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Volume 16 Issue 2
Jun 2005
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Shahid Naseem, Shamim Ahmed Sheikh, Erum Bashir, Khaula Shirin. Geochemistry and Depositional Setting of Fort Munro Formation, Middle and Lower Indus Basins, Pakistan. Journal of Earth Science, 2005, 16(2): 160-169.
Citation: Shahid Naseem, Shamim Ahmed Sheikh, Erum Bashir, Khaula Shirin. Geochemistry and Depositional Setting of Fort Munro Formation, Middle and Lower Indus Basins, Pakistan. Journal of Earth Science, 2005, 16(2): 160-169.

Geochemistry and Depositional Setting of Fort Munro Formation, Middle and Lower Indus Basins, Pakistan

  • Received Date: 20 Nov 2004
  • Accepted Date: 18 Mar 2005
  • Fort Munro Formation represents the products of the Upper Cretaceous (Maastrichtian) in the middle and lower Indus basins. The formation is exposed in the Rakhi Nala (Sulaiman Range), Bara Nala (Lakhi Range) and Naka Pabni (Southern Pab Range) areas. Major and trace elemental geochemistry and petrographic studies of the formation have been carried out to understand the facies trends in the middle and lower Indus basins. A high amount of acid-insoluble fraction, Ca/Mg and Mg vs. Ca/Sr ratio reveal that the formation was deposited in a shallow marine regressive environment. High amounts of clastic reflect abundant influx of terrigenous materials from the east (Indian craton) and west (Bibai volcanic). High Sr content indicates that aragonite was the precursor mineral, which was transformed into stable low-Mg calcite during diagenesis. Enrichment of Cu and Zn contents in the samples of the formation implies the influence of volcanic activity and that they were incorporated into the calcite lattice in the late phase.

     

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