8787Sr/86Sr ISOTOPE RATIOS IN THE RIVER WATERS OF THE SOUTHERN URALS

IF 0.8 Q4 GEOCHEMISTRY & GEOPHYSICS Geodynamics & Tectonophysics Pub Date : 2022-02-10 DOI:10.5800/gt-2022-13-2s-0602

D. Kiseleva, E. Shagalov, T. G. Okuneva, N. Soloshenko, А. D. Ryanskaya, E. A. Pankrushina, S. Karpova, K. K. Urazov, A. R. Sidoruk

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Abstract

87Sr/86Sr isotopic ratios are widely used to identify strontium sources and study strontium behaviour in(bio)geochemical cycles. 87Sr/86Sr in surface waters can reflect the average composition of bioavailable (i.e. available forfurther absorption by plants and animals) strontium in the catchment specific area. Based on those 87Sr/86Sr ratios, theregional maps of the bioavailable strontium distribution (strontium isoscapes) can be compiled. A complex block structurecharacterizes the Ural mountain system. Individual parts (blocks) are composed of rocks of various ages, genesis andgeochemical characteristics, which can radically change at a distance of several tens of kilometres. Such variability wouldbe reflected in strontium isotopic ratios, thus making it possible to determine the local isotopic signatures of bioavailablestrontium.This work aimed to study 87Sr/86Sr in the water in the rivers of the Southern Urals. We determined the contents andisotopic ratios of strontium in river water samples collected from the territories of the Orenburg and Chelyabinsk regionsand the Republic of Bashkortostan in 2019–2020.For the first time in the surface water of the rivers in the Southern Urals (Ural, Belaya, Tobol, Karagaily-Ayat, Sim, andothers), the 87Sr/86Sr isotopic ratios have been determined, and their variations have been analyzed. 87Sr/86Sr values varyin the range 0.70666–0.71063 (average 0.70908) for the rivers of the Urals basin, 0.70749–0.71058 (average 0.70924)for the Kama-Volga basin, 0.70946–0.71176 (average 0.71071) for the Tobol basin. Such features of the strontium isotopiccomposition may be due to the influence of underlying rocks of the catchment area drained by river water. The dataobtained can be used to identify the sources of strontium input into the water system during hydrological and environmentalstudies; to confirm the authenticity of food products of plant and animal origin; to carry out comparisons in thestudies of the migration of ancient people and animals, as well as to determine the raw material areas for the productionof vegetable and woollen textiles and wooden products in antiquity.

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乌拉尔南部河流中sr /86Sr同位素比值

87Sr/86Sr同位素比值被广泛用于识别锶来源和研究锶在(生物)地球化学循环中的行为。地表水87Sr/86Sr能反映集水区特定区域生物可利用锶(即可供动植物进一步吸收的可利用锶)的平均组成。根据这些87Sr/86Sr比值，可以编制生物有效锶的区域分布图(锶等高图)。乌拉尔山系以复杂的块体构造为特征。单个部分(块)由不同年龄、成因和地球化学特征的岩石组成，在几十公里的距离上可能发生根本变化。这种可变性将反映在锶同位素比率中，从而使确定生物可利用锶的局部同位素特征成为可能。本研究旨在研究乌拉尔南部河流中87Sr/86Sr的含量。我们测定了2019-2020年在奥伦堡、车里雅宾斯克地区和巴什科尔托斯坦共和国境内采集的河流水样中锶的含量和异位比。首次在乌拉尔南部河流(乌拉尔、贝拉亚、托波尔、卡拉加利-阿亚特、西姆等)的地表水中测定了87Sr/86Sr同位素比值，并对其变化进行了分析。87Sr/86Sr值变化范围为:乌拉尔盆地河流0.70666 ~ 0.71063(平均0.70908)，卡马-伏尔加盆地0.70749 ~ 0.71058(平均0.70924)，托博尔盆地0.70946 ~ 0.71176(平均0.71071)。锶同位素组成的这种特征可能是受河流排水集水区下伏岩石的影响。在水文和环境研究期间，获得的数据可用于确定进入水系统的锶的来源;确认动植物源性食品的真伪;在古人类和动物迁徙的研究中进行比较，并确定古代蔬菜和羊毛纺织品和木制品生产的原料区域。

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来源期刊

Geodynamics & Tectonophysics GEOCHEMISTRY & GEOPHYSICS-

CiteScore

1.20

自引率

14.30%

发文量

审稿时长

24 weeks

期刊介绍： The purpose of the journal is facilitating awareness of the international scientific community of new data on geodynamics of continental lithosphere in a wide range of geolchronological data, as well as tectonophysics as an integral part of geodynamics, in which physico-mathematical and structural-geological concepts are applied to deal with topical problems of the evolution of structures and processes taking place simultaneously in the lithosphere. Complex geological and geophysical studies of the Earth tectonosphere have been significantly enhanced in the current decade across the world. As a result, a large number of publications are developed based on thorough analyses of paleo- and modern geodynamic processes with reference to results of properly substantiated physical experiments, field data and tectonophysical calculations. Comprehensive research of that type, followed by consolidation and generalization of research results and conclusions, conforms to the start-of-the-art of the Earth’s sciences.