Development and Synclinal-Anticlinal Breakthrough of Fault-Propagation Fold: Insights from Borr Dhoro Section of the Ranikot Anticline, Southern Kirthar Fold Belt, Pakistan

Abstract

Kirthar Fold Belt is one of the important parts of the tectonic and structural system of the Pakistan that developed during Cenozoic due to the transpressional collision of Indian plate with Afghan block along the Ornach-Nal and Chaman fault system. Ranikot anticline is the N-S trending frontal anticline of Kirthar Fold Belt. Borr Dhoro Section is located nearly in the central part of anticline, where anticline is asymmetrical, overturned and east-vergent fault propagation fold that underwent anticlinal as well as synclinal breakthrough. Along the anticlinal breakthrough fault, Late Cretaceous Pab Sandstone is moved over Paleocene/Eocene sequence. Along the synclinal breakthrough Eocene rocks moved over the Neogene Molasse. Forelimb of the anticline is overturned and back limb has gentle dip.