Application of 239,240 Pu, 137Cs and heavy metals for dating of river sediments

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

Geochronometria Pub Date : 2019-01-01 DOI:10.1515/geochr-2015-0111

D. Ciszewski, E. Łokas

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引用次数: 3

Abstract

Abstract The periodical nature of overbank sediment accumulation makes their detailed dating much more difficult than dating sediments in water reservoirs. To improve the commonly used dating with 137Cs, we combined this method with Pu isotopes and heavy metals in order to date sediments of the Chechło River (southern Poland), which was polluted by a lead-zinc mine. We analyzed 137Cs, Pu isotopes and heavy metal concentrations in three profiles of overbank sediments and in two profiles of subsidence basins in the lower river reach. The results indicate a lower accuracy and higher uncertainty of the overbank than the dating of reservoir sediments. The application of plutonium isotopes provided very important information validating caesium peaks or providing the principal information regarding horizons dated with heavy metals. The obtained dates give the earliest possible age of particular horizons with the actual sediment deposition delayed by several to a dozen years. This investigation shows that using plutonium radioisotopes can be a useful tool for dating, particularly of the youngest overbank sediments where numerous sedimentation gaps cause uncertainties in the application of other methods, e.g. radiocaesium and heavy metals.

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239,240 Pu, 137Cs和重金属在河流沉积物测年中的应用

摘要河岸沉积物堆积的周期性使其详细测年比水库沉积物测年困难得多。为了改进常用的137Cs测年方法，我们将这种方法与钚同位素和重金属相结合，以确定被铅锌矿污染的切赫沃河（波兰南部）沉积物的年代。我们分析了长江下游三个岸上沉积物剖面和两个沉降盆地剖面中的137Cs、Pu同位素和重金属浓度。结果表明，与储层沉积物的年代测定相比，超岸的精度较低，不确定性较高。钚同位素的应用提供了非常重要的信息，证实了铯峰，或提供了有关用重金属测年的层位的主要信息。所获得的日期给出了特定层位的最早年龄，实际沉积物沉积延迟了几十年。这项调查表明，使用钚放射性同位素可以作为一种有用的测年工具，特别是对最年轻的河岸沉积物，在这些沉积物中，大量的沉积间隙导致其他方法（如放射性铯和重金属）的应用不确定。

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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.