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  Preliminary exploration project of the Khur and Zirvaght manganese deposits (Central Khorasan) The Report of 1:5000 geology map Hossein Qotbi Kankaran Consulting Engineers 1992-93
Khur and Zirvaght manganese
Preliminary exploration project of the Khur and Zirvaght manganese deposits (Central Khorasan)
 
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   Preliminary exploration project of the Khur and Zirvaght manganese deposits (Central Khorasan)
   The Report of 1:5000 geology map
  
   Abstract
   At north of the Taknar fault in the Khorasan Province, in the Khur and Zirvaght areas, oldest exposed volcano-sedimentary rocks are followed by the lower Cretaceous limestones and Paleocene conglomerate. These rock units are laid upon the younger units along the fault. An ophiolitic complex belonging to the Sabzevar ophiolite trend includes these units:
   1- intensely serpentinized periodotite with diabasic and andesitic dykes
   2- basic to intermediate marine volcanic rocks of upper Cretaceous containing pillow basalts, spilite, andesite, and rhyodacite
   3- radiolarite, pillow basalt and pelagic limestone
  
   Tertiary deposits occur as conglomerate and conglomeratic limestone with nummulite fossils. Tuff, green tuff breccia and volcanic rocks are following the former limestone. Toward east, this unit finds a flysch facies with little evaporate.
   Last magmatic activity in the area includes sub-volcanic intermediate intrusions. Manganese has occurred due to marine volcanism of the Late Cretaceous as discontinuous lenses in the Khur and Zirvaght areas. Numerous faults caused the rupturing and fragmentation of ore bearing lenses.
 
 
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