Congervence history across Zagros (Iran) : contraints from collisional and earlier deformation - Archive ouverte HAL Access content directly
Journal Articles International Journal of Earth Sciences Year : 2005

Congervence history across Zagros (Iran) : contraints from collisional and earlier deformation

(1) , , (1) , (1)
1
J. Omrani
  • Function : Author
Laurent Jolivet
Frédéric Mouthereau
  • Function : Author
  • PersonId : 963058

Abstract

The Zagros orogen provides a unique opportunity within the Alpine system to evaluate the interplay between a young Tertiary collision and earlier subduction/obduction processes. Within the Crush zone and the Sanandaj-Sirjan (internal) zone separating the Zagros Fold belt from Central Iran, we document several major tectonic events taking place at the end of the Cretaceous, of the Eocene and from the Mio-Pliocene onwards (ca. <20-15 ma). contrary="" to="" recent="" interpretations,="" our="" data="" (cross-sections="" and="" description="" of="" the="" overall="" deformation="" style)="" strongly="" suggest="" that="" the="" main="" zagros="" thrust="" (mzt)="" is="" deeply="" rooted,="" possibly="" to="" moho="" depths,="" and="" that="" the="" suture="" zone="" effectively="" runs="" along="" the="" mzt.="" field="" observations="" show="" that="" the="" final="" resorption="" of="" the="" oceanic="" domain="" took="" place="" slightly="" after="" 35 ma="" and="" that="" collision="" must="" have="" started="" before="" ca.="" 23-25 ma="" in="" northern="" zagros.="" the="" shortening="" rate="" across="" the="" crush="" zone="" since="" the="" mid-miocene="" (20-15 ma)="" is="" estimated="" at="" a="" minimum="" 3-4 mm/year.="" shear="" movements="" in="" the="" crush="" zone="" during="" the="" eocene-oligocene="" period="" and="" extensional/strike-slip="" movements="" in="" the="" internal="" zones="" during="" the="" late="" cretaceous="" point="" to="" an="" oblique="" setting="" early="" in="" the="" convergence="" history.="" a="" geotectonic="" scenario="" for="" convergence="" from="" the="" time="" of="" obduction="" to="" the="" present="" is="" finally="">

Dates and versions

hal-00022396 , version 1 (07-04-2006)

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Philippe Agard, J. Omrani, Laurent Jolivet, Frédéric Mouthereau. Congervence history across Zagros (Iran) : contraints from collisional and earlier deformation. International Journal of Earth Sciences, 2005, 94, pp.401-419. ⟨10.1007/s00531-005-0481-4⟩. ⟨hal-00022396⟩
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