20000 induced polarization sounding profile survey and grooving,drilling and other technical methods are used.The ore-forming geological background and ore-controlling factors,distribution law of ore body,alteration zone of mineralization,distribution range,scale of mineralization,mineral composition,enrichment law of molybdenum mineralization and so on,are summarized and studied in this paper.Combined with the geophysical and geochemical data and the field geological work,the ore-forming geological background is integrated and the ore-forming favorable parts are predicted.The following results and awareness have been achieved:(1)The ore bodies seen in the area have obvious spatial distribution laws.The ore bodies are mineralized from shallow to deep ore into Ag(CuPb)-Mo polymetallic,From the center to the periphery followed by Mo(Cu)-AgPbZn and AgCu mineralization.It is characterized by the transition of hydrothermal filled Ag polymetallic mineralization type centered on porphyry low-grade Mo(Cu)mineralization.(2)Silication-carbonate mineralization,pyritization-brass mineralization combination is beneficial to mineralization.The positive magnetic field anomaly,local gravity high anomaly,middle and low resistivity,middle and high polarizability anomaly are the favorable areas for the exploration of molybdenum deposits.Geochemical anomalies indicate that the comprehensive anomalies of copper,zinc,silver,tungsten and molybdenum five elements are of good indication for the exploration of molybdenum deposits.(3)The ore-forming geological conditions in this area are superior,and the ore-prospecting results in recent years also show that it is a favorable area for searching for silver-lead-copper-molybdenum deposits,with various metallogenic types and great prospecting prospects and prospecting potential.Finally,through comprehensive analysis of geological characteristics,geophysical anomalies,geochemical anomalies,metallogenic conditions,alteration types of ore body wall rocks,and enrichment rules of molybdenum mineralization in the study area,two key prospecting targets are delineated in order to find porphyry molybdenum-copper deposits and other types of silver-lead deposits. |
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