METALLOGENIC GEOLOGY OF JIANGDONGWANGOLD ANTIMONY DEPOSIT IN HUNAN PROVINCE

The Jiangdongwan gold-antimony deposit,located in the southwestern section of the Xuefengshan arcuate metallogenic belt,is contained in the secondary fracture zone of an anticlinorium,which is bounded and uplifted by two NE-trending regional faults.Strata and structures control the deposit,which belongs to sedimentary-mixed hydrothermal filling and metasomatic type.The ore-forming substances is derived from the mixture of sedimentary rocks with hot-brine water,metamorphic water and magmatic water.The Mobin formation of Gaojian group is the ore-hosting horizon and source bed,which is consisted of silt slate,sericite slate and metamorphic fine sandstone or siltstone rich in pyroclastic substances.The silt slate and metamorphic fine sandstone/siltstone are relatively fragile and tend to produce fissures,thus they can supply with reservoir spaces.While the sericite slate is more plastic with less fissure,so that it is easy to form a seal environment for mineralization.The contents of ore-forming elements in the strata respectively are:Au 200×10^-9,Sb 10×10^-6 and As 200×10^-6.The studies on the metallogenic geology,ore-controlling factors and mineralization model of the deposit show a multi sourced ore forming material,multistage mineralizing process and multi-type of controlling structures.