Abstract
AbstractTheSorkhe‐Dizaj iron oxide–apatite deposit in theCenozoicAlborz‐Azarbaijan magmatic belt,NW Iran, is hosted mainly by aLateEocene toOligocene quartz‐monzonitic body, and subordinately in theEocene volcanic and volcanoclastic sequences. TheSorkhe‐Dizaj intrusive body is anI‐type granitoid of the calc‐alkaline series. Mineralization is associated with actinolization,K‐feldspar, sericitic, propylitic, and tourmaline alteration types. The orebodies are massive, banded, stockwork, and breccia in shape and occur mainly along the fault zones within the quartz‐monzonitic intrusion, volcanic, and volcanoclastic rocks. Ore minerals dominantly comprise magnetite, apatite, and monazite, as well as minor amounts of chalcopyrite, bornite, and pyrite. Four major paragenetic stages are discriminated in the mineralization including early, oxide, sulfide, and late stage. TheSorkhe‐Dizaj deposit is similar in the aspects of host rock lithology, alteration, and mineralogy to theKiruna‐type deposits associated with minorCusulfide minerals. Spatial and temporal association of the mineralization with theLateEocene–EarlyOligocene quartz‐monzonite intrusive body suggests that the ore fluid was probably related to magmatic activity.
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