Investigation on the Potential of OSL for Dating Qanat in the Dasht-e Bayaz Region of Northeastern Iran Using the SAR Protocol for Quartz

  • سال انتشار: 1390
  • محل انتشار: فصلنامه زلزله شناسی و مهندسی زلزله، دوره: 13، شماره: 2
  • کد COI اختصاصی: JR_JSEE-13-2_001
  • زبان مقاله: انگلیسی
  • تعداد مشاهده: 247
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نویسندگان

M. Fattahi

Oxford University Center for the Environment

A. Aqazadeh

Institute of Geophysics, University of Tehran

R.T. Walker

University of Oxford

M. Talebian

Geological Survey of Iran, Tehran

R.A. Sloan

University of Cambridge

M.M. Khatib

Birjand University

چکیده

In some parts of Iran, such as Dasht-e-Bayaz, the line of wells of the Qanat systems have been displaced by coseismic faulting. If we can date the age of these Qanat wells and measure the amount of offset, we will be able to estimate the slip-rate of the fault. The existing constraints on age of ancient Qanats in Iran are typically assigned from archaeological investigations of nearby habitation sites. We present for the first time the results of OSL dating from spoil deposits associated with the Dasht-e-Bayaz Qanat. We further explore the possibility of dating Qanat directly using the novel method of OSL. The minimum ages which are assigned to maintenance and construction of Dasht-e-Bayaz Qanat, using SAR protocol are ۱۵.۸±۱.۶ka and ۲۲.۱±۲.۷ka, respectively. Archeological investigations suggest that the Qanat ages are much younger than ages obtained by OSL. We present evidence that the SAR approach that we have chosen is operative but not relevant. The OSL method has provided ages that are consistent with stratigraphic layers in the well, but these layers were not fully bleached during construction. The single aliquot method to which dim samples we've applied in the recent research is not an efficacious way to achieve the age of Qanats and may need to test for more samples.

کلیدواژه ها

Qanat, OSL Dating, Dasht-e-Bayaz Fault, SAR

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