2,386 research outputs found

    Pb, Sr and Nd Isotope Ratios of Permian-Triassic Flood Basalts in the Basement of the West Siberian Plate

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    Permian-Triassic flood basalts are widespread across an extremely large area of the Siberian plate in the pre-Jurassic basement of the West Siberian plate. We show that Permian-Triassic flood basalts are similar to the trap basalts of the Siberian Platform with regard to geochemical features and Pb, Sr and Nd isotopic composition. Strontium and neodymium isotope ratios indicate the contribution to the formation of the flood basalts of the EM1 reservoir. We will also show a possible contamination of basalt magma by the Palaeozoic island-arc and orogenic rock complexes

    AGE OF THE KINTEREP FORMATION OF THE NORTHWESTERN SALAIR: CHEMOSTRATIGRAPHY AND U-Pb ZIRCON DATING

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    A comprehensive study of the stratotype section of the Kinterep formation of the North-Western Salair was carried out, including geochemical and isotope (Sr, C, O) studies of carbonate rocks, and U-Pb dating (LA-ICP-MS) of igneous zircon crystals from tuffites. The studied carbonate rocks are pure limestones with Mg/Ca less than 0.007 and a low proportion of insoluble residue (average 5 %). Kinterep limestones are characterized by δ18OSMOW values from 19.8 to 23.8 ‰ and δ13СPDB values from –0.7 to +0.9. The Sr isotope composition in limestones of the Kinterep formation varies in a narrow range of 87Sr/86Sr values between 0.70851 and 0.70859. Comparison of the obtained isotopic characteristics (87Sr/86Sr and δ13СPDB) of Kinterep formation limestones with the generalized global 87Sr/86Sr variation curve and δ13СPDB values in the pale-ocean suggests two equally probable interpretations of the time of accumulation of Kinterep formation limestones: 550–540 and 525–510 Ma. U-Pb dating of magmatic zircon crystals from tuffite, which forms an interlayer among limestones of the Kinterep formation, showed the age at the boundary of ~515 Ma. Thus, using a combination of isotope (Sr, C) chemostratigraphy of carbonate rocks and U-Pb dating of igneous zircon crystals from tuffites syngenetic to limestones, the age limit of 525–510 Ma was established for the time of the formation of the Kinterep formation of the Salair basin. Carbonate rocks of similar age and similar features of the isotopic composition are known in neighbouring areas (for example, the Kuznetsk Alatau) and in regions of the Siberian Platform and microcontinents of Central Asia (Tuva-Mongolian and Dzabkhan) spatially distant from the Salair basin

    THE METHOD FOR Cu AND Zn ISOTOPE RATIO DETERMINATION BY MC ICP-MS USING THE AG MP-1 RESIN

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    The isotopic composition of copper is of great interest for researchers in various fields of science, geochemistry and hydrology in particular, wherein the consideration is being given to the variations in the isotopic composition of the Earth’s crust, extraterrestrial matter, and water basins, as well as to the origin and transfer of matter. Zn isotopes appear to be promising for identifying the sources and pathways of the environmental pollution. The aim of this study involves the refinement and validation of the zinc and copper isotopic ratio determination methodology covering the whole process from sample digestion to MC ICP-MS measurements. For this reason, as well as to assess the suitability of the methodology for the analysis of environmental samples, Zn and Cu isotopic analysis of the BHVO-2, BCR-2 and AGV-2 USGS certified reference materials has been performed. The method for determination of Cu and Zn stable isotope ratios by multi-collector inductively coupled plasma mass spectrometry in environmental samples is developed. The application of the AG MP-1 resin with optimized layer parameters (resin bed height 3.5 cm, diameter 1 cm) provides the high-purity Cu and Zn fractions. The method is characterized by high throughput and adequate analytical figures of merit when using the standard-sample bracketing technique for mass bias correction. The procedural blanks related to chemical dissolution and ion exchange procedures are lower than 1 and 3 ng for Cu and Zn, respectively, assuring no blank effect on the isotopic composition of samples. The accuracy and precision obtained for Cu and Zn isotope measurements in the BHVO-2, BCR-2 and AGV-2 geological certified reference materials demonstrate good agreement with the reference values published

