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Добірка наукової літератури з теми "Isotopes du Sr"

Автор: Grafiati
Опубліковано: 9 березня 2024
Оновлено: 25 травня 2024

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Статті в журналах з теми "Isotopes du Sr"

1

Kennedy, Brian P., Joel D. Blum, Carol L. Folt, and Keith H. Nislow. "Using natural strontium isotopic signatures as fish markers: methodology and application." Canadian Journal of Fisheries and Aquatic Sciences 57, no. 11 (November 1, 2000): 2280–92. http://dx.doi.org/10.1139/f00-206.

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To distinguish Atlantic salmon (Salmo salar) populations in tributaries of the Connecticut River, we studied the incorporation and stability of Sr isotopes in juvenile salmon. We established the geologic basis for unique isotopic signatures in 29 salmon sites. Stream-specific Sr isotopic ratios (87Sr/86Sr) were found in calcified tissues of salmon parr within 3 months of stocking. We found little seasonal variation in the Sr signatures of stream water or fish tissue. There were no significant differences among the Sr signatures of otoliths, scales, and vertebrae. For mature salmon raised under constant conditions, 70% of the Sr isotopic signature in calcified tissues was derived from food sources. We developed a criterion for identifying moving fish based upon the isotopic variability of genetically marked fish. Applying this criterion to our streams, 7% of the fish in our study had incorporated Sr from multiple streams. Strontium isotopes distinguished all 8 regions in the White River basin and 7 of the 10 regions in the West River basin. When watersheds are considered together, Sr isotopes differentiated 11 unique signatures from 18 regions. We conclude that Sr isotopes are an effective marking tool and discuss ways in which they can be combined with other marking techniques over larger spatial scales.
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2

Zitek, A., J. Irrgeher, M. Cervicek, M. Horsky, M. Kletzl, T. Weismann, and T. Prohaska. "Individual-specific transgenerational marking of common carp Cyprinus carpio, L., using 86Sr/84Sr double spikes." Marine and Freshwater Research 65, no. 11 (2014): 978. http://dx.doi.org/10.1071/mf13235.

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Transgenerational isotopic marking has been recognised as an efficient tool for mass marking of high numbers of fish larvae by injecting female spawners with enriched isotope solutions. So far, mainly enriched stable barium isotopes have been applied for this purpose. Here, we present an alternative approach for individual-specific transgenerational marking using strontium 86Sr/84Sr double spikes. Four isotonic double-spike solutions with different molar fractions of 86Sr and 84Sr and different total Sr concentrations were administered to four female spawners of common carp, Cyprinus carpio, L., by intraperitoneal injection, and one additional female spawner was injected a blank isotonic solution as control. Otoliths (lapilli) were sampled from juvenile offspring and analysed for their Sr isotopic composition by laser ablation–multi collector–inductively coupled plasma–mass spectrometry. Central otolith regions of the progeny of female carps treated with concentrations of at least 0.45 mg 84Sr kg–1 bodyweight and 2.28 mg 86Sr kg–1 bodyweight showed a significant shift of the absolute 88Sr/86Sr and 88Sr/84Sr isotope ratios from the natural baseline. Isotope pattern deconvolution was successfully applied for the identification of the originally injected 86Sr/84Sr molar fraction ratios of the individual double spikes. Enriched stable Sr isotope double spikes represent an important alternative to enriched stable Ba isotopes for transgenerational marking, especially in freshwater systems.
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3

Jo, Hui Je, Hyo Min Lee, Go-Eun Kim, Won Myung Choi, and Taehoon Kim. "Determination of Sr–Nd–Pb Isotopic Ratios of Rock Reference Materials Using Column Separation Techniques and TIMS." Separations 8, no. 11 (November 10, 2021): 213. http://dx.doi.org/10.3390/separations8110213.

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Анотація:
Thermal ionization mass spectrometry (TIMS) can provide highly accurate strontium (Sr), neodymium (Nd), and lead (Pb) isotope measurements for geological and environmental samples. Traces of these isotopes are useful for understanding crustal reworking and growth. In this study, we conducted a sequential separation of Sr, Nd, and Pb and subsequently measured the 87Sr/86Sr, 143Nd/144Nd, 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb ratios of 13 widely used rock certified reference materials (CRMs), namely BCR-2, BHVO-2, GSP-2, JG-1a, HISS-1, JLk-1, JSd-1, JSd-2, JSd-3, LKSD-1, MAG-1, SGR-1, and 4353A, using TIMS. In particular, we reported the first isotopic ratios of Sr, Nd, and Pb in 4353A, Sr and Nd in HISS-1 and SGR-1, and Sr in JLk-1, JSd-2, JSd-3, and LKSD-1. The Sr–Nd–Pb isotopic compositions of most in-house CRMs were indistinguishable from previously reported values, although the Sr and Pb isotopic ratios of GSP-2, JSd-2, JSd-3, and LKSD-1 obtained in different aliquots and/or batches varied slightly. Hence, these rock reference materials can be used for monitoring the sample accuracy and assessing the quality of Sr–Nd–Pb isotope analyses.
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4

Zhang, Wen, Zhaochu Hu, Lanping Feng, Zaicong Wang, Yongsheng Liu, Yantong Feng, and Hong Liu. "Accurate Determination of Zr Isotopic Ratio in Zircons by Femtosecond Laser Ablation MC-ICP-MS with “Wet” Plasma Technique." Journal of Earth Science 33, no. 1 (February 2022): 67–75. http://dx.doi.org/10.1007/s12583-021-1535-7.

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AbstractThis work evaluates the use of femtosecond laser ablation multiple collector inductively coupled plasma mass spectrometry (fs-LA-MC-ICP-MS) for Zr isotopic analysis in zircons. The mass fractionation caused by instrumental mass discrimination was corrected by a combination of internal correction using Sr as an internal standard (coming from a NIST SRM 987 standard solution) and external correction using a matrix-matched standard. Several important instrument parameters were investigated, such as the effect of the addition of N2 and “wet” plasma condition, the mass fractionation behaviors between Zr isotopes and Sr isotopes, the position effect in laser ablation cell and the effect of laser ablation parameters (laser spot size and energy density). The Zr isotope compositions of seven zircons (GJ-1, 91500, Plešovice, Rak-17, Paki, Aus and Mala) were determined by the developed fs-LA-MC-ICP-MS and thermal ionization mass spectrometry (TIMS). Our fs-LA-MC-ICP-MS results for Zr isotope compositions agreed with TIMS analyses within analytical uncertainties, indicating the presented method is a suitable tool to resolve isotopic zoning in natural zircons. The results also suggest that GJ-1, 91500, Plešovice, Paki, Aus and Mala had the homogenous Zr isotope composition and could be considered as the potential candidates for the Zr isotope analysis in zircons, except Rak-17 which presented the large Zr isotope variation.
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5

Míková, Jitka. "Strontium isotopic composition as tracer of weathering processes, a review with respect to James Ross Island, Antarctica." Czech Polar Reports 2, no. 1 (January 1, 2012): 20–30. http://dx.doi.org/10.5817/cpr2012-1-3.

