Stratigraphy and depositional environments of the Paleogene of the Potwar Plateau, northern Pakistan
Conference
·
· AAPG Bulletin (American Association of Petroleum Geologists); (United States)
OSTI ID:7013103
- Univ. of South Carolina, Columbia, SC (United States)
- Pennsylvania State Univ., University Park (United States)
The Paleogene sequence in the Potwar Plateau of northern Pakistan is dominated by carbonates and shales, representative of the final marine sedimentary episode along the southern Neo-Tethys. Measured sections at 16 locations on the perimeter of the plateau were used to reconstruct the Paleogene depositional environments. The lowest Paleogene deposits comprise a widespread basal transgressive clastic unit (Hangu Formation) overlain by a shallow shelf limestone (Lockhart Formation). Across much of the plateau, the Lockhart was followed by euxinic, deep-water calcareous shale (Patala Formation), which grades southeastward (cratonward) into coal-bearing paralic deposits. The overlying Nammal, Sakesar, and Chor Gali formations record gradual shallowing of the basin, with inner shelf and intertidal carbonates prograding over deep-water limestones. Regression culminated in red bed (Mami Khel Formation) and evaporite deposition. Although a second, limited transgression resulted in renewed limestone deposition (Kohat Formation) in the north and west, the bulk of the Paleogene represents a single transgressive-regressive cycle. This cycle can be correlated with published descriptions of the Paleogene on the northern margin of most of the Indo-Pakistan subcontinent.
- OSTI ID:
- 7013103
- Report Number(s):
- CONF-910403--
- Conference Information:
- Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Journal Volume: 75:3
- Country of Publication:
- United States
- Language:
- English
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