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Ghasem Nabatian, Department of Geology (Islamic Republic of Iran)
Majid Ghaderi, Department of Geology (Islamic Republic of Iran)
Nematollah Rashidnejad-Omran, Department of Geology (Islamic Republic of Iran)
Farahnaz Daliran, Geological Institute (Germany)
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Sorkheh-Dizaj apatite-magnetite deposit is located in northwest Iran, southeast of Zanjan within the Cenozoic of Tarom volcano-plutonic belt. This belt with NW-SE trend was formed during Cenozoic Azarbaijan-west Alborz magmatism.
The iron oxide ore is hosted by the Eocene andesitic tuffs (Karaj Formation) and by granitoid rocks (granodiorite, quartz-monzonite, monzonite, granite) that here intruded the andesites. The andesitic rocks formed in island arc environments and the granitoids are I type and belong to the calc-alkaline magmatic series synorogenic to postorogenic.
Iron oxide ore mineralization at Sorkheh-Dizaj comprises magnetite, apatite, monazite, chalcopyrite, bornite, and pyrite. Magnetite is low in Ti and V (< 1-2) contains occasionally ilmenite and spinel exsolution.
Iron oxide ore occurs as irregular vein and veinlets of magnetite, apatite-magnetite stockwork, banded apatite-magnetite, massive apatite-magnetite, and sulfide veinlets.
The characteristic alteration suite associated with the mineralization includes silicification, actinolitization, K-feldspar metasomatism, scapolite and chlorite. Iron oxide mineralization at Sorkheh-Dizaj is probably related to the intrusion of granitoid rocks and can be classified as a hydrothermal Iron Oxide Copper Gold (IOCG) deposit.
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