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Анотація:
Strontium isotopes (87Sr/86Sr) are routinely used to determine sources and mixing relationships in geochemical studies. They have proven to be useful in determining weathering processes and quantifying end-member mixing processes. A number of studies highlight that Sr isotopes represent a powerful tool helping to constrain weathering reactions, weathering rates, flow pathways and mixing scenarios, even when inherent differences in weathering rates of different minerals, and mineral heterogeneity in natural environments may cause difficulties in defining the weathering component of different geochemical systems. Nevertheless, Sr isotopes are useful when combined with other chemical data, to constrain models of water–rock interaction and mixing as well as geochemical processes such as weathering. This paper presents basic information about Sr isotopic system, new analytical developments, summary of recent published studies in constraining the weathering processes, and indicates studies similar to weathering in polar regions. The aim of this paper is to present rationale of using Sr isotopes as tracer of weathering processes on James Ross Island, Antarctica.
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6

Dyer-Pietras, Kuwanna. "Lake basin closure and episodic inflow as recorded by radiogenic Sr isotopes: Eocene Green River Formation in the Piceance Creek Basin, Colorado." Mountain Geologist 57, no. 4 (October 28, 2020): 355–73. http://dx.doi.org/10.31582/rmag.mg.57.4.355.

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Lacustrine basins are excellent archives of lake evolution, and deposits record the uplift and weathering histories of the surrounding terrain. The application of Sr isotopes has been tested in several lacustrine basins, both modern and ancient, based on the premise that lakes are well mixed, and shifting Sr isotopes may suggest changes in lake provenance. In the Eocene lacustrine Green River Formation in the Piceance Creek Basin of Colorado, Sr isotope analysis of carbonate mudstones indicates that radiogenic Sr in the center of the Piceance lake decreased during the evolution of the lake, from 52.8–48.4 Ma. Because deposition in the basin center occurred away from the influence of episodic alluvial inflow at the basin margin, Sr isotope evolution in the Piceance lake after basin closure is recorded in the John Savage #24-1 core deposits, not the Anvil Points deposits. Sr isotope analysis of carbonate mudstones at Anvil Points below 55 m shows fluctuating radiogenic Sr values that record episodic inflow from the White River Uplift. This inflow is responsible for the difference in radiogenic Sr trends recorded between the basin center and margin. Above 55 m, fluctuating Sr isotope values at Anvil Points record episodic inflow from the White River Uplift, without inflow of Paleozoic and Mesozoic carbonates. The boundary at 55 m records the hydrologic closure of the Uinta and Piceance lakes around 52 Ma, when lake level lowered beneath the basin sill and the lakes were no longer connected across the Douglas Creek Arch. A significant increase in radiogenic Sr across the 55-m-boundary records this transition from open to closed hydrology, reflecting a loss of dissolved Sr sourced from Paleozoic and Mesozoic carbonates.
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7

Anselment, M., S. Chongkum, K. Bekk, S. G�ring, A. Hanser, G. Meisel, and H. Rebel. "Isotope shift of a series of Sr isotopes." Zeitschrift f�r Physik D Atoms, Molecules and Clusters 3, no. 4 (December 1986): 421–22. http://dx.doi.org/10.1007/bf01437201.

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8

Munoz, Patricio Montecinos, Adriana Alves, Rogério Guitarrari Azzone, Pablo Cordenons, Sandra Morano, Walter Sproesser, and Solange de Souza. "In situ Sr isotope analyses by LA-MC-ICP-MS of igneous apatite and plagioclase from magmatic rocks at the CPGeo-USP." Brazilian Journal of Geology 46, suppl 1 (June 2016): 227–43. http://dx.doi.org/10.1590/2317-488920160032093.

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ABSTRACT: This contribution describes the successful implementation of in situ Sr isotope analyses by LA-MC-ICP-MS at the CPGeo-USP. The choice for an analytical configuration using measurements of half-masses allows the accurate assessment of lanthanide interferences, permitting the determination of Sr isotopes in important REE-rich accessory phases, such as apatite. Likewise, the on-peak-zero method effectively corrects the background contribution (both from Kr and residual Sr contributions from previous ablations) to the signals of the unknown samples. The analytical campaigns resulted in an accuracy, in respect to reference TIMS values, better than 57 ppm (~ ±0.000057 2σ SD) for a modern coral and the Batjberg clinopyroxene which impart significant quality to our data. Similarly, the majority of the stable Sr isotope ratios are close to the accepted values, which also confirms the effectiveness of the method. The achieved accuracy allows the identification and investigation of spatially-controlled isotopic heterogeneities on the micrometric scale in several Sr-rich minerals (apatite, carbonates, plagioclase, and clinopyroxene) with important implications to the understanding of relevant geochemical processes, particularly AFC, source geochemical heterogeneities and magma-mixing.
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9

Gregorčič, Staša Hamzić, Nives Ogrinc, Russell Frew, Marijan Nečemer, Lidija Strojnik, and Tea Zuliani. "The Provenance of Slovenian Milk Using 87Sr/86Sr Isotope Ratios." Foods 10, no. 8 (July 27, 2021): 1729. http://dx.doi.org/10.3390/foods10081729.

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This work presents the first use of Sr isotope ratios for determining the provenance of bovine milk from different regions of Slovenia. The analytical protocol for the determination of 87Sr/86Sr isotope ratio was optimised and applied to authentic milk samples. Considerable variability of 87Sr/86Sr ratios found in Slovenian milk reflects the substantial heterogeneity of the geological background of its origin. The results, although promising, cannot discount possible inter-annual or annual variation of the Sr isotopic composition of milk. The 87Sr/86Sr ratios of groundwater and surface waters are in good correlation with milk, indicating that the Sr isotopic fingerprint in milk is reflective of cow drinking water. The 87Sr/86Sr ratio has the potential to distinguish between different milk production areas as long as these areas are characterised by geo-lithology. Discriminant analysis (DA) incorporating the elemental composition and stable isotopes of light elements showed that 87Sr/86Sr ratio together with δ13Ccas and δ15Ncas values have the main discrimination power to distinguish the Quaternary group (group 6) from the others. Group 1 (Cretaceous: Carbonate Rocks and Flysch) is associated with Br content, 1/Sr and δ18Ow values. The overall prediction ability was found to be 63.5%. Pairwise comparisons using OPLS-DA confirmed that diet and geologic parameters are important for the separation.
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10

Rao, Can, Ru-Cheng Wang, Frédéric Hatert, Run-Qiu Wu, and Qi Wang. "Mineralogy and Geochemistry of Sr-Bearing Phosphates from the Nanping No. 31 Pegmatite (SE China): Implications for Sr Circulation and Post-Magmatic Processes in Granitic Systems." Minerals 10, no. 6 (June 16, 2020): 541. http://dx.doi.org/10.3390/min10060541.

