Establishing a common standardised growth curve for single-aliquot OSL dating of quartz from sediments in the Jilantai area of North China

IF 1.2 4区地球科学 Q3 Earth and Planetary Sciences

Geochronometria Pub Date : 2020-01-01 DOI:10.2478/geochr-2020-0017

Zhenjun Li, Xuesong Mou, Yuxin Fan, Qingsong Zhang, Guangliang Yang, Hui Zhao

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引用次数: 0

Abstract

Abstract Establishing a common standardised growth curve (SGC) can substantially reduce the instrumental time for equivalent-dose (De) measurements in optically stimulated luminescence (OSL) dating. Several studies have indicated that different samples have different dose–response curves (DRCs) and therefore that it is difficult to construct a common SGC, although an SGC has been proposed in some cases. In this study, our aims were to construct a regional SGC based on small aliquots of sedimentary quartz from more than 100 samples from different sedimentary environments in the Jilantai Basin in North China and to investigate the applicability of different methods of establishing an SGC for the area. The precision of the De values of aliquots which were obtained using the SGC was compared with those obtained using the single-aliquot regenerative (SAR) protocol. Our results indicate the following: (1) for establishing an SGC using the regenerative normalisation (Re-SGC) method, selecting a suitable re-normalisation dose that is close to double the characteristic saturation dose, 2D0, can reduce the inter-aliquot/inter-sample variation in the form of DRCs within a larger dose range. (2) A common regional SGC can be established for the Jilantai area using the Re-SGC and least-squares normalisation (LS-SGC) methods, which provides reliable dating results within the 200 Gy De range.

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吉林台地区沉积物中石英单等分OSL测年通用标准化生长曲线的建立

摘要建立一个通用的标准化生长曲线(SGC)可以大大减少光激发发光(OSL)测年中等效剂量(De)测量的仪器时间。一些研究表明，不同的样品具有不同的剂量-反应曲线(DRCs)，因此很难构建一个共同的SGC，尽管在某些情况下已经提出了SGC。本研究旨在利用冀兰台盆地不同沉积环境下100多个样品的沉积石英小等分，构建区域SGC，并探讨不同方法在该地区的适用性。比较了用SGC法获得的等分De值与用单等分再生法获得的等分De值的精度。结果表明:(1)采用再生正规化(Re-SGC)方法建立SGC时，选择合适的再正规化剂量，即接近特征饱和剂量的两倍(2D0)，可以在较大的剂量范围内减少相同/样品间的dc变化。(2)利用Re-SGC和最小二乘归一化(LS-SGC)方法，可以在吉兰台地区建立一个共同的区域SGC，在200 Gy De范围内提供了可靠的测年结果。

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来源期刊

Geochronometria 地学-地球科学综合

CiteScore

2.20

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Geochronometria is aimed at integrating scientists developing different methods of absolute chronology and using them in different fields of earth and other natural sciences and archaeology. The methods in use are e.g. radiocarbon, stable isotopes, isotopes of natural decay series, optically stimulated luminescence, thermoluminescence, EPR/ESR, dendrochronology, varve chronology. The journal publishes papers that are devoted to developing the dating methods as well as studies concentrating on their applications in geology, palaeoclimatology, palaeobiology, palaeohydrology, geocgraphy and archaeology etc.