Geology and Geochemistry of Cu Mineralization in the Dehmadan and Darreh-Yas indices, Charmahal va Bakhtiari Province

Authors

1 Department of Geology, Faculty of Earth Sciences, Shahid Chamran University of Ahvaz, Ahvaz, Iran

2 Research Institute for Earth Sciences, Geological Survey and Mineral Exploration of Iran, Tehran, Iran

Abstract

Mashayekh area is located in Charmahal and Bakhtiari province and is structurally located in the high Zagros belt. This region is characterized by two mining districts, namely, the Dehmadan and the Darreh-Yas, approximately two kilometers apart. The most mineralization is associated with organic-bearing carbonate rocks in the Dehmadan deposit. The presence of Do-ab salt dome and Ab-Vanak reverse fault in around of the study area have been resulted in changing the salinity, Eh, pH and movement of ore forming fluids. The geochemical results represent negative Ce and Eu anomalies, Light Rare Earth elements (LREE) enrichment relative to Heavy Rare Earth Elements (HREE) in the Dehmadan deposit that the features are analogous to that of central African Zambian belt sedimentary copper deposits. Darreh-Yas deposit also shows weak negative Ce anomaly and HREE enrichment relative to LREE. In general, the results indicate that metals of old units have been leached by high saline brines with oxic conditions and entered into sedimentary basins. Then, the reaction of ore-forming fluid with organic-bearing carbonate rocks lead to ore deposition in a reduced condition. Finally, the ore has been undergone by late-stage supergene and weathering processes.

Keywords

References

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Advanced Applied Geology
Volume 10, Issue 1
April 2020
Pages 60-77

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