Microfacies analysis and diagenetic fabric of the Lockhart Limestone exposed near Taxila, Margalla Hill Range, Punjab, Pakistan

  • Mohibullah Khan
  • Mumtaz Ali Khan
  • Birkhez Aslam Shami
  • Muhammad Awais
Original Paper


The microfacies analysis and diagenetic fabric of the Lockhart Limestone are studied in an outcrop section exposed in the Margalla Hill ranges. The Lockhart Limestone is predominantly composed of medium to thick bedded, nodular and occasionally brecciated, highly fossiliferous limestone with thin interbeds of marl and shale. On the basis of detailed petrographic investigations, four microfacies have been identified including bioclastic packstone, wackestone (siliciclastic bioclastic rich sub-microfacies), wackestone-packstone, and mud-wackestone. Based on the microfacies analysis, the Lockhart Limestone is interpreted to have been deposited in the fore-shoal mid-ramp, mid-ramp, and outer ramp depositional environments. The Paleocene age has been assigned to the Lockhart Limestone based on age diagnostic foraminifera, i.e., Miscellanea, Lockhartia, and Ranikothalia. The diagenetic fabric of the Lockhart Limestone is characterized by several diagenetic features such as micritization, neomorphism (aragonite to calcite transformation and development of microspar), compaction, pressure dissolution (microstylolites), and cementation (calcite-filled microfractures). Such diagenetic features are developed in marine, meteoric, and burial diagenetic settings. The Paleocene Lockhart Limestone of Pakistan shows analogous features to that of the Paleocene Zongpu Formation (Member-3) of the Gamba-Tingri Basin of southern Tibet based on the outcrop features, microscopic fabric, and depositional environment.


Paleocene Microfacies Lockhart Limestone Diagenetic fabric Margalla Hill ranges Pakistan Zongpu Formation Tibet 



The authors would like to thank Department of Earth and Environment Sciences, Bahria University, Islamabad, for assistance and cooperation in completion of this research work. The authors are grateful to NCE in Geology, University of Peshawar, Peshawar, Pakistan, for facilitating thin section preparation and petrographic studies.


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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  • Mohibullah Khan
    • 1
    • 2
  • Mumtaz Ali Khan
    • 2
  • Birkhez Aslam Shami
    • 2
  • Muhammad Awais
    • 3
  1. 1.Department of Environmental and Conservation SciencesUniversity of SwatSwatPakistan
  2. 2.Department of Earth and Environmental SciencesBahria UniversityIslamabadPakistan
  3. 3.Department of GeologyUniversity of SwabiSwabiPakistan

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