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Discussion papers
https://doi.org/10.5194/esurf-2018-78
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/esurf-2018-78
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 21 Nov 2018

Research article | 21 Nov 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Earth Surface Dynamics (ESurf).

Dating and morphostratigraphy of uplifted marine terraces in the Makran subduction zone (Iran)

Raphaël Normand1, Guy Simpson1, Frédéric Herman2, Rabiul Haque Biswas2, Abbas Bahroudi3, and Bastian Schneider4 Raphaël Normand et al.
  • 1Department of Earth Sciences, University of Geneva, Rue des Maraichers 13, 1205 Genève, Switzerland
  • 2Institute of Earth Surface Dynamics, Faculty of Geosciences and Environment, University of Lausanne, 1012 Lausanne, Switzerland
  • 3Exploration department, School of Mining Engineering, University of Tehran, Northern Kargaravn, P.O. Box 11365-4563, Tehran, Iran
  • 4Steinmann Institute of Geology, University of Bonn, Nussallee 8, 53115 Bonn, Germany

Abstract. The western part of the Makran subduction zone (Iran) has not experienced a great megathrust earthquake in recent human history, yet, the presence of emerged marine terraces along the coast indicates that the margin has been tectonically active during at least the late Quaternary. To better understand the surface deformation of this region, we mapped the terraces sequences of seven localities along the Iranian Makran. Additionnaly, 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 1.2mmy−1. We detected a region of anomalously high uplift rate, where two MIS 3 terraces are emerged, yet we are uncertain how to insert these results in a geologically coherent context. Although it is presently not clear whether the uplift of the terraces is linked with the occurrence of large megathrust earthquakes, our results highlight heterogeneous accumulation of deformation in the overriding plate.

Raphaël Normand et al.
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Data from: Dating and morphostratigraphy of uplifted marine terraces in the Makran subduction zone (Iran) R. Normand, G. Simpson, F. Herman, R. H. Biswas, A. Bahroudi, and B. Schneider https://doi.org/10.5281/zenodo.1468857

Raphaël Normand et al.
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Short summary
We studied uplifted marine terraces in the southern Iran that are part of the Makran subduction zone. Our results show that most terraces were formed in the last 35 000–250 000 years. Based on their altitude and the paleo sea-level, we derive surface uplift rates of 0.05–5 mm yr−1. The results indicate that the region has been accumulating permanent deformation during the Late Quaternary, but we are currently uncertain whether this deformation occurs continuously or during large earthquakes.
We studied uplifted marine terraces in the southern Iran that are part of the Makran subduction...
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