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Although Rb/Sr ratio and Sr isotopes are routinely modeled to determine petrogenetic processes and sources for granitic systems, the post-magmatic path and crystallization of Sr in granitic systems have not been thoroughly elucidated to date. In this study, we present the petrography, chemical composition and isotopic 87Sr/86 of Sr-bearing phosphates from the Nanping No. 31 pegmatite in Southeastern China, helping to characterize post-magmatic stages and geochemical recirculation of Sr in granitic systems. K-feldspar and primary apatites occur as major “primary Sr minerals”, the occurrences of secondary Sr phosphates (strontiohurlbutite, palermoite and goyazite) and Sr-rich phosphates (apatites, hurlbutite, bertossaite and fluorarrojadite-(BaNa)) reflect the transport, concentration and recrystallization of Sr in granitic systems. The mobilization and recrystallization of Sr in granitic systems are mainly controlled by the variation in alkalinity of hydrothermal fluids. Two post-magmatic recirculations of Sr are proposed in the Nanping No. 31 pegmatite: (1) breakdown of the “primary Sr mineral” (K-feldspar and primary apatites) and crystallization of secondary Sr-bearing phases; and (2) replacement of secondary Sr-bearing phosphates and direct precipitation of later palermoite and goyazite from later Sr-rich fluids at low temperatures. The Sr isotope features of Sr-bearing phosphates suggest that the emplacement and consolidation processes of the Nanping pegmatite involved the participation of externally derived fluids.
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Більше джерел

Дисертації з теми "Isotopes du Sr"

1

Dennebouy, Stéphane. "Mise en évidence et caractérisation de la variabilité haute fréquence du rapport 87 Sr / 86 Sr du strontium océanique." Paris, ENMP, 2001. http://www.theses.fr/2001ENMP1102.

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2

Zattoni, Ana Paula. "Separation and analysis of Sr-90 and Zr-90 for nuclear forensic applications." Master's thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/26052.

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Анотація:
Le présent travail porte sur le développement technologique pour déterminer l'âge des sources de radiostrontium à travers du rapport [Zr-90]/[Sr-90], en utilisant les techniques de spectrométrie de masse et scintillation liquide pour quantifier les deux isotopes. Parce que Sr-90 et Zr-90 sont des interférences isobariques en spectrométrie de masse, une séparation radiochimique est nécessaire pour isoler du Zr-90 avant son analyse. Parmi quatre résines commerciales, la résine DGA a fourni la meilleure performance pour isoler le Zr-90 du Sr-90. Des récupérations supérieures à 99% pour le Zr-90 ont été obtenues. La résine DGA était aussi l'approche la plus rapide et la plus efficace pour éliminer les interférences isobariques du Sr-90 et aussi de l’Y-90 potentiellement présents dans des échantillons contenant des niveaux élevés de radioactivité. Des expériences impliquant l’utilisation d’une cellule de collision pour éliminer des interférences isobariques ont fourni des facteurs de décontamination insuffisants pour des applications en criminalistique nucléaire.
In this work, a technological development to determine the age of radioactive strontium sources through the [Zr-90]/[Sr-90] ratio using mass spectrometry and liquid scintillation to quantify both isotopes is presented. Because Sr-90 and Zr-90 are isobaric interferences in mass spectrometry, a radiochemical separation to isolate Zr-90 has been shown to be mandatory prior to analysis. Four commercial resins (AG50W-X9, Dowex1-X8, Sr and DGA resins) were tested to isolate Zr-90 from Sr-90. Best performance was observed for the DGA resin, including recoveries higher than 99% for Zr-90. DGA has also demonstrated to be the faster approach and the most efficient not only to eliminate isobaric interferences from Sr-90, but also from Y-90, potentially present in samples containing high levels of radioactivity. Experiments using a collision cell to eliminate isobaric interferences in a triple quadrupole mass spectrometer (ICP-QQQMS) have also been carried out, but results have demonstrated insufficient decontamination factors for nuclear forensic applications.
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3

Medini, Salim. "Traçage géographique des huiles d’olive par les isotopes du Sr : développement analytique et application aux huiles AOP de Nîmes." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4306/document.

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Depuis de nombreuses années, une approche a été mise en œuvre reposant sur l'identification de l'origine géographique d'un produit agro-alimentaire via la connaissance de ses isotopes du Sr, notamment via l'analyse du rapport 87Sr/86Sr. L'objectif de cette thèse est d'appliquer cette stratégie de reconnaissance aux huiles d'olive, en s'appuyant sur la production des huiles AOP de Nîmes dans le Sud de la France (Gard). La viscosité, la charge organique élevée, la teneur faible en Sr de cette matrice, rendent néanmoins inadaptés les protocoles de purification du Sr existants. La première approche de l'étude correspond donc à la définition et à la validation d'une méthode de traitement des huiles d'olive en vue de la purification du Sr afin de procéder à l'analyse de sa composition isotopique (CI). La seconde partie de l'étude est consacrée à la définition des processus d'assimilation et de transfert du Sr dans l'olivier. Cette approche, menée grâce à une étude détaillée d'un des moulins AOP de Nîmes, a permis de démontrer que le transfert du Sr des sols vers l'olivier et au sein des oliviers se fait sans fractionnement isotopique.La dernière partie de l'étude s'appuie sur la mesure et la caractérisation des rapports isotopiques 87Sr/86Sr des dix huiles d'olive AOP de Nîmes, et une comparaison de cette signature avec celle des formations géologiques sur lesquelles reposent les parcelles de culture. L'identité de la CI huile-territoire de culture a permis de conclure, dans le contexte de production de l'huile d'olive AOP de Nîmes, que les isotopes du Sr constituent un très bon outil de traçage de l'origine géographique des produits oléicoles
For many years, an approach based on the identification of the geographical origin for food product has been implemented through the knowledge of its Sr isotopes, particularly through the analysis of 87Sr / 86Sr ratio. The objective of this thesis is to develop a similar strategy for the olive oils, from the example of PDO Nimes (Gard), in southern France. A specific methodology is necessary since the existing purification protocols of Sr revealed themselves inadequate because of viscosity, high organic load, low Sr content of this matrix In order to proceed to the analysis of the isotopic composition (IC), the first part of the study highlights the definition and validation of a specific method for the treatment of olive oils and strontium purification. The second part of the study is dedicated to expose the processes of assimilation and transfer of strontium into the olive tree. This approach, conducted through a detailed study of one of Nîmes PDO mills, demonstrated that the transfer of strontium from soils to olive tree, and within the olive tree, occurs without isotope fractionation.The last part of the manuscript studies the isotopic ratios 87Sr / 86Sr of the ten PDO olive oils of Nimes and consists in a comparison of this signature with the geological formations underlying the cultivation soils. This approach allows discussing quality of Sr isotopic tool in the geographical recognition of the olive products. The observed similarity between th IC from oils and soil allow us to conclude that, in this context of production, the Sr isotopes are a efficient tool to trace and certify the geographical origin of the oil
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4

Potot, Cécile. "Étude hydrochimique du système aquifère de la basse vallée du Var : apport des éléments traces et des isotopes (Sr, Pb, O, Ra)." Nice, 2011. http://www.theses.fr/2011NICE4004.

