Abstract:

Zhaishang gold deposit exposes middle Devonian and lower Permian，the former divide into four lithologic segments and the latter divide into two lithologic segments.North ore belt distribute in the first lithologic segment of lower Permian，north wing of anticline,and south ore belt distribute in the first lithologic segment of middle Devonian,core of anticline.The formation and distribution of ore veins are controlled by lithologic differences，ore veins produce in the contact interface of soft and hard rock，the vein occurrence has obvious inheritance with wall rock.Structure is composition of anticline,main fault and contain ore fault.Zhamashu anticline has the characteristics of north thin，slow and north wing normal,and south thick，steep and south wing reverse，NW trend，turn west to nearly EW，show“S” shape.The main fault and contain ore fault are controlled by anticline，formation with the secondary deformation of anticline.ore veins clamp between the main fault，and distribute in the focus area of transition stress of north and south sides of anticline，and it is controlled by stratum，anticline and fault jointly.

Key words: Zhaishang gold deposit, Stratum, Fault, Anticline, Ore-controlling factors, Gansu Province