Evaluation of alteration zones in choghart iron ore deposit (Bafg Area, Central Iran)

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Research Paper 01/02/2015
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Evaluation of alteration zones in choghart iron ore deposit (Bafg Area, Central Iran)

Zohreh Hossein Mirzaei Beni, M. H. Emami, S. J. Sheikhzakariaee, A. Nasr Esfahani
J. Bio. Env. Sci.6( 2), 447-454, February 2015.
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Abstract

The Choghart iron ore deposit is located 12 km northeast of Bafq and 125 km southeast of Yazd. The Choghart iron oxide-apatite is placed within felsic volcanic tuffs, rhyolite rocks and volcanic-sedimentary sections belonging to the lower Cambrian period. Sodic alteration is one of the most comprehensive alterations in this mine. The main minerals in this zone are magnetite, hematite, secondary albite (checkers albite), apatite, calcite and amphibole. Other alterations in this deposit are calcic, silica and low temperature alterations. Calcic alteration specified with presence of magnetite and amphibole minerals (major minerals), feldspar and apatite (minor minerals) and hematite. Sodic and calcic alterations are associated with mineralization and silica and low temperature alterations have little relevance with mineralization. Low temperature alterations are the final step of alterations and hematite, martyt, chlorite, epidote, sericite and calcite formed in this stage. There is a limited sulphide phase in Choghart deposit. Pyrite is the most important sulfide phase in all of alterations which can be seen in the scattered shape and with magnetite that represents the next hydrothermal activities. P content is low in all of alterations but its content in sodic alteration is lower than other alterations.

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