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Journal of the Geological Society; 2001; v. 158; issue.6; p. 969-981;
DOI: 10.1144/0016-764901-007
© 2001 Geological Society of London

Regular Article

Progressive unconformities within an evolving foreland fold–thrust belt, Zagros Mountains

KHALED HESSAMI1, HEMIN A. KOYI1, CHRISTOPHER J. TALBOT1, HADI TABASI2 & ESMAEL SHABANIAN2

1 1Hans Ramberg Tectonic Laboratory, Department of Earth Sciences, Uppsala University, SE-752 36 Uppsala, Sweden (e-mail: khaled.hessami@geo.uu.se)
2 2International Institute of Earthquake Engineering and Seismology, PO Box 19395/3913, Tehran, Iran

Abstract: A major angular unconformity between the Bakhtyari conglomerates and the underlying Agha Jari Formation has long been interpreted as indicating that orogeny in the Zagros Simply Folded Zone took place in Plio-Pleistocene times. This study uses field evidence of unconformities between older units in conjunction with geological maps and cross sections to argue that the front of the Zagros Simply Folded Zone has propagated in time and space. These unconformities indicate that deformation started as early as end Eocene in the northeast of the Simply Folded Zone and propagated progressively to the southwest, where unconformable contacts are only seen between younger units. As shortening continued, the southwest migration of the deformation front drove the foreland basin in front of it to its present position along the Persian Gulf and Mesopotamia. The climax of orogeny took place at end Pliocene time when the most extensive unconformity in the Zagros Simply Folded Zone developed between the (upper) Bakhtyari Formation and older units. Active seismicity and documented present uplift imply that the Simply Folded Zone is still propagating southwestward.


Keywords: Zagros, Iran, orogeny, unconformities, folds.




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