Evaluation of the controlling factors in the fluorite vein mineralization in the NW Sanandaj-Sirjan Zone

In this research the impact of structural controlling factors in the fluorite mineralization was evaluated, north west of the Sanandaj-Sirjan metamorphic zone. The structural and microstructural analysis indicated the major structure in the Bagher Abad region is fold related structures and shear fractures that cut the fold axes are the host for fluorite mineralization. In the Qahr-Abad area, fluorite deposits are reverse fault-related. Satellite image analysis with band ratio, PCA, and SAM techniques revealed the hydrothermal fluid circulation in the host rock caused the propagation of propylitic and phyllic alterations in the BA region whereas phyllic and argillic alteration in the QA region is dominated. The fluid inclusions micro-thermometry indicated in the BA region, mineralization occurred in the shallow depth approximately at 30 meters and low temperature 50-100 Cº. In the QA region, mineralization takes place in the 150-200 meters and higher tempreture. Analysis of salinity of the fluid inclusion shows in the BA region, mixing of meteoric water with hydrothermal fluid and Dissolution of host rock increase the salinity percent of fluid inclusion.