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Structural model of the Balkassar area, Potwar Plateau, Pakistan

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Abstract

Balkassar is an important hydrocarbon producing area of the Potwar Plateau, Pakistan. Two-dimensional seismic reflection data of the area revealed tectonically controlled, distinct episodes of (1) normal faulting in the basement followed by (2) reverse faulting in the cover sequence. Himalayan orogeny and associated diapirism of the Precambrian Salt Range Formation have produced many salt-cored anticlines in the Potwar Plateau, and one such salt-cored anticline is present in the Balkassar. This anticline has NE–SW-oriented axis, and both the SE and NW limbs are bounded by reverse faults. The basement normal faults indicate Jurassic rifting and splitting of Pangaea. We interpret reverse faults with dip angles of about 60°–75° in the cover sequence, having both hinterland and foreland vergence. Both NW- and SE-dipping faults are present in contrast to the only southward-directed thrusts of previous models. Duplexes and triangle zones, which are common in the northern part of the Potwar Plateau, are not developed in the Balkassar area due to comparatively less crustal shortening in the area. The present interpretation can help in understanding the complex structures in other parts of the Potwar Plateau for hydrocarbons exploration and also in deformed foreland basins worldwide that display similar characteristics but are considered to be dominated by low-angle thrust tectonics.

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Acknowledgments

The Authors are thankful to the Director General, Petroleum Concessions (DGPC), Pakistan, for the provision of data for this research work and Schlumberger, Pakistan, for providing the software facilities for the work. The authors highly appreciate the valuable remarks and suggestions of the reviewers Dr. Soumyajit Mukherjee and Dr. Afroz Ahmad Shah that greatly improved the manuscript. Prof. Michael Wagreich (University of Vienna) is thanked for his guidance during the work.

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  1. Department of Earth Sciences, Quaid-i-Azam University, Islamabad, 45320, Pakistan

    Shahid Iqbal & Gulraiz Akhter

  2. Department of Geodynamics and Sedimentology, University of Vienna, Vienna, Austria

    Shahid Iqbal

  3. Schlumberger, Islamabad, Pakistan

    Sehrish Bibi

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Iqbal, S., Akhter, G. & Bibi, S. Structural model of the Balkassar area, Potwar Plateau, Pakistan. Int J Earth Sci (Geol Rundsch) 104, 2253–2272 (2015). https://doi.org/10.1007/s00531-015-1180-4

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