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Forward propagation of the Zagros Simply Folded Belt constrained from magnetostratigraphy of growth strata.

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2014
Author Ruh J.B. Hirt A.M. Burg J.-P. Mohammadi A. ,
Project Towards understanding long-term accretionary wedge dynamics: An integrated modelling and field study of the Tertiary Makran and southern Sistan of Iran
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Original article (peer-reviewed)

Journal Tectonics
Volume (Issue) 33(8)
Page(s) 1534 - 1551
Title of proceedings Tectonics
DOI 10.1002/2013TC003465

Open Access

URL http://onlinelibrary.wiley.com/doi/10.1002/2013TC003465/epdf
Type of Open Access Publisher (Gold Open Access)

Abstract

The temporal evolution of the Zagros Simply Folded Belt is constrained by a magnetostratigraphic sequence containing a progressive unconformity on the southern limb of the Kuh-e Ghol Ghol anticline, in the Central Fars. The investigated ~1400m thick sequence exposes a regressive megacycle containing, from bottom to top, open and shallow marine marls and sandy limestones, fine- to coarse-grained fluvial deposits and alluvial conglomerates. Correlating the magnetostratigraphic section with the geomagnetic polarity time scale constrains the transition from marine to fluvial sediment deposition at ~6 Ma. This transition was accompanied by a change in the accumulation rate from ~15 cm/ka to ~40 cm/ka, as measured on lithified sediments. Alluvial river deposits first occurred at ~3.2 Ma. The Kuh-e Ghol Ghol anticline began to grow at ~3.8 Ma, witnessing fastest limb rotation rates of 40°/Ma at ~3.3 Ma. Reporting magnetostratigraphic sections and ages of growth strata on a map of NE Fars reveal an ~1 cm/a, southwestward migration rate of the deformation front during the middle and late Miocene.
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