    МЕТОДИКА ОПРЕДЕЛЕНИЯ ИЗОТОПНЫХ ОТНОШЕНИЙ Cu И Zn МЕТОДОМ МК ИСП-МС С ИСПОЛЬЗОВАНИЕМ СМОЛЫ AG MP-1

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    The isotopic composition of copper is of great interest for researchers in various fields of science, geochemistry and hydrology in particular, wherein the consideration is being given to the variations in the isotopic composition of the Earth's crust, extraterrestrial matter, and water basins, as well as to the origin and transfer of matter. Zn isotopes appear to be promising for identifying the sources and pathways of the environmental pollution. The aim of this study involves the refinement and validation of the zinc and copper isotopic ratio determination methodology covering the whole process from sample digestion to MC ICP-MS measurements. For this reason, as well as to assess the suitability of the methodology for the analysis of environmental samples, Zn and Cu isotopic analysis of the BHVO-2, BCR-2 and AGV2 USGS certified reference materials has been performed. The method for determination of Cu and Zn stable isotope ratios by multi-collector inductively coupled plasma mass spectrometry in environmental samples is developed. The application of the AG MP1 resin with optimized layer parameters (resin bed height 3.5 cm, diameter 1 cm) provides the highpurity Cu and Zn fractions. The method is characterized by high throughput and adequate analytical figures of merit when using the standardsample bracketing technique for mass bias correction. The procedural blanks related to chemical dissolution and ion exchange procedures are lower than 1 and 3 ng for Cu and Zn, respectively, assuring no blank effect on the isotopic composition of samples. The accuracy and precision obtained for Cu and Zn isotope measurements in the BHVO2, BCR2 and AGV2 geological certified reference materials demonstrate good agreement with the reference values published. © 2022 Institute of the Earth's Crust. All rights reserved.ААААА181180530900458; Ministry of Education and Science of the Russian Federation, Minobrnauka: 075-15-2021-680; Russian Science Foundation, RSF: 18-77-10024The work of Okuneva T.G. is supported by the Russian Science Foundation (project 18-77-10024), the rest authors are supported by the state assignment of the IGG UB RAS ААААА181180530900458. Isotopic analyses are performed at the "Geoanalitik" Shared Research Facilities of the IGG UB RAS. The reequipment and comprehensive development of the "Geoanalitik" Shared Research Facilities of the IGG UB RAS is financially supported by the grant of the Ministry of Science and Higher Education of the Russian Federation (Agreement 075-15-2021-680).authors are supported by the state assignment of the IGG UB RAS ААААА 猃?猃猃稃爃眃甃爃笃爃爃瘃?稁 Isotopic analyses are performed at the 㘀Geoanalitik ? Shared Research Facilities of the IGG UB RAS. The reequipment and comprehensive development of the 㘀Geoanalitik 㘀 Shared Research Facilities of the IGG UB RAS is 퀀inancially supported by the grant of the Ministry of Science and Higher Education of the Russian Federation (Agreement 075-15-2021-680).FUNDING: The work of Okuneva T.G. is supported by the Russian Science Foundation (project 18-77-10024), the res

    Three point SUSY Ward identities without Ghosts

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    We utilise a non-local gauge transform which renders the entire action of SUSY QED invariant and respects the SUSY algebra modulo the gauge-fixing condition, to derive two- and three-point ghost-free SUSY Ward identities in SUSY QED. We use the cluster decomposition principle to find the Green's function Ward identities and then takes linear combinations of the latter to derive identities for the proper functions.Comment: 20 pages, no figures, typos correcte

    DETERMINATION OF GOLD IN ORES AND ROCKS BY ETAAS AFTER ITS EXTRACTION BY BRILLIANT GREEN

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    The aim of this work is to study the possibility of gold microconcentration in organic phase for its subsequent determination by ETAAS. The calibration curves obtained in this work indicate the possibilities of using proposed method for the extraction and concentration of gold from ores and rocks.Работа выполнена в ЦКП «Геоаналитик» в рамках темы № АААА-А18-118053090045-8 государственного задания ИГГ УрО РАН

