Lithological Mapping of Sedimentary Rocks in Southern Laki Range, Lower Indus Basin Using Satellite Remote Sensing Data

M. R. KHASKHELI, M. A. LEGHARI, S. H. SOLANGI, S. A. ABBASI

Abstract


Lithological mapping of rocks by using Landsat7 Images is carried out in Thano Bula Khan area in southern Indus Basin. The area is mainly composed of various sedimentary rocks of various formations are well exposed in Thano Bula Khan area. The areas composed of the exposed different geologically formations include Dada Conglomerate, Manchar Fm, Gaj Fm, Nari Fm, Tiyon Fm and Laki Fm. To process data, we used band rationing technique such as false color composite band ratio for identifying lithological features of the study area. Our processed data revealed the exposed formations of sedimentary rocks in the study area. The Landsat7 Satellite imagery is proved to be very useful in discriminating the lithology of various formations of the selected area. The data band ratio pairs (5/7, 5/4, 3/1) as well as RGB composite images (4/5, 5/7, 7/5) and (5/7, 3/1, 4/3) played an important role in discriminating different formations of sedimentary rocks in the area. The method using ratios of color band is significant approach for the study of different types of rocks as well as for the identification of minerals.


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