Geological Characteristics And Prospecting Direction Of The Changshengqu Gold Deposit In The Guyang County,Inner Mongolia

The Changsheng gold deposit is located in metallogenic subzone of wulashan-daqingshan in Inner Mongolia which has great gold prospecting potential in the gold,silver,iron and ore-prospecting potential.On the basis of extensive collection of regional geological data and through detailed field geological exploration,the metallogenic geological features,material sources and genesis of the Changsheng gold deposit are discussed with the guidance of the theory of petrology,ore deposits,geochemistry and isotopic geochemistry,and the prospecting marks are summed up and the final confirmation is made.The next step is to find the direction of the prospecting.The ore bearing strata are mainly in the gneiss group of the urahan group of the Archean,and the gold mineralization is strictly controlled by the structure.The ore bodies occur in the secondary structure of the urahan Mount Daqing EW tectonic zone,mainly in the direction of NW direction and SN direction;the magmatic activity in the area is frequent,the intrusive rocks develop,and the intrusion of rock mass in the period of the varisi period and the Yanshan period.The ore bodies occur in the altered granite,gneiss,diagonal gneiss,marble,mixed rock and quartz veins in the uraoshan group of the middle Archean,which are strictly controlled by the EW tectonic zone and secondary structure of the urahan Mount Daqing.The gold bearing geological bodies are mainly gold bearing quartz veins and gold bearing altered rocks.The wall rock alteration has silicification,mylonitization,green mud petrochemistry,kaolinization,black cloud mother,sericite,epidote,sub flicker,carbonation,potassium and so on.The zonation of the alteration zone is more obvious,and the alteration intensity from the vein to the surrounding rock in turn decreases,and the element content in the altered rock also decreases in turn.The results of hydrogen and oxygen isotopes show that the?¹⁸O value of the quartz vein in the mineralization stage is 10.0‰¹2.1‰,the estimated fluid?¹⁸O_H2O value is 5.3‰⁶.93‰,and the?D value is-84‰^-74‰.It is considered that the ore-forming fluid of Changsheng gold deposit is mainly a mixture of magmatic hydrothermal fluid and atmospheric precipitation?groundwater?.Based on the study of sulfur isotopes in the same type of ore deposits,it is considered that the source of sulfur in the Changsheng gold deposit is mainly the crust.The results of the inclusions show that the average temperature range of the inclusions at the main metallogenic stage is 344⁴06?,averaging 366?,and the salinity is1.79³.42%NaCl and average 2.56%NaCl,and the density is 0.32⁰.60g/cm³,0.48g/cm³.It is indicated that the metallogenic hydrothermal solution is characterized by medium high temperature,low salinity and low density,and belongs to the H₂O-NaCl-CO₂ system.It is estimated that the ore forming pressure is153²21MPa and the metallogenic depth is 10.34¹2.32km.Through the study of the relationship between the distribution of ore bodies and intrusive rocks in the mining area,and combining with the dating data of the regional intrusive bodies,it is conjectured that the mineralization age of the Changsheng gold deposit may be in the late Yanshan,and the genesis type of the Changsheng gold deposit is that it is strictly controlled by the structure and the medium to high temperature hydrothermal alteration rock type participated by the underground brine water.Deposit.On the region,the gneiss group of the uran mountain group is the main gold bearing stratum,the turning point of the Linhe Jining east-west fault zone and the intersection of the secondary faults in different directions are the favorable places for gold precipitation and enrichment,and the intrusion of the Permian Jurassic acid magmatic rocks provides the thermal energy and kinetic energy for gold mineralization.The strong area of mixing is favorable for the formation of gold mineralization.Silicification,potassic feldspar,mylonitization,chlorite and other wall rock alteration are closely related to gold mineralization.The gold abnormal halo in class A and class B anomalies in 1:5 0000 geochemical survey is a good ore finding sign.In the mining area,the tectonic breakage zone of north-west and North-South structures and sulfide quartz veins are the direct ore prospecting marks,and the old ground and old mining points are also important prospecting lines,and the focus of the AS20 B 2 anomaly area in the west of the mining area is the key point.The prospecting mark.Through the comprehensive analysis of metallogenic geological conditions and geophysical and geochemical exploration results of the mining area,the prospecting direction of this area is determined.Due to the favorable metallogenic conditions of the Changsheng gold deposit formation,the frequent magmatic rocks and the trinity of the tectonic ore control?ore deposit?,the original exploration degree of the mining area is low,the blind ore bodies are many,and many of the orebodies are not trapped.Fact.It is believed that the extension and extension of the orebody and blind ore body and the northwest part of the mining area should be the focus of the next work.