Dating and morpho-stratigraphy of uplifted marine terraces in the Makran subduction zone (Iran)

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.5194/esurf-7-321-2019.

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Authors

Raphaël Normand , Guy Simpson, Frederic Herman, Rabiul Haque Biswas, Abbas Bahroudi, Bastian Schneider

Abstract

The western part of the Makran subduction zone (Iran) is currently experiencing active surface uplift, as attested by the presence of emerged marine terraces along the coast. To better understand the uplift recorded by these terraces, we investigated seven localities along the Iranian Makran and we performed radiocarbon, 230Th/U and optically stimulated luminescence (OSL) dating of the layers of marine sediments deposited on top of the terraces. This enabled us to correlate the terraces regionally and to assign them to different Quaternary sea-level highstands. Our results show east–west variations in surface uplift rates mostly between 0.05 and 1.2mmyr^-1. We detected a region of anomalously high uplift rate, where two MIS 3 terraces are emerged, but we are uncertain how to interpret these results in a geologically coherent context. Although it is presently not clear whether the uplift of the terraces is linked to the occurrence of large megathrust earthquakes, our results highlight rapid surface uplift for a subduction zone context and heterogeneous accumulation of deformation in the overriding plate.

DOI

https://doi.org/10.31223/osf.io/u2ahp

Subjects

Earth Sciences, Geomorphology, Physical Sciences and Mathematics, Tectonics and Structure

Keywords

radiocarbon, Makran subduction zone, Coastal tectonic, Marine terraces, OSL, Uplift rate

Dates

Published: 2019-05-03 15:32

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License

CC BY Attribution 4.0 International

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