Identification of neotectonics using DEM-based local base-level approach in Pothwar plateau. | [Proceedings of Pakistan Academy of Sciences • 2013]

Author(s):

1. Syed Amer Mahmood: Department of Space Science, University of the Punjab, Lahore 54590, Pakistan

2. Jahanzeb Qureshi: Department of Space Science, University of the Punjab, Lahore 54590, Pakistan

3. Sajid Rashid Ahmad: Institute of Geology, University of the Punjab, Lahore 54590, Pakistan

4. Javed Sami: Department of Space Science, University of the Punjab, Lahore 54590, Pakistan

5. Amer Masood: Institute of Geology, University of the Punjab, Lahore 54590, Pakistan

6. Hafiz Muhammad Rafique: School of Physical Sciences, Department of Physics, University of the Punjab, Lahore 54590, Pakistan

Abstract:

The isobase map (local base-level map) represents the erosional stages and it gives a strong relationship between different Strahler order streams and the local erosional conditions in a changing topography. This approach is quick, efficient and reliable to delineate neotectonic influence within the same rock types. In this research, we evaluate the geomorphic landforms of Pothowar Plateau and Kalabagh fault zone using local base level approach. The purpose is to demarcate boundaries and to see whether they are influenced by the active tectonics or lithologic difference. For this purpose, we extracted the drainage network in the form of second and third order Srahler streams and automatic lineaments (by Houghman transformation)from SRTM 90m DEM. The isobase map was constructed based on the points of intersection of automated contours from the DEM and with the selected stream orders. We observed different base-level anomalies that relate to the prominent neotectonic features and lithological boundaries as presented in the published geological maps. The orientation, deflection and disconnection of the isobase lines correspond well with the local structures in the study area.

Page(s): 299-308

DOI: DOI not available

Published: Journal: Proceedings of Pakistan Academy of Sciences, Volume: 50, Issue: 4, Year: 2013

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