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Active tectonic study in northeast Iran: contribution of the Kopeh Dagh and Binalud mountains to the accommodation of the Arabia-Eurasia convergence

Abstract : This study focuses on the Plio-Quaternary faulting in northeast Iran including the Kopeh Dagh and Allah Dagh-Binalud mountains. A combined approach of detailed geological mapping, morphotectonic and fault kinematic analyses, as well as radiometric (40Ar/39Ar) and in situ-produced exposure dating (36Cl and 10Be) allowed us to characterize the active tectonic configuration of the northeastern Arabia-Eurasia collision zone. Along the Kopeh Dagh fault systems, a total strike-slip rate of 9±2 mm/yr is estimated. This is resolved to northward and westward slip rates of ~8 and ~4 mm/yr, respectively, for the western Kopeh Dagh relative to Eurasia. This strike-slip deformation is partly (~25 per cent) transferred southward through the “new-defined” Meshkan transfer zone. At the southwestern and northeastern sides of the Binalud, slip rates of 3.6±1.2 and 1.6±0.1 mm/yr are estimated, respectively. Our geologically determined long-term slip rates for both strike-slip (~4 mm/yr) and reverse (~2.4 mm/yr) components of faulting account for about 5 mm/yr of total slip rate at both sides of the range. This is resolved to a northward motion rate of ~4.5 mm/yr, and a rate of ~2 mm/yr for the westward motion of Central Iran relative to the eastern Kopeh Dagh. Quaternary stress analyses indicates that the different fault motions, from pure dip-slip to pure strike-slip, are only due to the fault orientations with respect to the far-field stress pattern, not due to partitioning. Altogether, these new data allow proposing a new tectonic configuration in which central Iran and the western Kopeh Dagh are translated northwestward relative to Eurasia due to intracontinental strike-slip faulting localized on distinct fault systems with unlike slip rates.
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https://tel.archives-ouvertes.fr/tel-00433264
Contributor : Esmaeil Shabanian <>
Submitted on : Wednesday, November 18, 2009 - 3:55:56 PM
Last modification on : Saturday, October 3, 2020 - 3:19:36 AM
Long-term archiving on: : Saturday, November 26, 2016 - 3:28:32 PM

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  • HAL Id : tel-00433264, version 1

Citation

Esmaeil Shabanian. Active tectonic study in northeast Iran: contribution of the Kopeh Dagh and Binalud mountains to the accommodation of the Arabia-Eurasia convergence. Tectonics. Université Paul Cézanne - Aix-Marseille III, 2009. English. ⟨tel-00433264⟩

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