RESEARCH PAPER
Determination of Slip-Rate by Optical Dating of Lake Bed Sediments from the Dasht-E-Bayaz Fault, Ne Iran
1
Institute of Geophysics, Tehran University, Kargar Shomali, Tehran, Iran
2
The School of Geography, University of Oxford, south park road, Oxford OX1 3QY, UK
3
Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3AN, UK
4
Department of geology, Birjand University, P.o.Box 131, Birjand, Iran
5
Geological Survey of Iran, Azadi Square, Meraj Avenue, P.O. Box 11365-4563, Tehran, Iran
Submission date: 2014-09-27
Acceptance date: 2015-04-09
Online publication date: 2015-10-15
Geochronometria 2015;42(1):148-157
KEYWORDS
ABSTRACT
The Dasht-e-Bayaz left-lateral strike-slip fault in northeastern Iran ruptured in two destructive earthquakes in 1968 and 1979. The western half of the Dasht-e-Bayaz fault cuts across the dry lake-bed in the Nimbluk valley and has no measurable relief except for at a few localised jogs in the fault trace. We provide the first quantitative constraint on the slip-rate of the Dasht-e-Bayaz fault averaged over the Holocene. The western part of the fault cuts across the Nimbluk valley; the flat surface of which is composed of lake-bed sediments. Small streams cut into the surface of the lake-beds are displaced across the fault by 26 ± 2 m. Two OSL samples of the lake-bed sediments are success-fully dated at 8.6 ± 0.6 and 8.5 ± 1.0 ka, from which we calculate a minimum slip-rate of 2.6 mm/yr. This minimum slip rate remains constant with the previously proposed Holocene slip rate of 2.5 mm/yr and within the range of the Holocene slip rate of 2.4 ± 0.3 mm/yr estimated before on the central section of the Doruneh fault.
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| ISSN: | 1733-8387 |
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