Ore control factors and genesis of the Shabaosi gold deposit, North Daxing' anling

The Shabaosi gold deposit occurs in Middle Jurassic land facies clastic rocks.There are 6 ore veins with nearly SN trend in the deposit. The formation of the ore deposit has gone through 4 ore forming periods and 6 ore forming stages. The mainly ore types are the altered sandstone type and the tectonoclastic altered rock type. The ore bodies are strictly controlled by SN and NNW trend fault and the wall rocks and the intrusive rocks are involved in the mineralization.Based on the analysis of Pb,S,H and O isotopes and the study of mineralization temperature of the gold deposit,it is found that the metallogenic elements are from the deep magmas and strata,the mineralization liquor are mixed by magmatic hydrothermal and atmospheric water,the temperature of mineralization is at 200～230 ℃,the genetic type belongs to the meso epithermal altered sandstone one.