    ВОЗРАСТ КИНТЕРЕПСКОЙ СВИТЫ СЕВЕРО-ЗАПАДНОГО САЛАИРА: ДАННЫЕ ХЕМОСТРАТИГРАФИИ И U-Pb ДАТИРОВАНИЯ ЦИРКОНА

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    A comprehensive study of the stratotype section of the Kinterep formation of the North-Western Salair was carried out, including geochemical and isotope (Sr, C, O) studies of carbonate rocks, and U-Pb dating (LA-ICP-MS) of igneous zircon crystals from tuffites. The studied carbonate rocks are pure limestones with Mg/Ca less than 0.007 and a low proportion of insoluble residue (average 5 %). Kinterep limestones are characterized by δ18OSMOW values from 19.8 to 23.8 ‰ and δ13СPDB values from –0.7 to +0.9. The Sr isotope composition in limestones of the Kinterep formation varies in a narrow range of 87Sr/86Sr values between 0.70851 and 0.70859. Comparison of the obtained isotopic characteristics (87Sr/86Sr and δ13СPDB) of Kinterep formation limestones with the generalized global 87Sr/86Sr variation curve and δ13СPDB values in the pale-ocean suggests two equally probable interpretations of the time of accumulation of Kinterep formation limestones: 550–540 and 525–510 Ma. U-Pb dating of magmatic zircon crystals from tuffite, which forms an interlayer among limestones of the Kinterep formation, showed the age at the boundary of ~515 Ma. Thus, using a combination of isotope (Sr, C) chemostratigraphy of carbonate rocks and U-Pb dating of igneous zircon crystals from tuffites syngenetic to limestones, the age limit of 525–510 Ma was established for the time of the formation of the Kinterep formation of the Salair basin. Carbonate rocks of similar age and similar features of the isotopic composition are known in neighbouring areas (for example, the Kuznetsk Alatau) and in regions of the Siberian Platform and microcontinents of Central Asia (Tuva-Mongolian and Dzabkhan) spatially distant from the Salair basin. Проведено комплексное изучение стратотипического разреза кинтерепской свиты Северо-Западного Салаира, включающее геохимические, изотопно-геохимические (Sr, С, О) исследования карбонатных пород и U-Pb датирование (LA-ICP-MS) магматогенных кристаллов циркона из туффитов. Изученные карбонатные породы представлены чистыми известняками с величиной Mg/Са менее 0.007 и низкой долей нерастворимого остатка (в среднем 5 %). Кинтерепские известняки характеризуются значениями δ18OSMOW от 19.8 до 23.8 ‰ и δ13СPDB от –0.7 до +0.9. Изотопный состав Sr в известняках кинтерепской свиты варьируется в узком диапазоне значений 87Sr/86Sr между 0.70851 и 0.70859. Сопоставление полученных изотопных характеристик (87Sr/86Sr и δ13СPDB) известняков кинтерепской свиты с обобщенной мировой кривой вариации 87Sr/86Sr и значений δ13СPDB в палеоокеане предполагает два равновероятных варианта интерпретации времени накопления известняков кинтерепской свиты: 550–540 и 525–510 млн лет. U-Pb датирование кристаллов магматогенного циркона из туффита, слагающего прослой среди известняков кинтерепской свиты, показало возраст формирования на рубеже ~515 млн лет. Таким образом, с помощью комбинации методов изотопной (Sr, С) хемостратиграфии карбонатных пород и U-Pb датирования кристаллов магматогенного циркона из сингенетичных известнякам туффитов установлены ограничения на время формирования кинтерепской свиты Салаирского бассейна 525–510 млн лет. Карбонатные породы, имеющие схожий возраст и аналогичные особенности изотопного состава, известны в соседних районах (например, Кузнецкий Алатау) и в пространственно отдаленных от Салаирского бассейна регионах Сибирской платформы и микроконтинентов Центральной Азии (Тувино-Монгольского и Дзабханского)

