Study of Barite Ore Genesis of Komsheche with Usage ofGeochemistry Data

Category Economic geology & mineral exploration
Group GSI.IR
Location 21th symposium on geosciences
Holding Date 21 May 2008

      The Komshecheh barite mine is located in northeast of EsfahanCity. Structurally, this region belongs to Central Iranian zone. Lower Triassic shale ? sandstone unit and a granodioritic intrusive body in the northeast of the mine may be important in barite mineralization. The obtained data on REE distribution in ore and intrusive body samples indicate that the distribution curves have similar slops (except for Eu2+). REE concentration in ore samples has been decreased relative to granodiorite ones. The obtained chemical data along with sulfur isotopic data on barite samples show that connate water is the source of mineralizing fluid. The mixing of at least two fluids in different stages has occurred during mineralization in Komshecheh. The compaction of shale (with 220 ppm Ba) leads to extraction of basal brine fluid, and then the fluid is warm and circulates by intrusive body. The mixing of the fluid with connate water, which contains heavy sulfate, leads to barite deposition in a suitable location.