Visibility Hydrothermal alteration holes Babavali (Guilan) by applying logical operators pictures Aster

The study area is part of the Alborz Mountains and the western part of the Central Alborz Zone Aster image processing have been used for mapping hydrothermal alteration zones in studied area. We have combinated hybrid algorithm of banding and false color with logical operators and thereshold setting that have been based on field, Laboratory and experimental studies. In this paper we present algorithm of logical operators mapping that was distinguished by propylation alteration of Calcite and Epidote– Chlorite minerals which was confirmed by the results of alterations. Separate altered zones by using the bandeag ratio method. Detect hydrothermal alteration (Argilic and Flick) according to the sampling and field observations results.