Isotope- and REE-Characterization of Groundwater Aquifers
0
Citation
42
Reference
10
Related Paper
Abstract:
This PhD thesis investigates the application of isotope techniques in groundwater aquifers, with the main focus on systematic variations of the Strontium (Sr) isotopes and chemical composition including fractionation patterns of rare earth elements (REE). This thesis is subdivided into five chapters. After the introduction, in the second chapter (chapter 2), an attempt is made to assess the efficiency of the Aquifer Storage and Recovery Project (ASR) by using isotope tracers, such as strontium and stable isotope and to prove the suitability of natural tracers to follow up the artificial recharge process. The results showed that the change in 87Sr/86Sr ratios could be observed during an artificial recharge due to the different isotopic fingerprint of surface water and groundwater. However, the flow direction of the injected water cannot be clearly interpreted because of the limited number of monitoring wells, small distance between each monitoring well and the short duration of injection. In chapter 3, the investigation of variations of the isotopic and chemical composition as well as fractionation patterns of rare earth elements (REE) of three different aquifers at Äspö Hard Rock Laboratory has been carried out over five years. The aims of this study are to identify the possible end-members of groundwater composition and to increase understanding about groundwater evolution of paleo-groundwater in this area as well as the effect of tunnel building on internal mixing of groundwater and chemical change. The Sr-data and REE patterns show especially the long-term groundwater-rock interaction and δ18O values indicate the presence of glacial meltwater in the deep aquifer. Significant chemical changes caused by internal mixing processes or present microbial activity were not observed during the five years of investigation. In chapter 4, we make an effort to clarify the hydrochemical behavior of the CO2-rich groundwaters and identify possible sources of their CO2 in Southern Thailand by analyses of major elements, REE and isotopic composition (3H, δ13C, 87Sr/86Sr). The results show that these CO2-rich groundwaters are characterized by high contents of HCO3-, SO42-, Cl-, Total Dissolved Solid (TDS), Ca2+, Mg2+, K+, Sr2+ and Ba2+. Upper continental crust (UCC) normalized REE patterns show a slight heavy REE (HREE) enrichment with high positive Eu anomalies and they show a specific high 87Sr/86Sr ratio of 0.726, The 3H amount indicates that IV CO2-rich groundwaters are submodern groundwater, which were recharged before 1950s; whereas non-CO2-rich groundwaters in the same area show higher amount of 3H (1.50-1.57 TU), which indicates mixing of submodern and modern groundwater. While the δ13C values indicate a deep seated mantel source for CO2. In the future, the attempt is made to combine isotope techniques and modeling techniques together to optimize isotope data as a powerful forecasting tool for a better groundwater management.Keywords:
Isotopes of strontium
Isotopic signature
Isotopes of strontium
Isotope Analysis
Biogeochemical Cycle
Cite
Citations (56)
Stable strontium isotope,one of the non-traditional stable isotopes,has been focused on in isotope geochemistry since last ten years and has become one of the exciting frontier sciences in geo-scientific studies.Strontium has four stable isotopes:84Sr,86Sr,87Sr and 88Sr.TIMS or MC-ICP-MS can be employed to measure stable strontium isotopes,and the ratios are expressed as δ88/86Sr.Variations in δ88/86Sr in nature range from-1.73‰ to 0.66‰.The factors affecting strontium fractionation are indistinct,and more work needs to be done on the fractionation mechanism for further understanding.At present the applications of stable strontium isotope geochemistry are presented as follows:(1) Paleoceanographic temperaure reconstruction based on δ88/86Sr of cold-water corals;(2) combining radiogenic strontium and stable strontium fractionation to study geochemical cycling in the ocean;(3) paleodietary research with stable strontium in bones.
Isotopes of strontium
Radiogenic nuclide
Isotope Geochemistry
Isotopic signature
Cite
Citations (0)
87 Sr/ 86 Sr isotopic ratios are widely used to identify strontium sources and study strontium behaviour in(bio)geochemical cycles. 87 Sr/ 86 Sr 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 87 Sr/ 86 Sr 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 87 Sr/ 86 Sr 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 87 Sr/ 86 Sr isotopic ratios have been determined, and their variations have been analyzed. 87 Sr/ 86 Sr 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.
