| The region from Xinhure to Baiyunebo-Damaoqi in Central Inner Mongolia is one of the important mineralization belts in north China.Tectonic location is at the northern margin of north China and its northern marginal accretion belt,undergoing many complex geological evolution stages:Archean granite greenstone belt forming stage,Paleoproterozoic epicontinental rifting stage,Neoproterozoic intracontinental rift valley,passive continental margin stage of development,Cambrian-Ordovician marginal activity,Silurian stable epicontinental phase,Paleozoic uplift and denudation,Meso-Cenozoic differential uplift and subsidence.Both of the original revitalizing of continental crust and multiphase cleavage and split the material records formed by Plate system,make this area become a sensitive area and therefore formed many kinds of metal minerals with different genetic types such as gold,iron,copper,rare earth and so on.Based on analysis of the main geological unit element background characteristics,metallogenic elements,and accumulation characteristics of ore-forming indicator element,with study on the element distribution and variation characteristics of the geological units,concluded that multi-element enrichment in the study area should be the combined action of stratum,structure and magmatic rock activity;to some extent,but also reflected the impact trend of regional tectonic activity multi-period to geology and geochemistry.The Great Wall,the Qingbaikou system and the Ordovician strata are the most favorable ore-forming strata of Au element,in the meantime,show that the obviously effect of a later magmatism on gold activation,migration and enrichment;and the magmatism of Paleozoic-Mesozoic plays a prominent role in Au,W activation,migration and enrichment.The Au,W metallogenic coefficient of Ordovician,Silurian and Devonian magmatic rock are higher,reflects the relationship between magmatism and this kind of mineralize is close.Metal ore deposits(point)mainly are polymetallic ore which contain gold,iron,copper,rare earth,lead,zinc,manganese,beryllium and other multi-metals in the study area,the genetic type of the deposits are mostly stratabound hydrothermal type and sedimentary metamorphic type,a few is metasomatic type.Copper and gold deposits are relatively concentrated in the north side of Wlanbulage-Huhetongbu-Yirihe deep fault,which formation is closely associated with adakite,according to the distribution characteristics of the metal ore field and the geological condition.The northwest which from the south of deep fault to Baiyunebo-Shibeng is mainly stratabound hydrothermal type gold deposits,the gold deposits are not only controlled by black shale series in Bierut and Jianshan group of Neoproterozoic Baiyunebo group,and more related to the activities of intermediate acidic magmatic in Hercynian period;while the southeast is mainly sedimentary metamorphic iron ore and greenstone type gold deposits,which are controlled by the Dongwufenzi Group of Seerteng Group in neoarchaeozoic and metamorphic intrusive rocks in late Archean.Analyzing the relationship between the lineament,ring structure,main ore formation information and alteration anomaly information,which extracted through remote sensing,and known orefields,concluded that Baiyunebo group black shale series of gold ore bearing and Wufenzi group of iron ore formation have obvious features,which can serve as indicator for deposits,in remote sensing image map.Deposit with lineament and ring structure has closely relationship,especially,the position,in which the main and secondary lineament intersected and circular structure existed,often has important mineral output or products lots of deposit(point).The place of intersection of lineament with different directions is always the favorable site of tectonic mineralization.Combination of the lineament with itself or circular structure and both sides of the ring structure edge and so on,are the favorable place for mineralization.Alteration anomaly of Remote Sensing which appeared in the mining area or distribution around of deposits,it can be used as one of marks of prospecting,especially the two mineralizing alteration anomaly developing together is an important prospecting mark of remote sensing,but the alteration anomaly area which has a well registration with the known deposits is not the greatest.This paper summarized the working procedure and steps of comprehensive information metallogenic prediction model.According to the regional geological background,geophysical field and geochemical field characteristics of typical deposit as well as geological,geophysical geochemical and remote sensing anomalies characteristics of the mining area,established the comprehensive information prospecting model of Haiyaohudong Au deposits.Saiwusu Au deposits?Gonghudong Cu deposits?Sanheming Fe deposits in the area.Based on the analysis and summarization of minerogenetic,genetic type of the deposits and metallogenic geological condition,in the study area,according to the comprehensive information of geological,geophysical,geochemical,remote sensing and so on,combined with the prediction results of resource potential evaluation,finally confirmed seven metallogenic provinces and pointed out the prospecting direction.In the prospecting process,we must strengthen the study of regional minerogenetic,emphasize the directly prospecting information of earth's surface,to give full play to the comprehensive prospecting method.Particularly,we should pay attention to the effective use of physical,geochemical comprehensive method with 1:50000 and large scale also hyperspectral remote sensing data,and more enhance the work of mineral exploration in the area. |
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