Dating the deformation in the front of the Push-e Kush Arc (Zagros belt, Iran)

S. Homke ^[1] ; J. Vergés ^[1] ; M. Garcés ^[2] ; H. Emami ^[1] ; R. Karpuz ^[3]
1. [1] Instituto de Ciencias de la Tierra Jaume Almera
  
  Instituto de Ciencias de la Tierra Jaume Almera
  
  Barcelona, España
2. [2] Universitat de Barcelona
  
  Universitat de Barcelona
  
  Barcelona, España
3. [3] Hydro Zagros Oil & Gas
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Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 6, 2, 2004 (Ejemplar dedicado a: IV Congreso Geológico de España), págs. 153-155
Idioma: español
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Resumen
- The timing of the deformation in the Zagros fold-and-thrust belt is poorly constrained because of the lack of accurate dating of syntectonic sediments. A magnetostratigraphy study was performed on foreland sediments in the front of the Push-e Kush Arc in order to date growth strata, and thus to constrain the timing of the deformation in the Mountain Front Flexure. The foreland stratigraphic column is composed of typical fluvial plain deposits (Agha Jari Fm) and coarse conglomerates at the top of the section (Bakhtyari Fm). The base of the growth strata, and thus the beginning of the deformation in the front of the Push-e Kush Arc, is dated between 8.1 -7.2 Ma. The top of preserved Bakhtyari conglomerates, deposited around 1.5 Ma, is tilted on the SW flank of the frontal Changuleh syncline but is unconformably overlying its NE flank. The growth of the MFF was thus fossilized at 1.5 Ma, while the Changuleh anticline, to the SW, remained active