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DOI: 10.1144/SP330.4

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Special Publication - Geological Society of London 330 (2010) 41-64

The transition between Makran subduction and the Zagros collision: recent advances in its structure and Active deformation

Vincent Regard (  Corresponding author ) 1, Denis Hatzfeld 2, Matteo Molinaro 3, Charles Aubourg 3, 4, R. Bayer 5, O. Bellier 6, Farzam Yamini-Fard 2, 7, M. Peyret 5, M. R. Abbassi 7

For the French-Iranian Collaboration (D. Hatzfeld / M. Ashtiani) collaboration(s)

(2010-04-01)

South-east Iran is the site of a rare case of young transition between subduction and collision. We synthesized recent results in geodesy, tectonics, seismology and magnetism to understand the structure and kinematics of the Zagros-Makran transition. Surface observations (tectonics, magnetism and geodesy) draw a transpressive discontinuity consisting of several faults striking obliquely to the convergent plate motion, whereas deeper observations (seismology) support a smooth transition across the fault system. No lithospheric transform fault has been created, even though the transition already behaves like a major boundary in terms of tectonic style, seismic structure, lithology and magnetism. The Zendan-Minab-Palami fault system consists of several faults that accommodate a transpressive tectonic regime. It is the surface expression of a southward propagation of the N-trending right-lateral strike-slip fault system of Jiroft-Sabzevaran. Within each system the numerous faults will coalesce into a single, lithospheric, wrench fault.

1:	Laboratoire des Mécanismes et Transfert en Géologie (LMTG)
	CNRS : UMR5563 – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III – Institut de recherche pour le développement [IRD] : UMR154
2:	Laboratoire de géophysique interne et tectonophysique (LGIT)
	CNRS : UMR5559 – Institut de recherche pour le développement [IRD] – LCPC – OSUG – INSU – Université de Savoie – Université Joseph Fourier - Grenoble I
3:	Laboratoire de tectonique (LT)
	CNRS : UMR7072 – INSU – Université Pierre et Marie Curie (UPMC) - Paris VI – Université de Cergy Pontoise
4:	Département des Sciences de la Terre
	Université de Cergy Pontoise
5:	Géosciences Montpellier (GM)
	CNRS : UMR5243 – Université Montpellier II - Sciences et techniques
6:	Centre européen de recherche et d'enseignement de géosciences de l'environnement (CEREGE)
	CNRS : UMR6635 – Institut de recherche pour le développement [IRD] – INSU – Université de Provence - Aix-Marseille I – Université Paul Cézanne - Aix-Marseille III
7:	International Institute of Earthquake Engineering and Seismology (IIEES)
	International Institute of Earthquake Engineering and Seismology

Subject

:

Sciences of the Universe/Earth Sciences/Geomorphology

Keyword(s): subduction – collision – Iran – Zagros – Makran – transform fault

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From: Vincent Regard <>

Submitted on: Tuesday, 27 January 2009 16:38:58

Updated on: Thursday, 19 August 2010 14:00:58