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- Title
Facies analysis, depositional model and sequence stratigraphy of the Upper Permian Chiddru Formation, Salt Ranges, Upper Indus Basin, Pakistan.
- Authors
Ahmad Jr., Sajjad; Ali, Asghar; Haneef, Muhammad; Waqas, M.; Ali, Johar; Khan, Shaheen Sher; Sadiq, Akbar; Yaqoob, Muhammad; Ibad-ur-Rehman
- Abstract
We analyzed the outcrop data from two key stratigraphic sections (the Nammal Gorge and the Chhidru Nala) in the Salt Ranges, Upper Indus Basin of Pakistan to understand the depositional dynamics of the Upper Permian Chhidru Formation. In present study three microfacies and two lithofacies types have been identified. The microfacies are sandy mudstone, sandy mudstone-wackestone, and sandy wackestone-packestone and the lithofacies types include feldspathic greywacke and quartz-wacke. The characterization of these facies supports deposition in a proximal inner shelf to distal middle shelf settings of a siliciclastic-carbonate mixed platform in the study area. Based on the fusuliniid biostratigraphy two 3rd order depositional sequences (TST/RST) are identified that encompass six 4th order depositional sequences (parasequences), each bounded by a marine flooding surface. Of particular interest, are the lowermost (253.8my) and the uppermost (252.5my) sequence boundaries, which show significant global signature of eustatic sea level changes in local depositional signals while the parasequence boundaries are the results of interplay between local tectonics and sediment supply.
- Subjects
FACIES; MUDSTONE; QUARTZ; FELDSPAR; LITHOFACIES; SEDIMENTS
- Publication
Journal of Himalayan Earth Science, 2012, Vol 45, Issue 2, p6
- ISSN
1994-3237
- Publication type
Article