Fold-thrust styles in the Marwat-Khisor ranges, NWFP, Pakistan. | [Proceedings SPE-PAPG Annual Technical Conference • 2005]

Author(s):

1. Iftikhar Alam: PAEC, (DTD-Q) Quetta, Pakistan

2. Sajjad Ahmad: Department of Geology, University of Peshawar, Peshawar, Pakistan

3. Athar Ali: MOL Pakistan, Oil & Gas Co. B.V, 5th Floor ETC Building, F-5/l, Islamabad, Pakistan

4. M. Irfan Khan: MOL Pakistan, Oil & Gas Co. B.V, 5th Floor ETC Building, F-5/l, Islamabad, Pakistan

Abstract:

The Marwat-Khisor ranges define an eastwest to northeast trending told-thrust belt flanking the mobile perimeter of the Bannu Basin in the south. Key structural elements of the Khisor Range are the Paniala, Saidvuwali. Mir Ali and Khisor anticline along with a frontal thrust named as Khisor Thrust whereas Marwat Anticline constitute the main topographic expression of the Marwat Range. All these folds are generally asymmetric, overturned displaying south facing. Construction of balanced structural transects across these ranges suggest that the structural style is thin-skinned comprising decollement thrust-fold assemblages, kinematically related to a regional basal decollement located at the base the rocks of Jhelum Group. The Marwat Anticline Initially evolved as a low amplitude detachment told that was subsequently displaced over a non-emergent fault ramp to form fault-bend fold Geometry. This event was followed by another thrust ramp from the basal decollement in the south, forming fault-bend anticlinal folds in the overlying strata and finally emerged as Khisor Thrust at surface Juxtaposing .lhelum Group against the rocks of Siwalik Group.

Page(s): 80-93

DOI: DOI not available

Published: Journal: Proceedings SPE-PAPG Annual Technical Conference, Volume: 0, Issue: 0, Year: 2005

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