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Анотація:
L’objectif principal de cette étude est d’améliorer les connaissances sur le système aquifère de la basse vallée du Var, principale ressource d’eau potable dans une région soumise à des influences méditerranéennes et alpines. La composition des éléments majeurs et traces, des isotopes de l’O, du Pb et du Sr a été déterminée à différentes périodes hydrologiques dans les eaux du fleuve Var, de ses affluents, de la nappe alluviale de la basse vallée, et des aquifères des calcaires jurassiques et des poudingues pliocènes, qui constituent le substratum des alluvions. Les concentrations mesurées sont souvent proches du fond géochimique naturel, ce qui fournit pour chaque type d’eaux un point de référence de la qualité et permet, grâce à la sensibilité de la mesure des traces, de détecter la moindre pollution émergente. Des pollutions agricoles et / ou domestiques ont été détectées, en particulier dans les eaux des poudingues, ceci même en profondeur. Le fleuve constitue la principale source d’alimentation de la nappe alluviale, essentiellement à l’amont de la vallée. La recharge de la nappe par l’aquifère des poudingues représente 20 % environ, ce qui est inférieur aux estimations précédentes. L’utilisation conjointe des éléments traces et majeurs met en évidence l’hétérogénéité des eaux des poudingues, et permet d’évaluer les proportions de mélange. L’alimentation de la nappe par les calcaires semble faible. La forte influence chimique des évaporites triasiques limite l’utilisation des isotopes du Sr comme marqueur d’origine des eaux. Les isotopes du Pb ont fourni des résultats complexes qui semblent montrer une origine à la fois naturelle et anthropique, cette dernière apparemment liée aux pluies. Les isotopes du Ra ont été utilisés afin d’estimer le temps de parcours dans la nappe alluviale. La faisabilité analytique de la méthode semble acquise. Malgré d’importants échanges avec le milieu traversé, l’utilisation des rapports isotopiques semble s’affranchir de certains processus complexes
The main goal of this study is to improve the knowledge of the Lower Var Valley aquifers, under both Mediterranean and Alpine influences. Majors, trace elements, and O, Sr and Pb isotopes have been analysed under various hydrological conditions in water of the Low Var Valley including the alluvial aquifer, the Var River, its tributaries and groundwaters from Jurassic limestones and Pliocene conglomerates, which are the substrate of alluvia. Concentrations of most majors and trace elements are often close to the natural background, which gives a baseline quality of waters. High sensitivity in trace element measurement may allow to early detect contamination in any water body. Agricultural and / or residential contaminations have been detected in limestone and above all in conglomerate groundwater. The Var River is the main source of water of the alluvial aquifer, especially in upstream part. Conglomerate groundwater inputs stand for about 20 % of alluvial water recharge, which is lower than previously estimated. The use of both major and trace elements gives evidences of high heterogeneity in conglomerate groundwater and leads to estimate the proportions of inputs to the alluvial aquifer. Recharge of the alluvial aquifer by Jurassic limestones seems to be significant. Strong influence of Triassic evaporates in most samples gives limitation to the use of strontium isotopes as tracers of water origin. Pb isotopes gave complex results, which could suggest both a natural origin and an anthropogenic one that could be related to rainwater. Radium isotopes were used to estimate the flow velocity in the alluvial aquifer. Several techniques demonstrate the analytical feasibility of this approach and despite important exchanges with aquifer matrix, the use of isotopic ratios apparently minimizes the effect of complex processes
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5

Porter, Courtney. "Solute Inputs to Soil and Stream Waters in a Seasonally Snow-Covered Mountain Catchment Determined Using Ge/Si, ⁸⁷SR/⁸⁶SR and Major Ion Chemistry: Valles Caldera, New Mexico." Thesis, The University of Arizona, 2012. http://hdl.handle.net/10150/265377.

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Weathering releases lithogenic elements to soil and stream waters that support life in catchment ecosystems. Seasonal and inter-annual variations in hydrologic conditions change subsurface flowpaths, modifying the influence of weathering on stream waters. This study, over two climatically variable years, determined seasonal and inter-annual changes in solute sources to streams using a multi-tracer approach including major cations, strontium isotopes, germanium (Ge)/silica ratios, carbon species, and trace metals. Stream water cations display constant concentrations although discharge response was highly variable, suggesting that there is a consistent subsurface water supply. However, Sr isotope ratios, and concentrations of Ge, Fe, Al, and dissolved organic carbon, which originate from shallow soil waters, increase with the hydrograph during a wet winter snowmelt. This indicates that during a year with a thick snowpack, stream waters contain components of both shallow soilwater and groundwater during snowmelt, whereas during all other times groundwater contributes predominantly to the stream.
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6

Partey, Frederick Kenneh. "SOURCE OF FLUORINE AND PETROGENESIS OF THE RIO GRANDE RIFT TYPE BARITE-FLUORITE-GALENA DEPOSITS." Miami University / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=miami1092262697.

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7

Bouchard, Laurianne. "Rb-Sr Age Estimates of Pore Fluids in Sedimentary Rocks, DGR Site, Kincardine, Ontario." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32271.

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This study is part of a project aiming for the long-term burying of nuclear wastes in Kincardine, Ontario. Bedrock formations as well as their associated waters were analyzed in drill cores from the Michigan sedimentary basin, southwest Ontario. This research utilizes geochemistry combined to strontium and rubidium isotope ratios in order to determine the origin of porewaters from Ordovician shales and limestones. It is demonstrated that these waters are the result of a mixing line between the Silurian (Guelph) and Cambrian groundwaters. This last end-member was also mixed with Precambrian brines to some extent. Strontium and rubidium isotopes also demonstrated rubidium in clays were leached by porewaters over time. Once in solution, radioactive rubidium decayed into strontium over time. This process explains the accumulation of radiogenic strontium observed in porewaters. An age estimate for the deposition of carbonates and other evaporates was calculated with the Rb-Sr isotope system. The calculated age is 453.7 million years before present for dolomites, which is consistent with the history of the site. It was possible to gen an approximate age of 339.7 million years for the formation of illites. This corresponds to the illitization process that occurred after the deposition of rocks, when the Silurian brines infiltrated the deeper Ordovician shale. It was also possible to estimate of porewaters ages.
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8

Brazier, Jean-Michel. "Rôle des phases minérales des sols en tant que réservoirs de nutriments : approche expérimentale (abiotique), en milieu naturel et multi-isotopique (isotopes stables Ca-Sr)." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAH005/document.

