Explanatory report of 1:1000 geology map of Zirvaght Manganese deposit
This report is a description of explorational activity in the Khur & Zirvaght manganese deposit done under a contract by Kankavan Consulting Engineers for preparing topography and geology maps on the scale 1:1000. The report contains the geology of Taknar block, Khur and Zirvaght area, the Zirvaght deposit and structural geology of deposit and its genesis.
The deposit is located 35 Km away from the NE of Bardskan in the Khorasan Province. Lithology of the area includes metamorphic, igneous and sedimentary rocks from Precambrian to Holocene. Kashmar ophiolite makes a narrow belt in the region. Manganese lenses, veins and nodules exist in the ophiolite belt, associated with limestone and radiolarite. Source of manganese is marine volcanism followed by hydrothermal processes and tectonic activities. Concentration of economic manganese lenses has occurred by hydrothermal circulation in the crushed zones. Flow of solutions into radiolarite and limestone along fault zones was led to ionic exchange with limestone. The manganese lenses are post-Eocene in age.
Hydrothermal activity may be started after last granitic phase of Eocene. Granitic rocks formed by melting of continental crust are widespread in the ophiolite complex.