Dating of Quaternary with ESR, TL and OSL methods : intercomparison
Dating of Quaternary with ESR, TL and OSL methods : intercomparison
批准号:
15340172
负责人:
TOYODA Shin
金额:
$7.62万
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
项目状态:
已结题
起止时间:
2003 至 2005
中文摘要
基于相同原理的ESR(电子自旋共振)、TL(热释光)和OSL(光激发光)测年方法在第四纪年龄测定方面有着比放射性碳法更广泛的应用。然而,这些仍然被认为是可行的方法。在本项目中,这三种方法应用于不同已知年龄的相同火山灰样本,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。 Tepharas 也是本项目中的合适样本,因为它们是许多地质环境中的重要关键层。石英颗粒提取自 Zenigame-Menakawa、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 和 AT tephras。通过ESR和等温TL方法获得自然累积剂量。本研究发现,OSL 不适合测量日本火山灰,因为恢复率太大,无法获得可靠的累积剂量。自然剂量率是通过低背景伽马射线能谱测量的样品中的U、Th和K浓度获得的。等温TL年龄与已知年龄一致,而ESR年龄在100ka以下范围内没有那么不一致,但有时年龄较大的样品中年龄非常分散。问题可能应该是附加剂量方法,其中将伽马射线剂量应用于样本以观察信号强度的增加,并将信号强度外推到零纵坐标以获得自然累积剂量。进行了信号再生的初步实验,发现该协议的统计误差变得更小。
英文摘要
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.
期刊论文(23)
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DOI:
10.1016/j.palaeo.2006.11.027
发表时间:
2007-04
期刊:
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子:
--
作者:
[K. Nagashima;R. Tada;Hiroyuki Matsui;T. Irino;A. Tani;S. Toyoda]
通讯作者:
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
DOI:
--
发表时间:
2005
期刊:
Journal of Geography 114
影响因子:
--
作者:
[]
通讯作者:
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]
通讯作者:
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)。
DOI:
--
发表时间:
期刊:
影响因子:
--
作者:
[]
通讯作者:
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)
DOI:
--
发表时间:
期刊:
影响因子:
--
作者:
[]
通讯作者:
共 16 条
Paramagnetic defects and crystallinity index as the proxies for provenance of Earth surface sediment transportation
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批准号:23510017
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依托单位:
Distribution of the radiation dose of mammal teeth from South Ural region contaminated by a radiation accident in former Soviet Union
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Distribution of the radiation doses in South Urals of former Soviet Union investigated by Electron Spin Resonance dosimetry of mammal teeth
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项目类别:Grant-in-Aid for Scientific Research (B)
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资助金额:$6.02万
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财政年份:2001
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负责人:TOYODA Shin
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依托单位:
国内基金
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