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Volcanogenic Massive Sulfide Cu-ag Mineralization In The Kharturan Area, Southeast Of Shahrood

Volcanogenic massive sulfide (VMS) mineralization in the Kharturan area, 290km southeast of Shahrood, Iran, occurred within the Late Cretaceous volcano- sedimentary sequence in the Sabzevar subzone of Central East Iranian Microcontinent. Main VMS deposits in the area are the Garmabe Paein and Asbkeshan deposits. The mineralization occurred as stratiform and stratabound orebodies within a specific stratigraphic horizon. The host rocks are andesitic volcanic rocks and the related volcaniclastics. The orebodies from footwall to hanging wall involve four ore facies: vein-veinlets (stringer), massive, bedded and exhalative sediments (exhalite). Minerlogically, the deposits contain primary pyrite, native copper, chalcopyrite and magnetite, and secondary cuprite, covellite, malachite and Fe-Mn oxidies. Textures and structures of ores involve massive, semi-massive, laminated, banded, vein-veinlets, replacement and open space-fillings. Wallrock alterations are dominated by chloritic and argillic.