TITLE:
Evaluation of Structural Patterns and Related Alteration and Mineralization Zones by Using ASAR-ASTER Imagery in Siyahrood Area (East Azarbaijan—NW Iran)
AUTHORS:
Shabnam Khosroshahizadeh, Mohsen Pourkermani, Mahmood Almasiyan, Mehran Arian, Ahmad Khakzad
KEYWORDS:
Siyahrood Area, ASTER Image, Lineaments, Directional Filter, Iran
JOURNAL NAME:
Open Journal of Geology,
Vol.5 No.9,
September
9,
2015
ABSTRACT: The NW part of Iran
belongs to the Iranian plateau that is a tectonically active region within the
Alpine-Himalayan orogenic belt. The intrusion of Oligocene parts in various
faces caused the alteration and mineralization such as copper, molybdenum, gold
and iron in the Siyahrood area. Granitoidic rocks with component of
Granodiorite to alkali have been influenced by hydrothermal fluids. Alteration
zones are important features for the exploration of deposits and the ASTER
sensor is able to identify the type of alteration and its alteration zoning.
This method can be a useful tool for detecting potential mineralization area in
East Azarbaijan—Northwest of Iran. The purpose of this study is to evaluate
ASTER data for mapping altered minerals in Siyahrood area in order to detect
the potential mineralized areas. In this study, false color composite, and band
ratio techniques were applied on ASTER data and argillic, phyllic, Iron oxide
and propylitic alteration zones were separated. ASAR image processing has been
used for lineaments and faults identified by the aid of directional filter. The
structural study focused on fracture zones and their characteristics including
strike, length, and relationship with alteration zones. The results of this
study demonstrate the usefulness of remote sensing methods and ASTER
multi-spectral data for alteration, and ASAR data are useful for lineament
mapping.