Hydrothermal Alteration in Ramand Region

Our study area as a part of magmatic belt of Urmieh-Dokhtar region is located in the South West of Buin-Zahra among structural zones of central Iran. Approximately distance from provincial capital is about 60 Kilometers. The main geological occurrences are known as igneous and pyroclastics formations such as rhyodacite and rhyolithic tuffs. In this region, extended alterations have been detected by remote sensing techniques. Also these features may be observed due to field activities in volcanic regions. In this research, enhancement of alteration facies has been well done by remotely sensed ETM databases after applying a selective principle component analysis according to Crosta techniques. Advanced Silicification haloes are most important evidence indicate to Base and Precious metals potentials in postmagmatic environments. For identifying the Silica content and related variations in epithermal systems, Crosta technique is adequate. This method introduces to recognition some clay and iron-oxides combinations as the main part of hydrothermal alterations in prospected regions. Concluded photomaps of which signals have been improved by mathematical analysis contained number of unique digital numbers related to epithermal mineralization processes in ramand subregion, Qazvin province, Iran.

Keywords:

Remote sensing , Crosta technique , silicic alteration , Ramand