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Ce travail de thèse a appréhendé les mécanismes de stockage/libération, d’un point de vue élémentaire et isotopique, du calcium (Ca) et du strontium (Sr) sur ou dans des phases minérales communes des sols (minéraux primaires, minéraux argileux, oxy-hydroxydes, carbonate pédogénétiques). Une méthode de mesure robuste du δ88Sr a dû être développée et validée par la mesure de matériaux de références internationaux, pour la plupart jamais mesuré dans la littérature. Les résultats montrent que l’adsorption du Ca sur des minéraux phyllosilicatés génère un fractionnement isotopique par prélèvement préférentiel de l’isotope léger (40Ca) dans nos conditions expérimentales lorsque les minéraux possèdent une charge structurale et une surface spécifique importante et/ou un espace interfoliaire ouvert à l’adsorption de cations hydratés. Une étude sur des rhizolithes en milieu naturel a mis en avant que l’utilisation des isotopes du Ca et du Sr permet un traçage de source et de mécanismes efficaces dans les thématiques touchant au stockage de ces deux éléments dans les sols
This PhD thesis examined the mechanisms of storage and release, from and elementary and isotopically point of view, of calcium (Ca) and strontium (Sr) onto or into mineral phases commonly encountered within soils (primary minerals, clay minerals, oxy-hydroxides, pedogenic carbonate). A robust δ88Sr measurements method had to be developed in the laboratory and validated by the measurement of international reference materials, mostly never measured in the literature. The results of this work show that Ca adsorption onto phyllosilicate minerals generates a quantifiable isotopic fractionation by preferential uptake of the light isotope (40Ca) under our experimental conditions when the minerals have a significant structural charge and specific surface area and/or an interlayer space open to hydrated cations adsorption. A study on rhizoliths in natural environment has also highlighted that the combination of Ca and Sr isotopes allows an effective tracing of sources and mechanisms in the problematic related to the storage of these two elements within soils
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Bayon, Germain. "An investigation into ND and SR isotopes in marine sediments and their application to paleoceanography." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250079.

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10

Pullyottum, Kavil Sarath. "Isotopic tracing (Si, Ca, Sr, H and O) of biogeochemical processes in Indian groundwater along the land-to-ocean continuum." Electronic Thesis or Diss., Sorbonne université, 2023. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2023SORUS053.pdf.

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Les eaux souterraines forment un système dynamique avec une grande hétérogénéité spatiale et temporelle, et agissent en tant qu'intermédiaire entre les processus de surface dans la zone critique et les fleuves qui apportent les solutés vers l'océan. Des études récentes révèlent que la décharge sous-marine d'eaux souterraines (SGD) est une voie dominante pour l'apport de nutriments aux côtes, dépassant souvent les flux de nutriments fluviaux, formant ainsi une composante importante des cycles biogéochimiques marins. Cependant, les SGD restent négligées dans les bilans de nutriments et sont difficiles à quantifier. Parmi ceux-ci, le silicium (Si) est un nutriment essentiel pour les diatomées, l'un des principaux producteurs primaires des écosystèmes aquatiques. Les bassins versants tropicaux humides avec précipitations saisonnières de mousson, généralement trouvés en Inde, favorisent une altération intense des silicates, ce qui entraîne des flux élevés de Si vers les eaux. Cependant, l'agriculture peut moduler le cycle de Si ce qui nécessite une évaluation plus poussée, notamment dans les eaux souterraines. Cette thèse étudie trois aspects majeurs du cycle de Si dans les eaux souterraines : i) l'impact des modifications de l'utilisation des terres et des précipitations de mousson sur Si dissous (DSi) et la signature isotopique de Si (δ30Si) des eaux souterraines en comparant un bassin versant agricole (Berambadi) et un bassin versant forestier (Mule Hole) à deux saisons, ii) élucider les interactions entre eaux souterraines et eaux de surface dans le plus grand système estuarien de mousson en Inde (Godavari) et, iii) quantifier les flux de Si apportés par la contribution en eaux douces des SGD vers l'Océan Indien grâce à une série d’échantillons d'eaux souterraines côtières. Pour cela, nous utilisons des traceurs isotopiques : isotopes de l'eau et 87Sr/86Sr pour identifier les sources et les mélanges, δ30Si et rapports Ge/Si pour tracer le cycle du Si, et δ44/40Ca pour déterminer l'altération des carbonates. Ce travail a permis d'augmenter la moyenne des δ30Si des eaux souterraines mondiales de 0,49±0,9‰ (1SD, n=66) à 0,81±0,9‰ (1SD, n=224), inférieure aux δ30Si des eaux de rivière et de l’océan. Nous montrons que les signatures δ30Si des eaux souterraines ne sont pas impactées par les modifications de l'utilisation des terres ni la saisonnalité, et sont principalement contrôlées par l'altération des silicates et la formation d'argiles secondaires. Les eaux souterraines présentent généralement un comportement stable avec un équilibre dynamique entre l'apport de Si et la formation de phases secondaires. Les δ30Si issus de l'altération, de l'adsorption et de l'absorption par les plantes qui se produisent dans les horizons peu profonds du sol et du saprolite sont partiellement homogénéisés par l'altération du régolithe dans la zone profonde. Les δ30Si de l'estuaire de Godavari présentent une variabilité saisonnière importante, principalement due aux diatomées et parfois à un apport hétérogène issus des eaux souterraines pendant la saison sèche, alors que l'altération des silicates et la formation d'argiles secondaires dominent pendant la saison humide. L’estuaire est un filtre important pour l’apport en Si à l'océan, en retirant ~15% du DSi total apporté par le fleuve Godavari. Les δ44/40Ca dans l'estuaire (1,3±0,5‰, 1SD, n=16) et ses eaux souterraines (1,6±0,7‰, 1SD, n=15) sont très hétérogènes. Le fractionnement isotopique du Ca, tant dans l'estuaire que dans les eaux souterraines, est principalement dû à la précipitation des carbonates secondaires, un processus qui nécessiterait une étude plus approfondie. Enfin, DSi et δ30Si des eaux souterraines côtières indiennes indiquent que les apports d’eaux douces par SGD contribuent à <1% du flux total de Si apporté par les fleuves ce qui est considéré comme ayant un impact insignifiant sur les budgets océaniques de Si et d'isotopes dans l'Océan Indien Nord
Groundwater forms a dynamic system exhibiting spatial and temporal heterogeneity, and acts as an intermediate between surface processes occurring in critical zone and the riverine systems, which ultimately delivers solutes from continents to ocean. Recent studies reveal that the submarine groundwater discharge (SGD) is a dominant pathway for nutrient delivery to the coastal ocean, often exceeding riverine nutrient fluxes, thus forming a significant component of oceanic biogeochemical cycling. However, SGD remains overlooked in coastal nutrient budgets and is difficult to quantify given large spatial and temporal variability. Among the elements delivered to the coast through SGD, silicon (Si) forms a key nutrient for diatoms, one of the dominant primary producers in freshwaters, estuary and coastal ecosystems. Tropical humid watersheds with seasonal monsoonal precipitation, commonly found in Indian subcontinent, favors intense silicate weathering resulting in high Si fluxes to surface and groundwaters. However, anthropogenic activities including agriculture and damming can significantly modulate Si cycling and requires further evaluation, particularly in groundwater. The present research investigates three major aspects of groundwater Si cycling: i) the impact of land use alterations (such as agriculture) and monsoon precipitation in groundwater dissolved silicon (DSi) and silicon isotopic signature (δ30Si) by comparing an agricultural (Berambadi) and forested (Mule Hole) watersheds across two seasons, ii) elucidating groundwater-surface water interactions in the largest monsoonal estuarine system in India (Godavari) and, iii) quantify the fresh submarine groundwater derived Si fluxes to Indian Ocean using a series of coastal groundwaters along Indian coastline. We employ multiple isotopic tracers to understand biogeochemical processes in groundwater including water isotopes and 87Sr/86Sr to understand sources and mixing, δ30Si and Ge/Si ratios to trace Si cycling, and δ44/40Ca to decipher carbonate weathering in critical zone. The present work increased the δ30Si average of global groundwater from 0.49±0.9‰ (1SD, n=66) to 0.81±0.9‰ (1SD, n=224), lower than the river water and seawater δ30Si. We show that the δ30Si signatures of groundwater are not impacted by land use alterations and seasonal monsoon, and are primarily driven by silicate weathering and secondary clay formation in soil and saprolite. Groundwater system generally exhibits a steady state behavior with a dynamic equilibrium between Si supply and formation of secondary phases. We conclude that Si isotopic signatures of weathering, adsorption, and plant uptake occurring in the shallow soil and saprolite horizons are partly overprinted and homogenized by the regolith weathering in the deep critical zone. In the second part of the thesis, we study Godavari estuary and adjacent groundwater to discern sources vs. mixing vs. processes along this land-to-ocean interface. The δ30Si signatures of estuary exhibit significant temporal variability, primarily driven by diatom uptake and some heterogeneous groundwater discharge during dry season while silicate weathering and secondary clay formation in the basin dominate during wet season. We note that estuaries can act as significant filters for Si supply to ocean, removing ~15% of the total DSi supplied by the Godavari river. The δ44/40Ca composition in Godavari estuary (1.3±0.5‰, 1SD, n=16) and groundwaters (1.6±0.7‰, 1SD, n=15) are highly heterogenous. The Ca isotopic fractionation in both estuary and groundwater are primarily driven by precipitation of secondary carbonates, a process that would require further study. Finally, the dissolved silicon and δ30Si of coastal groundwater all over India indicates that fresh SGD discharge contributes to <1% of the total Si flux of the rivers and is considered to have insignificant impact on oceanic Si and isotopic budgets in North Indian Ocean
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Книги з теми "Isotopes du Sr"

