Holocene Sedimentary Record and Coastal Evolution in the Makran Subduction Zone (Iran)

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Version: Final published version
License: CC BY 4.0
Serval ID
serval:BIB_21863D4CDF01
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Holocene Sedimentary Record and Coastal Evolution in the Makran Subduction Zone (Iran)
Journal
Quaternary
Author(s)
Normand Raphaël, Simpson Guy, Herman Frédéric, Biswas Rabiul Haque, Bahroudi Abbas
ISSN
2571-550X
Publication state
Published
Issued date
12/06/2019
Peer-reviewed
Oui
Volume
2
Number
2
Pages
21
Language
english
Abstract
The western Makran coast displays evidence of surface uplift since at least the Late Pleistocene, but it remains uncertain whether this displacement is accommodated by creep on the subduction interface, or in a series of large earthquakes. Here, we address this problem by looking at the short-term (Holocene) history of continental vertical displacements recorded in the geomorphology and sedimentary succession of the Makran beaches. In the region of Chabahar (Southern Iran), we study two bay-beaches through the description, measurement and dating of 13 sedimentary sections with a combination of radiocarbon and Optically Stimulated Luminescence (OSL) dating. Our results show that lagoonal settings dominate the early Holocene of both studied beach sections. A flooding surface associated with the Holocene maximum transgression is followed by a prograding sequence of tidal and beach deposits. Coastal progradation is evidenced in Pozm Bay, where we observe a rapid buildup of the beach ridge succession (3.5 m/years lateral propagation over the last 1950 years). Dating of Beris Beach revealed high rates of uplift, comparable to the rates obtained from the nearby Late Pleistocene marine terraces. A 3150-year-old flooding surface within the sedimentary succession of Chabahar Bay was possibly caused by rapid subsidence during an earthquake. If true, this might indicate that the Western Makran does produce large earthquakes, similar to those that have occurred further east in the Pakistani Makran.
Keywords
Makran, coastal processes, coseismic subsidence, Holocene uplift, headland-bay beach, beach progradation, earthquake
Web of science
Open Access
Yes
Create date
19/08/2019 15:50
Last modification date
11/01/2023 7:08
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