Writers : Ghoorchi, Maliheh; Abbasnia,Hossein
Refference : The first international applied geological congress; Department of geology Islamic azad university- Mashhad
Publishing Year : 2010

Abstract :

The Firoozkuh mineralized area occurs in Khorasan Razavi province, in north eastern Iran .Gold mineralization related to a sulphide-bearing quartz vein has been identified in some plutonic rocks adjust siltstone and shale. Petrographically, the rocks range from Quartz diorite to gabbro diorite. Siltstone, shale changed to hornfels near mineralization zones. Mineralization is locally dominantly fracture-controlled. Quartz veins ranging from a few millimeters to maximum 50cm in thickness occur in a fault zone. Calcite veins have less mineralization and alteration evidence. The vein-hosted mineral assemblage includes principally pyrite, chalcopyrite and arsenopyrite which almost presence together in silica veins. Main mineralization assemblage containing Au, As, Cu, Bi, Mo and Ag show that mineralization has occurred in high temperature condition. The difference in temperature between the cool country rocks and the hot invading fluids causes reactions which results in a new assemblage of minerals. The main products of this mineralization are chlorite, sericite, zeolites, clays, silica and pyrite. Propylitization is the main zone of alteration in which chlorite is the main mineral. Silica, chlorite, sericite and pyrite of the alteration halos are usually restricted to mineralized zones.

Subject List : gold