1

Lyon, Kenneth E. Retention of ¹³⁷Cs and ⁹⁰Sr by mineral sorbents surrounding vitrified nuclear waste. Ottawa, Canada: National Hydrology Research Institute, Inland Waters Directorate, 1985.

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2

A, Neymark Leonid, United States. Dept. of Energy. Nevada Operations Office, and Geological Survey (U.S.), eds. Geochemical and PB, SR, and O isotopic study of the Tiva Canyon Tuff and Topopah Spring Tuff, Yucca Mountain, Nye County, Nevada. Denver, Colo: U.S. Dept. of the Interior, U.S. Geological Survey, 1995.

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A, Neymark Leonid, Geological Survey (U.S.), and United States. Dept. of Energy. Nevada Operations Office., eds. Geochemical and PB, SR, and O isotopic study of the Tiva Canyon Tuff and Topopah Spring Tuff, Yucca Mountain, Nye County, Nevada. Denver, Colo: U.S. Geological Survey, 1995.

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4

K, Futa, Geological Survey (U.S.), and Saudi Arabia. Deputy Ministry for Mineral Resources., eds. Rb-Sr isotopic studies of postorogenic granites from the eastern Arabian Shield, Kingdom of Saudi Arabia. [Reston, Va.?]: Dept. of the Interior, U.S. Geological Survey, 1987.

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Stuckless, John S. Rb-Sr isotopic studies of postorogenic granites from the eastern Arabian Shield, Kingdom of Saudi Arabia. [Reston, Va.?]: Dept. of the Interior, U.S. Geological Survey, 1987.

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Stuckless, John S. Rb-Sr isotopic studies of postorogenic granites from the eastern Arabian Shield, Kingdom of Saudi Arabia. [Reston, Va.?]: Dept. of the Interior, U.S. Geological Survey, 1987.

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7

Duffield, Wendell A. A model to help explain Sr-isotope disequilibrium between feldspar phenocrysts and melt in large-volume silicic magma systems. [Menlo Park, Calif.?]: U.S. Dept. of the Interior, U.S. Geological Survey, 1994.

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8

G, Walthall Frank, Philpotts John A, and Geological Survey (U.S.), eds. Abundances of Li, Rb, and Sr in W-2, BCR-1, and AC-E determined by isotope dilution mass spectroscopy. [Reston, VA]: U.S. Dept. of the Interior, Geological Survey, 1993.

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9

Valbracht, Peter Jan. The origin of the continental crust of the Baltic shield, as seen through Nd and Sr isotopic variations in 1.89-1.85 Ga old rocks from western Bergslagen, Sweden. Utrecht: Drukkeru Elinkwuk, 1991.

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10

Vroon, Pieter Zeger. Subduction of continental material in the Banda Arc, eastern Indonesia: Sr-Nd-Pb isotope and trace-element evidence from volcanics and sediments. [Utrecht: Faculteit Aardwetenschappen der Rijksuniversiteit Utrecht, 1992.

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Частини книг з теми "Isotopes du Sr"

1

Slovak, N. M., and A. Paytan. "Applications of Sr Isotopes in Archaeology." In Advances in Isotope Geochemistry, 743–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-10637-8_35.

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2

Salazar-García, Domingo C., Christina Warinner, Jelmer W. Eerkens, and Amanda G. Henry. "The Potential of Dental Calculus as a Novel Source of Biological Isotopic Data." In Exploring Human Behavior Through Isotope Analysis, 125–52. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-32268-6_6.

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AbstractStable isotope analysis has become an essential tool in investigations of ancient migration and paleodietary reconstruction. Because the biogeochemistry of bone collagen and apatite is well known, current methods rely almost exclusively on analyses of bones and teeth; however, dental calculus represents a potentially additional biological source of isotopic data from ancient skeletons. Dental calculus is a mineralized bacterial biofilm that forms on the surfaces of teeth. Sampling dental calculus does not damage the dentition and thus can be used in cases where it is not possible to perform destructive analyses of conventional mineralized tissues. Like bone and dentine, dental calculus contains both inorganic and organic components, allowing measurement of C, N, O, H, and Sr isotopes. Additionally, dental calculus forms as serial, non-remodeling laminar accretions on the tooth surface, opening up the possibility of analyzing discrete time points during the lifetime of an individual. However, as a microbial biofilm and not a human tissue, the biochemistry of dental calculus is complex, containing multiple calcium phosphate mineral phases, organic and inorganic food remains, hundreds of human and bacterial proteins, and diverse biomolecules from thousands of endogenous bacterial taxa. Isotopic investigation of dental calculus is still in its infancy, and many questions remain regarding its formation and processes of diagenesis. This chapter (1) reviews the unique advantages presented by dental calculus as a novel source of biological isotopic data, (2) critically evaluates published isotopic studies of dental calculus, and (3) explores the current challenges of dental calculus stable isotope analysis through a case study of an Ancient Puebloan Basketmaker II population from the American Southwest.
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3

Tripathy, Gyana Ranjan, Sunil Kumar Singh, and S. Krishnaswami. "Sr and Nd Isotopes as Tracers of Chemical and Physical Erosion." In Advances in Isotope Geochemistry, 521–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-10637-8_26.

