Optically Stimulated Luminescence Dating in Earthquake Research: Applications of the SAR Protocol in Quartz Minerals

Year 2024, , 59 - 76, 26.06.2024

Mehmet Yüksel

https://doi.org/10.24232/jmd.1482238

Abstract

Optically stimulated luminescence (OSL) dating is one of the most important methods in paleoseismology studies to calculate the ages of samples taken from fault segments over a wide range of up to 1 million years. Basically, the time when the samples last saw daylight can be calculated with the OSL method. The natural radiation energy that minerals such as quartz, feldspar, etc., which are abundant in the soil, accumulate during their burial is the data source of the OSL dating method. In this study, general information and important points to be considered about the processes of opening trenches, taking OSL samples and making age calculations are emphasized; and then experimental studies are included. OSL ages were calculated by determining the equivalent doses of quartz samples aged in the laboratory (M1: 940±65.8 years, M2: 6230±323.96 years, M3: 24000±715 years) using the single aliquot regeneration (SAR) protocol, and statistical evaluations were made for the calculation of age errors.

Keywords

Earthquake, OSL Dating, Paleoseismology, SAR Protocol, Age statistics

Deprem Araştırmalarında Optik Uyarmalı Lüminesans Tarihlendirme: Kuvars Minerallerinde SAR Protokolü Uygulamaları

Abstract

Optik uyarmalı lüminesans (OSL) tarihlendirme, paleosismoloji çalışmalarında fay segmentlerinden alınan örneklerin yaşlarını 1 milyon yıla kadar geniş bir aralıkta hesaplamak için kullanılan en önemli yöntemlerden biridir. Temel olarak OSL yöntemi ile örneklerin gün ışığını en son gördükleri zaman hesaplanabilmektedir. Toprakta bol miktarda bulunan kuvars, feldspat vb. minerallerin gömülü oldukları süre boyunca biriktirdikleri doğal radyasyon enerjisi OSL tarihlendirme yönteminin veri kaynağını oluşturmaktadır. Bu çalışmada, hendeklerin açılması, OSL örneklerinin alınması ve yaş hesaplamalarının yapılması süreçleri ile ilgili genel bilgiler ve dikkat edilmesi gereken önemli noktalara vurgu yapılmış ve daha sonra deneysel çalışmalara yer verilmiştir. Deneysel çalışmalarla laboratuvar ortamında yaşlandırılan (M1: 940±65.8 yıl, M2: 6230±323.96 yıl, M3: 24000±715 yıl) kuvars örneklerinin tek tablet doz yenileme (SAR) protokolü ile eşdeğer dozları belirlenerek OSL yaşları hesaplanmış ve yaşa karışan hataların hesaplanması ile ilgili istatistiksel değerlendirmeler yapılmıştır.

Keywords

Deprem, OSL Tarihlendirme, Paleosismoloji, SAR Protokolü, Yaş istatistiği

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