A Paleogeographic and Depositional Model for the Neogene Fluvial Succession, Pishin Belt, Northwest Pakistan: Effect of Post Collisional Tectonics on Sedimentation in a Peripheral Foreland Setting

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  • Aimal Khan Kasi, Centre of Excellence in Mineralogy, University of Balochistan, Science Block, Quetta, Pakistan
  • Akhtar Muhammad Kassi, Department of Geology University of Balochistan, Quetta, Pakistan
  • Muhammad Umar, Department of Earth Sciences, COMSATS Institute of Information Technology, Department of Geology, University of Balochistan, Quetta, Pakistan
  • Henrik Friis
  • Mohibullah Mohibullah, Department of Geology, University of Balochistan, Quetta
  • ,
  • Razzaq Abdul Manan, Centre of Excellence in Mineralogy, University of Balochistan, Quetta , Pakistan
Detailed facies analysis of the Neogene successions of the Pishin Belt (Katawaz Basin) has enabled documentation of successive depositional systems and palaeogeographic settings of the basin formed by the collision of northwestern continental margin of Indian Plate and Afghan Block. During Early Miocene subaerial sedimentation started after the final closure of Katawaz Remnant Ocean. Based on detailed field data twelve facies were recognized in Neogene successions exposed in Pishin Belt. These facies were further organized into four facies associations i.e. channels, crevasse splay, natural levee and floodplain facies associations. Facies associations and variations provided ample evidences to recognize number of fluvial architectural components in the succession e.g., low-sinuosity sandy braided river, mixed-load meandering, high-sinuosity meandering channels, single-story sandstone and/or conglomerate channels, lateral accretion surfaces (point bars) and alluvial fans. Neogene sedimentation in the Pishin Belt was mainly controlled by active tectonism and thrusting in response to oblique collision of the Indian Plate with Afghan Block of the Eurasian Plate along the Chaman-Nushki Fault. Post Miocene deformation of these formations successively caused them to contribute as an additional source terrain for the younger formations
TidsskriftActa Geologica Sinica - English Edition
Sider (fra-til)499-518
StatusUdgivet - 27 apr. 2018

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