Au And Polymetallic Metallogenic Conditions And Prospecting Targeting In The Qixinghe Area,Baoqing County,Heilongjiang Province

This area is located in the Jiamusi Lvliang,tungsten,platinum group,copper,zinc,molybdenum,tin and uranium metallogenic belt,Yang Zuo Shan Lao Zuo Shan Lvliang period,the silver deposits and gold metallogenic subzones of the Yangtze River.The geotectonic position is located in the northwest of the Xingkai Lake-bulia mountain massif,the northern part of the Lao Ling massif,the central and southern part of the Jiamusi uplift,and the central part of the Huanan uplift.The area experienced the formation and development of the three tectonic stages and the circum Pacific continental active stage evolution stage,the paleo Asian Ocean continental margin hyperplasia in Jiamusi ancient land,complex geological structure,magmatic activity is very strong,in different periods of strata,intrusive rocks,volcano rocks were exposed,were associated with the very rich in mineral resources.To carry out the metallogenic geological conditions of Qixinghe area analysis and assessment of regional geological prospecting potential,and has important significance to the development and utilization of mineral resources exploration.The Qixing River gold deposit,a typical deposit in the area,is studied.It is found that all the gold deposits occur in the skarn zone of the intrusive rock and marble contact zone.The ore body is mainly controlled by the NW trending fracture in the skarn zone.The main ore types are dipping,fine vein arsenopyrite and pyrite.The main metallic minerals are arsenopyrite,pyrite,pyrrhotite,pyrite,chalcopyrite,galena,sphalerite,trace molybdenite and natural gold.Gangue minerals include diopside,micro plagioclase,garnet,epidote,calcite,quartz,graphite and so on.The study of rock geochemical characteristics shows that the two long granite,granodiorite,diorite and gabbro in the Qixing River gold ore area are calcium alkaline rocks,suggesting that there is a medium high maturity crustal substance in the magma source area of all kinds of rocks.The main elements of the intrusive rocks show that with the increase of SiO₂,the decrease trend of MgO,FeO^T,CaO and TiO₂ shows a significant negative correlation,and a positive correlation with Na₂O.It is suggested that the magmatic rocks in the area may be the products of the same tectonic magmatic system.In the tectonic discrimination diagram,the data points of Cambrian magmatic rocks fall into the same collision volcanic granite,and the Late Palaeozoic Mesozoic Magmatic data points fall into the volcanic arc granite.The ore bodies of the Han onggou iron deposit are layered and stratiform.They are mainly hosted in the Granitite quartz schist and the iron bearing quartzite in the dpangdao formation.The occurrence of the ore body is controlled by strata.The ore is granular and crystalline structure,mainly banded structure.Magnetite is the main mineral type,followed by hematite,limonite,pyrite and pyrrhotite.The deposit is formed because of the sedimentary metamorphic type.Through the study of the metallogenic geological conditions in the region,it is shown that the abundance of the metallogenic elements in the old strata is high,which is the main ore source layer,and the mineralization in the region is mainly controlled by regional magmatism,especially in the late Paleozoic diorite,diorite porphyrite,granite porphyry and quartz vein.Through the geochemical survey of the sediment in the 1:20 million of the working area,the results of geochemical exploration have been synthetically analyzed,and two major comprehensive anomaly detection areas have been delineated.According to the results of 1:2 million soil survey,7 combinations of anomalies were found,of which Ht-15,Ht-40 and Ht-41 anomalies were well integrated and the anomaly intensity was high.On the basis of the study of geological and geochemical characteristics of the deposit,metallogenic prediction is carried out based on geochemical exploration and engineering comprehensive results,and two metallogenic remote scenic spots are delineated,respectively,the gold polymetallic grade II metallogenic far scenic spots in Qixing River and the three ditu Valley,and the far scenic area of the Baishi-Dali-Baishi-III.The direction.