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

Herman, Frédéric
Biswas, Rabiul Haque
Bahroudi, Abbas
Schneider, Bastian
Published in Earth surface dynamics. 2019, vol. 7, no. 1, p. 321-344
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.
Keywords Makran subduction zoneMarine terraceUplift rateOSLRadiocarbonCoastal tectonic
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Article (Published version) (13.1 MB) - public document Free access
Research group Earth Surface Dynamics
Swiss National Science Foundation: 200021_155904
(ISO format)
NORMAND, Raphaël et al. Dating and morpho-stratigraphy of uplifted marine terraces in the Makran subduction zone (Iran). In: Earth Surface Dynamics, 2019, vol. 7, n° 1, p. 321-344. doi: 10.5194/esurf-7-321-2019 https://archive-ouverte.unige.ch/unige:116714

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Deposited on : 2019-04-29

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