Isotopes of strontium
Radiogenic nuclide
Cite
Citations (1)
Carbonatite
Isotopes of strontium
Table (database)
Cite
Citations (13)
A detailed record of the strontium-87 to strontium-86 ratio in seawater during the last 100 million years was determined by measuring this ratio in 137 well-preserved and well-dated fossil foraminifera samples. Sample preservation was evaluated from scanning electron microscopy studies, measured strontium-calcium ratios, and pore water strontium isotope ratios. The evolution of the strontium isotopic ratio in seawater offers a means to evaluate long-term changes in the global strontium isotope mass balance. Results show that the marine strontium isotope composition can be used for correlating and dating well-preserved authigenic marine sediments throughout much of the Cenozoic to a precision of ±1 million years. The strontium-87 to strontium-86 ratio in seawater increased sharply across the Cretaceous/Tertiary boundary, but this feature is not readily explained as strontium input from a bolide impact on land.
Isotopes of strontium
Cite
Citations (430)
As part of a study of the chemical composition and strontium isotopic composition of sediment deposited in the Ross Sea of Antarctica, samples from unit 1 of Deep Sea Drilling Project (DSDP) site 270 were analyzed. The site is located at 77/sup 0/26.48'S. 178/sup 0/30.19'W. It was found that the strontium-87/strontium-86 ratios of the noncarbonate fractions of the sediment increase linearly with the reciprocals of the strontium concentration. This relationship indicates that the sediment is a mixture of two components having differing strontium-87/strontium-86 ratios and strontium concentrations. Analytical results are presented. (JGB)
Isotopes of strontium
Strontium-90
Cite
Citations (0)
Isotopes of strontium
Cite
Citations (0)
From a sector within an extended Tertiary basin 21 groundwater samples as well as 3 rock samples of a Zechslein diapir were analysed for 87Sr/86Sr-ralio. As a tendency the isotope ratio of the dissolved strontium is decreasing with increasing depth and strontium content. Furthermore, strontium content and salinity are correlated. With two exceptions the isotope data are in the range between about 0.7080 and 0.7100. Significant differences in the strontium isotope composition were found between the Zechstein salts and the typical groundwaters. This shows, that the Zechstein diapir can not be the source of the higher salinity in parts of the groundwater system. The results are discussed.
Isotopes of strontium
Cite
Citations (1)
Nineteen pore-water samples from the late Miocene and younger marine formations were analyzed for strontium contents and isotopic compositions. All samples have /sup 87/Sr//sup 86/Sr ratios lower than the late Miocene seawater value (0.7090). The strontium values in many of these waters reflect silicate rather than carbonate reactions. In general, the strontium contents and isotopic ratios of the pore waters are related to the depth and location of the oil fields. The strontium contents as a whole show a tendency to increase with depth, although /sup 87/Sr//sup 86/Sr ratios have no simple depth relationship. The strontium contents and isotopic compositions of the pore waters fall into five groups related to geographic locations. This suggests localized evolution of pore waters in a given area and limited movement of these subsurface waters.
Isotopes of strontium
San Joaquin
Strontium-90
Cite
Citations (0)
Abstract. Strontium isotope ratios (87Sr/86Sr) of biogenic carbonates such as bones and teeth reflect the local sources of strontium ingested as food and drink during their formation. This has led to the use of strontium isotope ratios as a geochemical tracer in a wide range of fields including archaeology, ecology, food studies and forensic sciences. In order to utilise strontium as a geochemical tracer, baseline data of bioavailable 87Sr/86Sr in the region of interest is required, and a growing number of studies have developed reference maps for this purpose in various geographic regions, and over varying scales. This study presents a new data set of bioavailable strontium isotope ratios across Israel, from rock and soil samples. This data set may be viewed and accessed both in an Open Science Framework repository (doi:10.17605/OSF.IO/XKJ5Y (Moffat et al., 2020)) or via the IRHUM (Isotopic Reconstruction of Human Migration) database (Willmes et al. 2014).
Isotopes of strontium
TRACER
Cite
Citations (2)