A new method for constructing Pb-210 chronology of young peat profiles sampled with low frequency

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

Geochronometria Pub Date : 2019-01-01 DOI:10.1515/GEOCHR-2015-0101

J. Sikorski

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引用次数: 5

Abstract

Abstract The paper presents the results of measurements the specific concentration of lead-210 for six peat profiles representing four peat bogs from two regions of Poland and the problem of creating age-depth models. For the construction of age-depth models, it is proposed to use mathematical functions, the best fit to the measured activity. The F-statistics were used as a measure of the match quality. The obtained models are visualized in two ways – showing the age calculated on the basis of direct measurements of activity and indicating points that are the results of the used approximation. Such visualization is important to clearly distinguish the places of the age-depth model that result from the measurements of activity from those places that are the result of the approximation used. This paper proposes and tests the application of activity modelling for the cores shorter than the range of the lead method. The paper also outlines the limitations and potential dangers related to the interpretation of core dating results i) obtained by using the activity approximation resulting in the smoothing of the age-depth profile, and ii) for the cores of a length smaller than the depth of the presence of the unsupported lead. Additionally, the proposed models were compared with the models obtained by using SIT, Mod-Age, OxCal, Clam, and Bacon programs.

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一种构建低频采样泥炭年轻剖面Pb-210年表的新方法

摘要本文介绍了代表波兰两个地区四个泥炭沼泽的六个泥炭剖面的铅210比浓度的测量结果，以及建立年龄-深度模型的问题。对于年龄深度模型的构建，建议使用最适合测量活动的数学函数。F统计数据被用来衡量比赛质量。所获得的模型以两种方式可视化——显示根据活动的直接测量计算的年龄，并指示所用近似值的结果。这种可视化对于清楚地区分由活动测量产生的年龄-深度模型的位置和由所使用的近似结果产生的位置是重要的。本文提出并测试了活动建模在短于铅法范围的岩心中的应用。该论文还概述了与岩心测年结果解释相关的局限性和潜在危险：i）通过使用活度近似值获得的年龄深度剖面的平滑，以及ii）对于长度小于无支撑铅存在深度的岩心。此外，将所提出的模型与使用SIT、Mod-Age、OxCal、Clam和Bacon程序获得的模型进行了比较。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.