Paper Information

Title: 

GEOCHEMISTRY, MINERALOGY AND ORIGIN OF SAFO MANGANESE DEPOSIT (SOUTHWEST OF MAKO)

Type: PAPER
Author(s): EMAM ALIPOUR A.*
 
 *
 
Name of Seminar: GEOLOGICAL CONGRESS
Type of Seminar:  CONGRESS
Sponsor:  IRANIAN GEOLOGICAL SOCIETY
Date:  2005Volume 9
 
 
Abstract: 

Some manganese and iron-manganese deposits are found within sedimentary pelagic rocks and radiolarian cherts which acompanied with Khoy ophiolite. Most of them have little reserve and only the Safo deposit is the minable one distinguished yet. In Safo deposit, deposition of manganese have been occurred as lense-like orebodies in different horizons within pelagic rocks. This stratiform deposit has syn-sedimentary origin. Mineralogically, pyrolusite, bixibite, braunite and hematite are the main minerals present in ore and Calcite, quartz and barite present as minor phases. The banded, massive and dissaminated textures are seen in orebodies. Geochemical and geological evidences indicate that deposition of ore minerals from submarine hydrothermal solutions have been occurred on the abyssal plain of neothetian oceanic basin in upper cretaceous. The Mn/Fe ratio in the ore is highly variable and ranges from 1,35 to 31,7. The mean Mn/Fe ratio (8) is about an order of magnitude higher than that of metalliferous sediments from mid-oceans .The high raio of Mn/Fe and Si/Al, very low content of trace metals specially Co, Ni and Cu, low content of Y and Ce; and high content of SiO2, Mn, Fe, Ba and Sr are evidences 0 f Mn enrichment of hydrothermal fluids (exalatives) and contribution of hydrogenetic processes in formation of this deposit is insignificant .The study of correlation coefficients between different companents and elements show that there was not any relationships between Cu, Co and Ni metals with hydrothermal solutions rich in silica, manganese and iron.

 
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