Investigating genesis of the Tuzlar gold occurrences

Category Environmetal Geology
Group GSI.IR
Location 23th symposium on geosciences
Holding Date 05 May 2008

      The studied area located at 35 km northwest of Mahneshan in Zanjan province and in 1/100000 geological map of Takhte- Suleiman. In this quadrangle there are many hot springs and epithermal signs that are related to Tertiary volcanism. Based on studies this
   Region is an epithermal one that is related to Oligomiocene volcanism. Form of deposit is vein-shaped with silica veins. Silica veins have milky and grey colors that surrounded by argillic alteration. Opaque minerals include: chalcopyrite? chalcosite? covellite? pyrite?leucoxene and Fe oxides. Gangue minerals are quartz and barite. Trend of the veins follows structural trends and divided into two groups: NW-SE and NE-SW veins that have been created later. Mineralization follows these trends and is related to NE-SW veins. Maximum amount of gold in the samples is 12/1 ppm and average is 384 ppb. The richest samples are related to argillic alteration that this may be because of effect of acidic solutions. Totally this occurrence is an acid-sulfate epithermal.

tags: ZANJAN