Writers : Saboori, S.; Karimpour, M. H.; Heydarian Shahri, M. R.; Javidi Moghadam, M.
Refference : 1st Symposium of Iranian Society of Economic Geology
Publishing Year : 1389

Abstract :

Kolah Aboozar Iron prospecting aea is located 90 km southeast of Mashhad. Sedimentary units included limestone (lower creteseaus) and sandstone (Ealy tertiary). Subvolcanic diorite and hornblende diorite (Oligo-Miocene) intruded these limestone and sandstone. Investigated alteration of area show that carbonatic alteration, sillicifed zones and mixture of them. Carbonatic alteration is abservated as calcic veinlets in form of stockwork and musaic texture in the matrix. Sillicifed alteration is presented as vein and veinlet insuburbs of mineralized lentiforms and stones are located deposit. Mineralization of area is happened during two stages which they are hydrothermal and supergene. Magnetite and pyrite minerals are formed in hydrothermal stage. The deployment of alteration and supergene mineralization and also the presence of sulfidation minerals are invented by the abundant fractures. The main mineralization during this stage involve goethite, hematite and limonite. Geochemical studies are doing on the stones samples, and they analysised for concentration of Fe, Mg, Ca and Mn elements using Atomic absorbtion spectrometric (AAS) method. According to the result of analysis maximum amount Fe is 31.9 percent. Fe anomaly is followed with increase of Mn and it is conformed to goethite and hematite limeston in trench. The amount of Ca is decreased during increase of Fe and Mn in deposit. The field abservation and mineralography studies in altered and mineralized zones indicated that mineralization is hydrothermal. Sulfiedation minerals are changed to oxidation deposite by supergene and oxidation process.

Subject List : Iron