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Limouris, G. S., A. Manetou, S. Nikoletopoulos, N. Toubanakis, A. Stavraka, and L. Vlahos. "Pharmacokinetics and Dosimetry after Combined Application of Sr-89 Chloride and Re-186-HEDP in Bone Metastases." In Radioactive Isotopes in Clinical Medicine and Research, 371–73. Basel: Birkhäuser Basel, 1997. http://dx.doi.org/10.1007/978-3-0348-7772-5_56.

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Manetou, Ageliki, and Georgios S. Limouris. "Individualized Dose Estimation for Sr-89 with the Use of Diagnostic Tc-99m MDP Bone Scintigraphy." In Radioactive Isotopes in Clinical Medicine and Research XXIII, 71–77. Basel: Birkhäuser Basel, 1999. http://dx.doi.org/10.1007/978-3-0348-8782-3_10.

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6

Okano, Osamu, and Mitsunobu Tatsumoto. "Petrogenesis of Ultramafic Xenoliths from Hawaii Inferred From Sr, Nd, and Pb Isotopes." In Earth Processes: Reading the Isotopic Code, 135–47. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm095p0135.

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7

Sikler, G., G. Audi, D. Beck, G. Bollen, O. Engels, F. Herfurth, A. Kellerbauer, et al. "Mass measurements on unstable Sn and Sr isotopes with the ISOLTRAP mass spectrometer." In Exotic Nuclei and Atomic Masses, 48. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55560-2_15.

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8

Grousset, F. E., and P. E. Biscaye. "Nd and Sr Isotopes as Tracers of Wind Transport: Atlantic Aerosols and Surface Sediments." In Paleoclimatology and Paleometeorology: Modern and Past Patterns of Global Atmospheric Transport, 385–400. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0995-3_16.

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9

Yokoo, Yoriko, and Takanori Nakano. "Sequential Leaching of Volcanic Soil to Determine Plant-Available Cations and the Provenance of Soil Minerals Using Sr Isotopes." In Acid rain 2000, 1583–88. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-007-0810-5_111.

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10

Bollen, G., H. J. Kluge, H. Hartmann, T. Otto, G. Savard, L. Schweikhard, H. Stolzenberg, G. Audi, R. B. Moore, and G. Rouleau. "High-Accuracy Mass Determination of Unstable Rb, Sr, Cs, Ba, Fr and Ra Isotopes with a Penning Trap Mass Spectrometer." In Nuclear Shapes and Nuclear Structure at Low Excitation Energies, 399–405. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3342-9_36.

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Тези доповідей конференцій з теми "Isotopes du Sr"

1

Sarvian, Niloufar, Andrew D. Jacobson, Magdalena R. Osburn, Adam C. Maloof, and Matthew T. Hurtgen. "STABLE SR ISOTOPES AND THE NEOPROTEROZOIC CARBONATE CYCLE." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-351459.

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Kirichenko, Yana, Netta Shalev, Jörg Rickli, and Tomaso Bontognali. "Understanding the role of gypsum in the global Sr cycle using stable-Sr isotopes." In Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.19323.

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3

SARRIGUREN, P., E. MOYA DE GUERRA, and A. ESCUDEROS. "GAMOW-TELLER STRENGTH DISTRIBUTIONS IN PROTON-RICH SR ISOTOPES." In Proceedings of the Eleventh International Symposium. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812795151_0123.

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4

Bednarick, Amanda, Claire Bucholz, Daniel Stolper, and Donald DePaolo. "Temporal evolution of Sr isotopes in island arc rocks." In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.12549.

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5

Lu, Feng Hu. "Using Isotope Technology to Identify Oil and Gas Reservoir Sweet Spots." In SPE Reservoir Characterisation and Simulation Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/212642-ms.

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Abstract Porosity and permeability of rocks are crucial parameters utilized to assess the quality of oil and gas reservoirs. Diagenesis in carbonate reservoirs commonly results in dissolution, and creates secondary porosity and permeability. At the same time, geochemical records (e.g., isotopes and elements) in the carbonate rocks are diagenetically altered. This study is to utilize the isotope technology to evaluate diagenesis and its impact on oil and gas reservoirs. Micro-samples were collected from marine carbonate rocks in a studied reservoir for carbon and oxygen isotope analyses, plus analyses of Sr isotopes and element concentrations. The analytical results show outstanding negative shifts of oxygen isotopes in some intervals, whereas carbon and strontium isotopes have a minor or little change. These intervals also contain lower element contents including strontium. It is believed that these intervals experienced diagenetic dissolution with abundant secondary porosity, and are the best potential for oil and gas reservoirs. Petrographic study indicates minor cements but higher porosity developed within these intervals. This is confirmed by high porosity measured within these intervals by using other methods including gas injection and well logging. Furthermore, the degrees of water-rock interaction were quantitively assessed by modeling covariations of isotope pairs, which can help evaluate the quality of reservoirs relating to the intensity of diagenesis. Intensive diagenesis with a high water-rock ratio particularly in a closed system may result in additional cementation, alteration of most geochemical parameters, and also reduce porosity and permeability. Thus, the isotope technology can be utilized as an effective method to assess reservoir potential and determine reservoir sweet spots. Note that carbonate cementation and recrystallization commonly occur during diagenesis, and commonly show negative oxygen isotope values. If sampling happens to contain a certain amount of cements and recrystallized carbonate minerals, the analytical results will show lower oxygen isotopes and trace elements than their primary values in the studied marine carbonates. Petrographic study was conducted to help micro-sampling, and verify that cements were not collected in the studied carbonate rocks for isotope analysis. The implementation of this study is that the isotope results obtained from one studied well can be applied in the whole field or/and the region, as diagenesis rarely occurs only around one well. This will save cost for repeatedly measurements from different wells and fields by using other methods.
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6

Wang, Jiuyuan, Andrew Jacobson, Bradley Sageman, and Matthew Hurtgen. "Stable Ca and Sr Isotopes Indicate Biocalcification Crisis during OAE1a." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2734.

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7

Kani, Tomomi, Yukio Isozaki, Keiji Misawa, Akira Ishikawa, and Shigekazu Yoneda. "Stable Sr Isotopes of the Middle-Late Permian Carbonate: Its Implication for Driving Ocean Sr Budget Change." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.1247.

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8

Krebs, Mandy Y., D. Graham Pearson, Andrew J. Fagan, and Chiranjeeb Sarkar. "GEOGRAPHIC ORIGIN DETERMINATION OF RUBY AND SAPPHIRE USING SR - PB ISOTOPES." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-321398.

