ANALYSIS OF ORE CONTROLLING FACTORS OF HUANGTULIANG GOLD DEPOSIT, NORTHWEST HEBEI PROVINCE

Huangtuliang gold deposit,Chicheng county, Hebei province,occurs in the inner contact zone of Shuiquangou-Dananshan alkali monzonite complex. The regional strata include Archaeozoic Jiangouhe formation,Hercynian syenite and earlier Yanshanian granite Subsequent faults F₁ and F₄, derived from Shangyi-Chicheng deep fracture, are the dominated ore-controlling structure. The deposit is characterized by its wide mineralization zone,great scale,simple composition,low sulfur,single alteration,simple type of ore,even gold content,shallow occurrence and easiness for mining and dressing Abundant-gold-bearing. Hercynian syenite is the dominated mineral source rock of the deposit,meanwhile,Archaeozoic Jiangouhe formation provides parts of mineral source for the deposit. Potassium zone in the syenite offers the ore-forming space. The gold deposit was formed in 189 Ma and close related to Yanshanian granite. The regional compress-shear faults F1 and F4,and the concentrated subsequent fractures are dominated ore-guiding and ore-forming structure,which decided the shape and occurrence of ore bodies. K-rich alkali magmatic motion is the dominated magma motion in the region,which can be concluded from the chemical compositions of magmatic rock and its inclusions. It also matches with the extensive potassium which is available to form gold deposit. The regional ore-forming minerals and media sources have close relation to magmatic and matamorphic rocks,which is concluded from characters of lead,hydrogen,oxygen isotopes and rare elements. From above all,it is concluded that Huangtuliang gold deposit is a moderate hydrothermal deposit,which is controlled by potashed syenite zone and the subsequent structures,and has close relation to Hercynian-earlier Yanshanian K-rich alkali magma motion.