Stratal extension in thrust footwalls, Makran accretionary prism: implications for thrust tectonics
Journal Article
·
· Am. Assoc. Pet. Geol., Bull.; (United States)
OSTI ID:7175939
Small-scale stratal extension is commonly associated with thrust faults in the Makran accretionary prism of southwest Pakistan. Low-angle normal faults, dipping in the direction of transport relative to the thrust, are common in gouge zones and duplexes, and may also cut the footwall and hanging wall, where they cause stratal extension. These faults are probably Riedel shears. The authors have studied a broad zone of more complex extensional deformation beneath one bedding-parallel thrust. The zone disrupts earlier compressional structures and affects a significant volume of the footwall. Normal faults, initiating in a rearward sequence, branch off the thrust and cut down into the footwall, merging at a lower stratigraphic level. Part of the thrust displacement was thereby transferred to that level, and fragments of the footwall were detached and transferred southward beneath the hanging wall. The latter remained undeformed, and accommodation structures are confined to the footwall. These effects may have been caused by variations in sliding resistance along the fault. 14 figures.
- Research Organization:
- Oxford Univ., England
- OSTI ID:
- 7175939
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Vol. 70:2; ISSN AAPGB
- Country of Publication:
- United States
- Language:
- English
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