Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Mineralogy and Ore genesis of Bayche – Bagh Five Elemen (Ag- Ni-Co-As-Bi) Vein Deposit (NW Zanjan, Iran)

Document Type : Original Research Paper

Authors
Mohammad Lotfi 1, 2
Mehrdad Karimi 3
1 Research Institute for Earth Sciences (GSI), Tehran, Iran
2 North Tehran branch, Islamic Azad University, Tehran, Iran
3 Islamic Azad university, Researches and Sciences Campus , Tehran, Iran
Abstract
The Bayche – Bagh mine area in the northern part of  Takab based on lithostratigraphy point of  view includes gneisses  and amphibolites of  Precambrian, which are unconformably overlain by volcanic – volcanoclastic and associated  sedimentary rock units of  Tertiary and Quaternary age. The  volcanic rocks are divided  into rhyolitic and andesitic groups  in which the rholitic group provides  the main host – rock of  the deposit. Ore parageneses include copper, lead, zinc, nickel,  cobalt  and  Bismuth  mineral occurred in nine veins of main  orders and  few  veinlets.
The physico chemical conditions of ore – fluids governing the ore – mineralization, were controlled by fluid inclusion studies and the  related obtained parameters are as follows:
 - Temperature of  homogenization (TH) from 212ºC to 470ºC
 - Salinity (in NaCl-equivalent  percent) about 25%
 -Trapping pressure from 50 to 800 bars
The ore-generation processes based on the nature of magmatic host rocks, ore  assemblages and thermometric data in the Bayche-Bagh deposit, similar to other hydrothermal five – element vein deposits, seem to be occurred in relation to ore recycling and fluid migrations. These fluids  the metals of recycled the deep-seated basic and ultrabasic rocks of the old basement as also  adjacent volcanoclastic hosts and deposited the ore minerals in the fault spaces in under suitable conditions.
Keywords
Bayche Bagh ore deposit
temperature of homogenization
salinity
trapping pressure
Five element vein deposits
Ore – recycling
Fluid migration

Subjects

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Scientific Quarterly Journal of Geosciences
Volume 14, Issue 53
Autumn 2004, Vol. 14, No. 53
Autumn 2004
Pages 40-55