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بررسی پتانسیل لومینسانس تحریک‌شده با اشعه مادون‌قرمز جهت سنیابی سنگ‌های واریزهای زمین‌لغزش فتلک | ||
| فیزیک زمین و فضا | ||
| مقاله 6، دوره 48، شماره 3، آذر 1401، صفحه 593-609 اصل مقاله (7.58 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/jesphys.2022.336792.1007398 | ||
| نویسندگان | ||
| نسرین کریمی موید* 1؛ مرتضی فتاحی2؛ رضا صحبتی3؛ ابراهیم حق شناس4؛ وحید تاجیک5؛ ضیاءالدین شعاعی6؛ اندرو ماری7 | ||
| 1دانشجوی دکتری، گروه زلزله‌شناسی، مؤسسه ژئوفیزیک، دانشگاه تهران، تهران، ایران | ||
| 2دانشیار، گروه زلزله‌شناسی، مؤسسه ژئوفیزیک، دانشگاه تهران، تهران، ایران | ||
| 3پژوهشگر، آزمایشگاه ریزو، دانشکده فیزیک، دانشگاه فنی دانمارک، رزکیلده، دانمارک | ||
| 4استادیار، پژوهشگاه بین المللی زلزله‌شناسی و مهندسی زلزله، تهران، ایران | ||
| 5کارشناس، پژوهشگاه بین المللی زلزله‌شناسی و مهندسی زلزله، تهران، ایران | ||
| 6دانشیار، مؤسسه تحقیقات حفاظت خاک و آبخیزداری، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران | ||
| 7استاد، آزمایشگاه سنیابی لومینسانس نوردیک، دانشکده علوم زمین، دانشگاه آرهوس، رزکیلده، دانمارک | ||
| چکیده | ||
| طی دهه گذشته روش نوینی جهت سنیابی سطوح سنگی با استفاده از سیگنال لومینسانس تحریک‌شده با اشعه مادون‌قرمز ارائه شد. این روش بر پایه نمودار لومینسانس-عمق است که در آن با افزایش مدت‌زمانی که سنگ در معرض نور خورشید قرار میگیرد عمق نفوذ نور به داخل سنگ افزایش و سیگنال لومینسانس موجود در سنگ کاهش مییابد. با استفاده از این رویکرد، سایتهای مختلفی از جمله در ایتالیا و دانمارک با موفقیت سنیابی شدهاند. لذا در این پژوهش امکان سنیابی نمونههای سنگی واریزهای ناشی از زمین‌لغزش فتلک به‌کمک این روش مورد بررسی قرار گرفت. اما متأسفانه نتایج حاصل از نمونه فتلک منطبق با مدل ارائه شده نبود و تعیین سن انجام نشد. از این‌رو نمونههای سنگی از سایتی در اسپانیا برداشت شد تا با همان روشهای آزمایشگاهی که نمونه فتلک مطالعه شد مورد سنیابی قرار گیرند که نتایج با مدل همخوانی داشت. اطلاعات حاصل از این پژوهش نشان داد که مراحل نمونه‌برداری و انجام آزمایشات به‌طور صحیح انجام شده است و روش به درستی عمل میکند اما مشکل اصلی در ذات و حساسیت نمونههای برداشت شده از منطقه فتلک جهت تولید لومینسانس است. | ||
| کلیدواژه‌ها | ||
| سنیابی سنگ؛ لومینسانس نوری مادون‌قرمز؛ نمودار لومینسانس-عمق؛ زلزله رودبار-منجیل؛ زمین‌لغزش فتلک | ||
| عنوان مقاله [English] | ||
| Investigating the Potential of Infrared Stimulated Luminescence for Dating the Debris rocks of Fatalak Landslide | ||
| نویسندگان [English] | ||
| Nasrin Karimi Moayed1؛ Morteza Fattahi2؛ Reza Sohbati3؛ Ebrahim Haghshenas4؛ Vahid Tajik5؛ Zieaoddin Shoaei6؛ Andrew Murray7 | ||
| 1Ph.D. Student, Department of Seismology, Institute of Geophysics, University of Tehran, Tehran, Iran | ||
| 2Associate Professor, Department of Seismology, Institute of Geophysics, University of Tehran, Tehran, Iran | ||
| 3Researcher, Risø Campus, Faculty of Physics, Technical University of Denmark, Roskilde, Denmark | ||
| 4Assistant Professor, International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran | ||
| 5Expert, International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran | ||
| 6Associate Professor, Soil Conservation and Watershed Management Research Institute, Agricultural Research Education And Extention Organization, Tehran, Iran | ||
| 7Professor, Nordic Laboratory for Luminescence Dating, Faculty of Geoscience, Aarhus University, Roskilde, Denmark | ||
| چکیده [English] | ||
| Over the last decade, extensive studies have been done to date rock surfaces using optical luminescence signals, and recently a model has been proposed showing that shows the rock surfaces using infrared-stimulated luminescence signal have been successfully dated. This method is based on the resetting of luminescence signal with depth into rock surfaces. When a rock surface is first exposed to sunlight, the luminescence signal that has been stored over time in its constituent minerals (particularly quartz and feldspar) starts to decrease. The longer the rock is exposed to sunlight, the depth of light penetration into the rock also increases and the