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)

Abstract

East Azarbaijan belongs to the Iranian plateau and is part of lesser Caucasus province. Studied area 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 hydrothermal fluids rise 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.

A groundwater potential zone mapping approach for semi-arid environments using remote sensing (RS), geographic information system (GIS), and analytical hierarchical process (AHP) techniques: a case study of Buffalo catchment, Eastern Cape, South Africa

“…Importantly, the zones of very high to moderate lineament density lie around the edges of the Karoo dolerite where the intrusion of magma creates a contact zone between the dolerite and the pre-existing sedimentary rock. Areas of extensive fracture system are replicated by high lineament density (Mostafa and Bishta 2005;Khosroshahizadeh et al 2016;Meixner et al 2018). Hence, the zones of effectively high/moderate lineament density, therefore, serve as a modifier for high-drained fractured dolerite that was ranked as very poor for groundwater potential under the surficial lineament.…”

Alteration Mapping in Central Urumieh-Dokhtar Magmatic Assemblage of Iran Using ASTER and OLI Data

“…Faults and fractures can affect mineralization by leading magma and hydrothermal fluids to shallower levels, and accumulate or concentrate metal elements [3]. Lineaments play an important role in the initial exploration of geological structures for the identification of minerals [4]. Therefore, areas with good mineral potential are associated with high density of faults and fractures.…”