Dating and morpho-stratigraphy of uplifted marine terraces in the Makran subduction zone (Iran)
<p>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 Makra...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2019-03-01
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| Series: | Earth Surface Dynamics |
| Online Access: | https://www.earth-surf-dynam.net/7/321/2019/esurf-7-321-2019.pdf |
| Summary: | <p>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, <span class="inline-formula"><sup>230</sup>Th∕U</span> 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 1.2 mm yr<span class="inline-formula"><sup>−1</sup></span>. 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.</p> |
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| ISSN: | 2196-6311 2196-632X |