    87Sr/86Sr ISOTOPE RATIOS IN THE RIVER WATERS OF THE SOUTHERN URALS

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    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 for further absorption by plants and animals) strontium in the catchment specific area. Based on those 87Sr/86Sr ratios, the regional maps of the bioavailable strontium distribution (strontium isoscapes) can be compiled. A complex block structure characterizes the Ural mountain system. Individual parts (blocks) are composed of rocks of various ages, genesis and geochemical characteristics, which can radically change at a distance of several tens of kilometres. Such variability would be reflected in strontium isotopic ratios, thus making it possible to determine the local isotopic signatures of bioavailable strontium. This work aimed to study 87Sr/86Sr in the water in the rivers of the Southern Urals. We determined the contents and isotopic ratios of strontium in river water samples collected from the territories of the Orenburg and Chelyabinsk regions and 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, and others), the 87Sr/86Sr isotopic ratios have been determined, and their variations have been analyzed. 87Sr/86Sr values vary in 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 isotopic composition may be due to the influence of underlying rocks of the catchment area drained by river water. The data obtained can be used to identify the sources of strontium input into the water system during hydrological and environmental studies; to confirm the authenticity of food products of plant and animal origin; to carry out comparisons in the studies of the migration of ancient people and animals, as well as to determine the raw material areas for the production of vegetable and woollen textiles and wooden products in antiquity. © 2022 Institute of the Earth's Crust. All rights reserved.Russian Foundation for Basic Research, РФФИ: 20-09-00194; Ministry of Education and Science of the Russian Federation, Minobrnauka: 075-15-2021-680The study is supported by the Russian Foundation for Basic Research (project 20-09-00194) and performed within the state task of the IGG UB RAS АААА-А18-118053090045-8 at the "Geoanalitik" shared research facilities of the IGG UB RAS. The re-equipment and comprehensive development of the "Geoanalitik" shared research facilities of the IGG UB RAS is financially supported by the grant of the Ministry of Science and Higher Education of the Russian Federation (Agreement 075-15-2021-680).FUNDING: The study is supported by the Russian Foundation for Basic Research (project 20-09-00194) and performedwithin the state task of the IGG UB RAS АААА-А 猃稁猃猃稃爃眃甃爃? 爃爃瘃省稀 at the 㘀Geoana?itik 㘀 shared research faci?ities of the IGG UB RAS. The re-equipment and comprehensive deve?opment of the 㘀Geoana?itik 㘀 shared research faci?ities of the IGG UB RAS is 퀀inancia??y supported by the grant of the Ministry of Science and Higher Education of the Russian Federation (Agreement 075-15-2021-680)

    OPTIMIZATION OF THE TEMPERATURE-TIME PROGRAM FOR ELECTROTHERMAL MOLECULAR ABSORPTION DETERMINATION OF IODINE

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    Various experimental factors influencing the shape of the pyrolysis curve for the BaI molecule were studied in this paper. Dividing the pyrolysis stage into two stages and increas-ing the cleaning time made it possible to optimize the pyrolysis curve

    СЛУЧАЙ СЕРОЗНОГО МЕНИНГИТА РОТАВИРУСНОЙ ЭТИОЛОГИИ У ЧЕТЫРЕХЛЕТНЕГО РЕБЕНКА

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    Rotavirus infection is manifested, in some cases, not only by damage to the gastrointestinal tract, but also by the involvement of other organs and systems in the pathological process. A clinical case of rotavirus meningitis in a four-year-old girl was confirmed, which was confirmed by the detection of RNA virus by PCR in сerebrospinal fluid, while the virus was detected in the faeces by ELISA.Ротавирусная инфекция проявляется, в ряде случаев, не только поражением желудочно-кишечного тракта, но и вовлечением в патологический процесс других органов и систем. Представлен клинический случай ротавирусного менингита у девочки четырех лет, подтвержденный выявлением РНК вируса в ликворе методом ПЦР, при одновременном обнаружении вируса в кале методом ИФА
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