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Paper Information

Title: 

IRON OXIDES CU-AU DEPOSITS (IOCG) AND EXAMPLES FROM IRAN

Type: PAPER
Author(s): KARIMPOUR M.H.*
 
 *DEPARTMENT OF GEOLOGY, FERDOWSI UNIVERSITY OF MASHHAD
 
Name of Seminar: GEOLOGICAL CONGRESS
Type of Seminar:  CONGRESS
Sponsor:  IRANIAN GEOLOGICAL SOCIETY
Date:  2005Volume 9
 
 
Abstract: 

The Iron oxides deposits are divided into two groups: the Iron oxide Cu-Au Deposits (IOCG) and the magnetite-apatite type. They are classified into subdivision by the writer of this article into (1) magnetite, magnetite-apatite and magnetite-REE. (2) The IOCG: Magnetite-Cu-U-REE, magnetite- Cu-Au, specularite-Cu-Au, and specularite Au. The source rocks for the (IOCG) deposits are the oxidant calcalkaline to alkaline diorite – gabbro - granodiorite. The magma was originated in the area of subduction zone or rift setting. Tectonic settings control the type of magma and the fluid chemistry. The IOCG deposits which are formed in the area of continental rifting usually contain La, U, Ce, P and REE but not in subduction zone. IOCG deposits can be classified in two groups: 1- magnetite rich and 2–specularite rich. Magnetite rich type form close to the source rock and the Cu grade is medium to high and Au content is medium to low. Specularite-rich type formed far from the source rock and they contain high Au and in some case Cu can be economical. Alteration type also is being controlled by the fluid chemistry. Sodic, potassic, carbonate, chlorite, and sericite alteration are common. Base on Barton and others theory, the ore bearing fluid are saline rich type (NaCl > %25) and halite is being leached from the sedimentary rocks. Fluid inclusion studied from Qaleh Zari Cu–Au deposit and Kuh Zar Au–Cu prospecting area indicate that the NaCl of the ore fluid was<%6 percent. The magmatic fluid mixed with the meteoric water and as result the salinity decreased. This indicates that the fluid does not need to be saline rich and the source of halite is magmatic rather than sedimentary. Based on the result of exploration which is being carried on volcanic-plutonic belt of Khaf-Kashmar-Bardaskan during the last 5 years some new IOCG deposits have been discovered. Kuh Zar (Torbet-Hydarieh) prospecting area is Specularite rich Au-Cu deposit. It carries more than 30 percent Specularite, minor sulfide, and the average gold grade is 6,5ppm. Sangan Magnetite deposit is also situated along this belt, therefore this belt has great potential to explore for both IOCG and magnetite type deposits. Qaleh zari is a specularite rich Cu-Au-Ag deposit. Sign of IOCG mineralization are noticed in Lut Blook.

 
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