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Structural variation along the Zagros and the nature of the Dezful Embayment.

Allen, M.B. and Talebian, M. (2011) 'Structural variation along the Zagros and the nature of the Dezful Embayment.', Geological magazine., 148 (5-6). pp. 911-924.

Abstract

Structure varies along strike in the Zagros fold-and-thrust belt of Iran, which is a principal element in the Arabia–Eurasia continental collision. Pre-collision, Late Cretaceous ophiolite nappes (Kermanshah, Neyriz) and related nappes of deep marine sediments (Radiolarite Series) were emplaced next to two regions (Pusht-e Kuh arc, Fars) which later developed a consistent structural style across the range from the High Zagros Fault to the foreland limit of deformation. The intervening area has a zone of highly imbricated Arabian plate strata (the Bakhtyari Culmination) thrust southwest towards and over a low relief, low elevation region (the Dezful Embayment). There are no ophiolite nappes northeast of the Bakhtyari Culmination. Isopachs reflect these different structural patterns from Late Cretaceous time but not earlier. In Late Cretaceous time the Dezful Embayment recorded less deposition than adjacent areas to the northwest and southeast. In the Palaeogene there was little net difference between the Dezful Embayment and its margins. The Dezful Embayment has been a depocentre since roughly 35 Ma, which is the likely time of initial collision between Arabia and Eurasia. We propose that the syn-collision structure and stratigraphy of the Zagros is therefore strongly influenced by the variation in Late Cretaceous ophiolite emplacement, but the original cause of this variation is not clear.

Item Type:Article
Keywords:Zagros, Fold-and-thrust belt, Arabia–Eurasia collision, Iran.
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1017/S0016756811000318
Publisher statement:© Copyright Cambridge University Press 2011. This paper has been published in a revised form subsequent to editorial input by Cambridge University Press in 'Geological Magazine' (148: 5-6 (2011) 911-924) http://journals.cambridge.org/action/displayJournal?jid=GEO
Record Created:26 Feb 2015 13:35
Last Modified:26 Feb 2015 14:47

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