TITLE:
Lineament Patterns and Mineralization Related to Alteration Zone by Using ASAR-ASTER Imagery in Hize Jan-Sharaf Abad Au-Ag Epithermal Mineralized Zone (East Azarbaijan—NW Iran)
AUTHORS:
Shabnam Khosroshahizadeh, Mohsen Pourkermani, Mahmood Almasian, Mehran Arian, Ahmad Khakzad
KEYWORDS:
Hizejan-Sharafabad Lineament, ASTER Image, ASAR image, NW Iran, Directional and Canny Algorithm
JOURNAL NAME:
Open Journal of Geology,
Vol.6 No.4,
April
19,
2016
ABSTRACT: East Azarbaijan belongs to
the Iranian plateau and is part of lesser Caucasus province.Studiedarea is located in west-central
Alborz. The intrusion of oligocene bodies in various units causes the
alteration and mineralization in northwest of Iran. The Hizejan-Sharafabad is
one of this named mineralized zone. Granitoidicrocks with component of
Granodiorite to alkali have been influenced by hydrothermal fluids. Fractures
and faults are as weak zone in earth surface and hydrothermalfluidsrise to surface by these geological
structures. These solutions cause to alteration in host rocks. Alteration zones
are important features for the exploration of deposits. The altered rocks have
specific absorption in some spectral portion and ASTER sensor is able to
identify the type of alteration. Remote sensing method is useful tool for
discovering altered area. The purpose of this study is to appraise ASTER data for
surveying altered minerals in Hizejan-Sharafabad area in the event of detecting
the potential mineralized areas. In this research, False Color Composite (FCC),
Band ratio, and color composite ratio techniques are applied on ASTER data and
Silica, Argilic, and Propylitic alteration zones are detected. These alteration
types and mineralized area are related to Hizejan–Sharafabad fault which is
absent in the fault maps. ASAR image processing has been used for lineaments
and faults identified by the aid of Directional and Canny Algorithm filters.
The structural study focuses on fracture zones and their characteristics
including strike, length, and relationship with alteration zones.