Dating of Quaternary with ESR, TL and OSL methods : intercomparison

用 ESR、TL 和 OSL 方法测定第四纪年代：相互比较

• 批准号: 15340172
• 负责人: TOYODA Shin
• 金额: $ 7.62万
• 依托单位: Okayama University of Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15340172/
• 关键词: ESR; TL; OSL; dating; quaternary; tephra; natural radiation; quartz

ESR(electron spin resonance), TL(thermoluminescence), and OSL(optically stimulated luminescence) dating methods, based on the same principle, have wide applications of age determination in quaternary in the range beyond that of radiocarbon method. However, these have still been considered to be viable methods. In the present project, these three methods were applied to the same tephra samples of various known ages so that the obtained ages can be compared with each other, also with the know ages. Tepharas are also appropriate samples in the present project in the aspect that they are important key layers in many geological contexts.Quartz grains were extracted from Zenigame-Menagawa, Shibahara, Shirakawa-Ten'ei, Shirakawa-Saigo, Nantai-Shichihonzakura, Ikedako, Irito Aira-Tanzawa (Irito Ignimbrite), Aira-Shiko, Aira-Iwato, Kikai-Kuzuhara, Ata-Torihama, Kuju-1, Kuju-Handa, and AT tephras. Natural accumulated doses were obtained by ESR and isothermal TL methods. It was found in the present study that OSL is not appropriate for measurement of Japanese tephras because the rate of recupelation is too large to obtain reliable accumulated doses. Natural dose rates were obtained from the concentrations of U, Th and K concentrations in the samples which were measured by the low background gamma ray spectroscopy.Isothermal TL ages were consistent well with the known ages while ESR ages are not so much inconsistent in the range younger than 100ka, but sometimes the ages were so much scattered in the samples of older ages. The problem should probably be the additive dose method where the gamma ray dose were applied to the samples to see the increase of the signal intensities which are extrapolated to the zero ordinate to obtain natural accumulated doses. Preliminary experiments on signal regeneration were performed to find the statistical errors become much smaller with this protocol.

电子自旋共振（ESR）、热释光（TL）和光释光（OSL）等方法基于相同的原理，在第四纪地质年代测定中有着广泛的应用，其应用范围超过了放射性碳法。然而，这些仍然被认为是可行的方法。在本项目中，这三种方法被应用于不同已知年龄的相同火山碎屑样品，以便获得的年龄可以相互比较，也可以与已知年龄进行比较。从Zenigame-Menagawa、Shibahara、Shirakawa-Ten'ei、Shirakawa-Saigo、Nantai-Shichihonzakura、Ikedako、Irito Aira-Tanzawa（Irito火山灰岩）、Aira-Shiko、Aira-Iwato、Kikai-Kuzuhara、Ata-Torihama、Kuju-1、Kuju-Handa和AT火山岩中提取了石英颗粒。用ESR和等温热释光方法获得了自然累积剂量。在本研究中发现，OSL是不适合测量日本tefras，因为再累积率太大，以获得可靠的累积剂量。用低本底γ能谱测量样品中U、Th和K的浓度，得到天然剂量率，等温TL年龄与已知年龄一致，ESR年龄在100 ka以前的范围内不太一致，但在较老年龄的样品中有时年龄很分散。问题可能是添加剂剂量法，其中伽马射线剂量被施加到样品上，以观察信号强度的增加，信号强度被外推到零纵坐标，以获得自然累积剂量。对信号再生进行了初步实验，发现该协议的统计误差变得更小。

项目成果

Orbital- and millennial-scale variations in Asian dust transport path to the Japan Sea

• DOI: 10.1016/j.palaeo.2006.11.027
• 发表时间: 2007-04
• 期刊: Palaeogeography, Palaeoclimatology, Palaeoecology
• 作者: K. Nagashima;R. Tada;Hiroyuki Matsui;T. Irino;A. Tani;S. Toyoda

Depositional environmental changes over the ast 30,000 years at Hosoike Moor, Okayama Prefecture, Western Japan

日本西部冈山县细池沼泽近 3 万年来的沉积环境变化

• 发表时间: 2005
• 期刊: Journal of Geography 114

Mineral Composition of Clay Fractions and Oxygen Vacancies in Silt-Sized Quartz in Soils on the Ka-Etsu Plateau, Fukui, Central Japan—Possibility of Eolian Dust Brought from Northern Asia as Parent Material of Soils

• DOI: 10.1111/j.1747-0765.2005.tb00139.x
• 发表时间: 2005-12
• 期刊: Soil Science and Plant Nutrition
• 影响因子: 2
• 作者: Y. Kitagawa;H. Imoto;M. Saito;H. Kurihara;Kohtaro Fujie;S. Toyoda;T. Naruse

S.Toyoda: "Formation and decay of the E_1' center and its precursor in natural quartz : basics and applications"Appl.Radiat.Isot.. (In press).

S.Toyoda：“天然石英中 E_1 中心及其前体的形成和衰变：基础知识和应用”Appl.Radiat.Isot..（正在出版）。

S.Toyoda, C.Falgueres: "The method to represent the ESR signal intensity of the aluminum hole center in quartz for the purpose of dating"Adv.ESR Appl.. 20. 7-10 (2003)

S.Toyoda, C.Falgueres：“为了测年目的而表示石英中铝孔中心的 ESR 信号强度的方法”Adv.ESR Appl.. 20. 7-10 (2003)