Geophysical Journal International Geophys. J. Int. (2017) 210, 1659–1680 doi: 10.1093/gji/ggx252 Advance Access publication 2017 June 9 GJI Geodynamics and tectonics Flexural bending of the Zagros foreland basin Mortaza Pirouz,1,2 Jean-Philippe Avouac,1 Adriano Gualandi,1 Jamshid Hassanzadeh1 and Pietro Sternai3 1Division of Geological and Planetary Sciences, California Institute of Technology, Mc 100–23, 1200 E California Blvd., Pasadena, CA 91125, USA. E-mail:
[email protected] 2Bullard Laboratories, Madingley Rise, Madingley Road, University of Cambridge, Cambridge CB30EZ, United Kingdom 3Section of Earth and Environmental Sciences, University of Geneva, 13 Rue des Maraˆıchers, 1205 Geneva, Switzerland Accepted 2017 June 7. Received 2017 June 5; in original form 2017 February 24 SUMMARY We constrain and model the geometry of the Zagros foreland to assess the equivalent elastic thickness of the northern edge of the Arabian plate and the loads that have originated due to the Arabia–Eurasia collision. The Oligo-Miocene Asmari formation, and its equivalents in Iraq and Syria, is used to estimate the post-collisional subsidence as they separate passive margin sediments from the younger foreland deposits. The depth to these formations is obtained by synthesizing a large database of well logs, seismic profiles and structural sections from the Mesopotamian basin and the Persian Gulf. The foreland depth varies along strike of the Zagros wedge between 1 and 6 km. The foreland is deepest beneath the Dezful embayment, in southwest Iran, and becomes shallower towards both ends. We investigate how the geometry of the foreland relates to the range topography loading based on simple flexural models.