 |
| Titel |
Palaeostress review of the Zagros fold-and-thrust belt and tectonic implications |
| VerfasserIn |
Payman Navabpour, Eric Barrier |
| Konferenz |
EGU General Assembly 2011
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250047634
|
|
|
|
|
|
| Zusammenfassung |
| The present-day Zagros fold-and-thrust belt of SW-Iran corresponds to the former Arabian
passive continental margin of the southern Neo-Tethyan basin since the Permian–Triassic
rifting, undergoing later collisional deformation in mid-late Cenozoic times. Here an
overview of brittle tectonics and palaeostress reconstructions of the Zagros fold-and-thrust
belt is presented, based on direct stress tensor inversion of fault slip data. Results indicate that
after the Permian–Triassic rifting and during the Neo-Tethyan oceanic opening, an
extensional tectonic regime affected the sedimentary cover in Triassic–Jurassic times with an
approximately N–S trend of Ïă3 stress axis oblique to the present-day trend of the mountain
belt. Some local changes in the stress field indicate a NE–SW trend of the Ïă3 axis during
Jurassic–Cretaceous times. The stress state then significantly changed to thrust
setting, with a NE–SW trend of Ïă1 stress axis, and a compressional tectonic regime
prevailed during the continental collision and folding of the sedimentary cover in
Oligocene–Miocene times. The compression was followed by a strike-slip stress
regime with an approximately N–S trend of the Ïă1 axis oblique to the mountain belt
during inversion of the inherited extensional basement structures in Pliocene–Recent
times. The brittle tectonic reconstructions, therefore, highlighted major changes of
the stress state in conjunction with transitions between thin- and thick-skinned
structures during different extensional and compressional stages of continental
deformation within the oblique divergent and convergent settings, respectively. |
|
|
|
|
|
|