Abstract

Data Fusion of ETM and IRS-Pan Images for Morphological Analysis of Salt Plugs in the Kuh-e Gugird, South of Semnan, Iran

Fatemeh Mola Mehralizadeh
Expert In Geologic Remote Sensing
Iran Space Agency (ISA), Iran
Email: falizadeh@isa.ir

Mehran Azizzadeh
Researcher
Research Institute of Petroleum Industry (RIPI), Iran
Email: azizzadehm@ripi.ir


Abstract :
The 150-km long Kuh-e Gugird anticline has been located in north of Great Kavir basin of Central Iran that forms an east-trending swell separating the two diapiric subbasins. In this area, 54 salt domes have been truncated and exposed by erosion. Because of difficulties for deep field surveys and time limitation, the investigating of the region, have been done by remote sensing data. So, RS data with high spectral characteristics such as Landsat have been used and have been fusion it by high spatial resolution such as IRS-Pan in ER-MAPPER 6.3 for extraction and analysis of external structure and surrounding rocks of salt plugs.

On the basis of ETM data, the domes range in size from 1 to nearly 10 km wide about a mean nearly 6 km. Also, the most common shapes of diapirs that is recognizable on was Fusion images, consist of circular, elliptical, and egg-like shapes, but a wide range of other forms is present, including comma-shaped, bean shaped, etc. All the diaper plugs are bounded by a highly strained conformable contact zone. This zone consists of three parts, from the inside out: (1) highly sheared diapiric salt, (2) gypsum rim with 20 to 200m wide; and (3) highly sheared untitled overburden. Salt tectonics was strongly linked with sedimentation and regional tectonics in the study area.

Also, DEM of the region produced by using topographic maps for prepare of slope and aspect maps of the area.

Finally, the results have been loaded in ArcGIS 9, in order to morphological analysis of salt domes in the area. As a result, the simple pattern of diapiric upwelling has been disrupted and overwhelmed by superposed regional folding in the foreland of the Elburz orogen.