luminescence signal in the rock decreases, however, the rate of luminescence resetting reduces with depth because of the attenuation of daylight into the rock surface. This differential change in bleaching rate with depth leads to the development of a sigmoidal shape luminescence-depth profile. Such profile provides an internal check on an inadequate daylight exposure, and therefore an incomplete resetting of the luminescence signal and allow us to identify the sample that are most likely to provide reliable OSL age. In this study, we investigated the potential of this method to date debris rocks of Fatalak landslide which were induced by Rudbar-Manjil earthquake in north of Iran in 1990. Cores of ~10 cm long and 1 cm diameter were extracted from the buried and exposed sides of the rock samples using a water-cooled, diamond-tipped drill. The cores were then cut into ~1.5 mm thick slices. The slices were gently broken into small chips and mounted in 10-mm diameter stainless steel cups for natural luminescence signal and dose response measurements. All sub-samples from each slice were stimulated by infrared radiation and the blue and ultraviolet luminescence signals were measured. To determine whether the luminescence signals at the buried surface of the rock were sufficiently bleached before the earthquake event, we measured the natural sensitivity-corrected IR50 and pIRIR225 signals (Ln/Tn) with depth into the core and the luminescence-depth profiles were plotted. Unexpectedly, weak or no IR50 and pIRIR225 signals and no suitable luminescence-depth profiles were observed. According to the experience of the second author, almost all sediment samples taken from Iran have generated IRSL signal, so it is necessary to investigate the cause of the lack of a suitable IRSL signal for rock samples in Fatalak. Due to the fact that with increasing depth, the bleaching rate decreases and the luminescence signal intensity increases and also the luminescence signal is generated by a small percentage (approximately 10%) of the grains of the dosimeter grains (mainly quartz and feldspar), it is possible to produce signals (response to the same dose) with different intensities and properties for different slices. Therefore, the potential of all slices to produce the signal and finally to prepare the luminescence-depth profile were investigated. Unfortunately, this profile did not match the profiles provided by previous studies. In order to analyze whether this observation is due to the nature of the samples taken from Iran or there was a defect in the luminescence signal measuring device or in the experiment process, we performed similar tests for a rock surface which was taken from another site. The same process was then carried out for two rock art paintings from Spain, which showed acceptable signals and the IR50 depth profile showed a sigmoidal shape where the luminescence signal was almost reset at the surface slice but increased with depth until it reached saturation, as expected from the model. Then, the luminescence-depth profiles from Fatalak and Spain sites were compared with two previous successful studies in Italy and Denmark. The IRSL luminescence-depth profile for rock art sample in Spain was in a good agreement with that of the two burial samples from Italy and Denmark. However, no such correlation was observed between the profiles of the Fatalak sample and the profiles of the two Italian and Danish samples. As the profiles derived for Fatalak sample were not consistent with the model and none of the previous studies, we could not determine the time of the landslide event in the conventional method. | ||
| کلیدواژه‌ها [English] | ||
| Rock surface dating, IRSL, Luminescence-depth profile, Rudbar-Manjl earthquake, Fatalak landslide | ||
| مراجع | ||
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سایت سازمان زمین شناسی و اکتشافات کشوری. https://gsi.ir/fa
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