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9

Heenen, P. H., P. Bonche, and J. Dobaczewski. "Triaxial nuclear dynamics of Sr isotopes studied by the generator coordinate method." In Future Directions in Nuclear Physics with 4π Gamma Detection Systems of the New Generation. AIP, 1992. http://dx.doi.org/10.1063/1.42573.

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10

Rodríguez-Guzmán, R., P. Sarriguren, L. M. Robledo, Paraskevi Demetriou, Rauno Julin, and Sotirios Harissopulos. "Signatures of structural changes in neutron-rich Sr, Zr and Mo isotopes." In FRONTIERS IN NUCLEAR STRUCTURE, ASTROPHYSICS, AND REACTIONS: FINUSTAR 3. AIP, 2011. http://dx.doi.org/10.1063/1.3628395.

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Звіти організацій з теми "Isotopes du Sr"

1

Kidder, J. A., M. B. McClenaghan, M I Leybourne, M. W. McCurdy, P. Pelchat, D. Layton-Matthews, C. E. Beckett-Brown, and A. Voinot. Geochemical data for stream and groundwaters around the Casino Cu-Au-Mo porphyry deposit, Yukon (NTS 115 J/10 and 115 J/15). Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/328862.

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This open file reports geochemical data for stream and groundwater samples collected around the Casino porphyry Cu-Au-Mo deposit, one of the largest and highest-grade deposits of its kind in Canada. The calc-alkaline porphyry is hosted in a Late Cretaceous quartz monzonite and associated breccias in the unglaciated region of west central Yukon. Water chemistry around the deposit was investigated because: (i) the deposit has not yet been disturbed by mining; (ii) the deposit was known to have metal-rich waters in local streams; and (iii) the deposit has atypically preserved ore zones. Stream water samples were collected at 22 sites and groundwater samples were collected from eight sites. Surface and groundwaters around the Casino deposit are anomalous with respect to Cd (up to 5.4 µg/L), Co (up to 64 µg/L), Cu (up to 1657 µg/L), Mo (up to 25 µg/L), As (up to 17 µg/L), Re (up to 0.7 µg/L), and Zn (up to 354 µg/L) concentrations. The stable isotopes of O and H of the groundwaters are essentially identical to the surface waters and plot close to the local and global meteoric water lines, indicating that the waters represent modern recharge, consistent with the generally low salinities of all the waters (total dissolved solids range from 98 to 1320 mg/L). Sulfur and Sr isotopes are consistent with proximal waters interacting with the Casino rocks and mineralization; a sulfide-rich bedrock sample from the deposit has delta-34S = -1.2 permille and proximal groundwaters are only slightly heavier (-0.3 to 3.1 permille). These geochemical and isotopic results indicate that surface water geochemistry is a suitable medium for mineral exploration for porphyry-style mineralization in the Yukon, and similar unglaciated regions in Canada. The atypical geochemical signature (Mo, Se, Re, As, Cu) of these types of deposits are typically reflected in the water chemistry and S isotopes provide a more local vectoring tool.
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2

Scanlan, E. J., M. Leybourne, D. Layton-Matthews, A. Voinot, and N. van Wagoner. Alkaline magmatism in the Selwyn Basin, Yukon: relationship to SEDEX mineralization. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328994.

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Several sedimentary exhalative (SEDEX) deposits have alkaline magmatism that is temporally and spatially associated to mineralization. This report outlines interim data from a study of potential linkages between magmatism and SEDEX mineralization in the Selwyn Basin, Yukon. This region is an ideal study site due to the close spatial and temporal relationships between SEDEX deposits and magmatism, particularly in the MacMillan Pass, where volcanic rocks have been drilled with mineralization at the Boundary deposit. Alkaline volcanic samples were analysed from the Anvil District, MacMillan Pass, Keno-Mayo and the Misty Creek Embayment in the Selwyn Basin to characterise volcanism and examine the relationship to mineralization. Textural and field relationships indicate a volatile-rich explosive eruptive volcanic system in the MacMillan Pass region in comparison to the Anvil District, which is typically effusive in nature. High proportions of calcite and ankerite in comparison to other minerals are present in the MacMillan system. Cathodoluminescence imaging reveals zoning and carbonate that displays different luminescent colours within the same sample, likely indicating multiple generations of carbonate precipitation. Barium contents are enriched in volcanic rocks throughout the Selwyn Basin, which is predominately hosted by hyalophane with rare barite and barytocalcite. Thallium is positively correlated with Ba, Rb, Cs, Mo, As, Sb and the calcite-chlorite-pyrite index and is negatively correlated with Cu. Anvil District samples display a trend towards depleted mid-ocean ridge mantle on a plot of Ce/Tl versus Th/Rb. Hydrothermal alteration has likely led to the removal of Tl from volcanic rocks in the region. Ongoing research involves: i) the analysis of Sr, Nd, Pb and Tl isotopes of volcanic samples; ii) differentiating magmatic from hydrothermal carbonate using O, C and Sr isotopes; iii) examining sources of Ba in the Selwyn Basin; iv) and constraining age relationships through U-Th-Pb geochronology.
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3

Macêdo Filho, Antomat Avelino, and Maria Helena Hollanda. The Effect of Alteration on Sr-Nd Isotopes of Mafic Rocks: Examples From Rio Ceará-Mirim Dyke Swarm, NE Brazil. Peeref, September 2022. http://dx.doi.org/10.54985/peeref.2209p1380949.

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4

Carle, Steven F. Updated Kd Estimates for Modeling Sorption of Cs, Sr, and Pu Isotopes in Hydrostratigraphic Units of Rainier Mesa and Shoshone Mountain. Office of Scientific and Technical Information (OSTI), May 2018. http://dx.doi.org/10.2172/1459145.

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5

Inglis, Jeremy. Utility of Sr and Nd isotope signatures in U ores and UOCs. Office of Scientific and Technical Information (OSTI), February 2022. http://dx.doi.org/10.2172/1846891.

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6

Ehst, D. A. Technology development for Sr-89 production with 100kW medical isotope production system (MIPS-100). Final CRADA Report. Office of Scientific and Technical Information (OSTI), October 2009. http://dx.doi.org/10.2172/967951.

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7

Richardson, J. M., K. Bell, J. Blenkinsop, and D. H. Watkinson. Fluid-saturation textures and Rb-Sr isotopic data from the East Kemptville tin deposit, southwestern Nova Scotia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/122433.

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8

Theriault, R. J. Methods for Rb-Sr and Sm-Nd isotopic analyses at the geochronology laboratory, Geological Survey of Canada. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/129062.

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9

Newberry, R. J., and S. A. Haug. CIPW Norm, trace element, and Sr isotopic data for igneous rocks of the Tanana B-1 Quadrangle and vicinity. Alaska Division of Geological & Geophysical Surveys, 1997. http://dx.doi.org/10.14509/1780.

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10

Smit, H., R. L. Armstrong, and P. Van Der Heyden. Petrology, chemistry and radiogenic isotope [K-Ar, Rb-Sr, and U-Pb] study of the Emerald Lake pluton, eastern Yukon Territory. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120261.

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