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Article Dans Une Revue International Journal of Earth Sciences Année : 2005

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

Philippe Agard
J. Omrani
  • Fonction : Auteur
Laurent Jolivet
Frédéric Mouthereau
  • Fonction : Auteur
  • PersonId : 963058

Résumé

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 et versions

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

Identifiants

Citer

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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