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  • Geological constraints on the Western Kohat foreland basin, Khyber Pakhtunkhwa, Pakistan: Implication from 2D and 3D structural modelling

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رقم المقالة : IJES-1912-1420 (R4) زيارة : 156 الصفحة: 61 - 76

10.30495/ijes.2021.678954

نوع المخطوط: ابحاث

Geological constraints on the Western Kohat foreland basin, Khyber Pakhtunkhwa, Pakistan: Implication from 2D and 3D structural modelling

الموضوعات :

Syed Ahsan Gardezi 1 , Sajjad Ahmad 2 , Nawaz Ikram 3 , Gohar Rehman 4

1 - Geological Survey of Pakistan, AJK Directorate, Muzaffarabad (13100), Azad Kashmir Pakistan
2 - Department of Geology, University of Peshawar, Peshawar (25120), Khyber Pakhtunkhwa, Pakistan
3 - University of Azad Jammu and Kashmir, Muzaffarabad, Muzaffarabad (13100), Azad Kashmir, Pakistan
4 - Department of Geology, University of Peshawar, Peshawar (25120), Khyber Pakhtunkhwa, Pakistan.

تاريخ الإرسال : 20 الثلاثاء , ربيع الثاني, 1441 تاريخ التأكيد : 12 الخميس , ربيع الأول, 1442 تاريخ الإصدار : 19 الخميس , شعبان, 1442

الکلمات المفتاحية: Kohat Foreland Basin, Structural Modelling, Pakistan, Khyber Pakhtunkhwa,

ملخص المقالة :

The Kohat Foreland Basin is an outcome of continental collision between Indian and Eurasian plates defining the southern edge of Himalayan Orogenic System in the north-western Pakistan. This study constrains the structural geometry and kinematics in 2-D and 3-D workflow, evaluation of the role of multiple detachments and the structural correlation between surface and sub-surface geology of the western Kohat Foreland Basin. The structural style of the western Kohat Foreland Basin evinces the thin skin deformation associated with a couple of structural detachments i.e.i) base-Eocene shale/ evaporite sequence ii) the upper interface of crystalline basement. These detachments separate the outcropping and buried stratigraphic sequence of the Kohat Foreland Basin into upper and lower structural-stratigraphic domains. The lower domain has a series of north-dipping or south-verging fold-thrust assemblages incorporating a rigid rock sequence of EoCambrian to Paleocene. The comparatively more ductile rocks of the upper domain comprising of Eocene to Pliocene are deformed into tight, overturned, doubly plunging and internally faulted anticlines intervened by broad synclines. The two domains dictate different deformational behaviour and structural style, deforming in total disharmony; hence the structural geometry of shallow units does not match the sub-surface rocks. The total 37% of shortening in the sedimentary cover was revealed by structural balancing in 2-D and 3-D kinematic modelling. Stress analysis of Gurguri Fault unveiled 40% failure susceptibility and recorded positive values of effective normal stress (σn) with an orientation of maximum principle stress (σ1) as N17°.

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