Temat: izotop węgla - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Sedimentary development and isotope analysis of deposits at the Cretaceous/Palaeogene transition in the Paraíba Basin, NE Brazil
Autorzy:: Neumann, Virgínio Henrique
Barbosa, José Antônio
Nascimento-Silva, Valberlândia Maria
Sial, Alcides Nobrega
Filho, Mario
Powiązania:: https://bibliotekanauki.pl/articles/94597.pdf
Data publikacji:: 2009
Wydawca:: Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:: NE Brazil
Cretaceous-Paleogene boundary
carbon isotopes
oxygen isotopes
Brazylia
izotop węgla
izotop tlenu
Opis:: New data are presented for three formations (Itamaracá, Gramame and Maria Farinha) and two boundaries (Campanian/Maastrichtian and Maastrichtian/Danian) in the Olinda Sub-basin of the Paraíba Basin. Currently accepted facies models, sequence stratigraphy characterizations, and stable-isotope data of carbon and oxygen are reviewed. The carbonate cement of the Itamaracá Formation sandstones shows carbon- and oxygen-isotope ratios consistent with a shallow-marine depositional environment: δ18O ranges from -0.8 to -2.7‰ PDB, and δ13C ranges from +1 to +2‰ PDB. Within the Itamaracá Formation, a maximum flooding surface at the Campanian/Maastrichtian transition has been identified. During the Maastrichtian, a Highstand System Tract was deposited, which shows an increase in temperature and marine bioproductivity as recorded by stable-isotope values (δ18O from -3 to -5‰ PDB, and δ13C values of -1.2, -0.3, 0.1 and +2.3‰ PDB). Just below the K/Pg boundary, the O-isotope signal indicates three warming phases, alternating with four cooling phases.
Źródło:: Geologos; 2009, 15, 2; 103-113
1426-8981
2080-6574
Pojawia się w:: Geologos
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Metodyka analiz izotopowych rozpuszczonego węgla nieorganicznego (DIC) i ich zastosowania w badaniach hydrogeologicznych i środowiskowych
Methodology and application of stable isotope analysis of dissolved inorganic carbon (DIC) in hydrogeology and environmental studies
Autorzy:: Szynkiewicz, A.
Drzewicki, W.
Jędrysek, M. O.
Powiązania:: https://bibliotekanauki.pl/articles/2074490.pdf
Data publikacji:: 2006
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: rozpuszczony węgiel nieorganiczny (DIC)
izotop węgla
dissolved inorganic carbon
carbon isotopes
Opis:: The analysis of carbon isotope composition of dissolved inorganic carbon (DIC) is widely applied in hydrogeology and environmental studies. The method of analysis is simple and based on conversion of all DIC species to gaseus CO2 under acidic conditions. However, the analytical procedure may involve significant carbon isotope fractionation. Our experimental analysis showed that increasing the time of CO2 extraction influences the increase of ä13C(DIC) value as a result of re-dissolution of CO2 in the water expanded on the vacuum line or/and carbon isotope exchange between the extracted CO2 and the atmospheric CO2. The long time of sample storage yields an increase of ä13C(DIC) value and decrease of DIC concentration. The analytical precision up to š 0,1‰ may be achieved in the case of waters being analyzed few days after sampling. DIC concentration was evaluated according to height of peak 44 in the mass spectrum. The analytical precision of this method was š 2 mgCO2 per dm3. This method is very useful because the measurements of the height of peak 44 and carbon isotope composition of DIC can be performed simultaneously. However, this method is reliable for waters containing more than 4 mg CO2 per dm3
Źródło:: Przegląd Geologiczny; 2006, 54, 9; 797-806
0033-2151
Pojawia się w:: Przegląd Geologiczny
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Geochemical and isotopic analyses of PM10 in Lower Silesia - preeliminary data
Autorzy:: Zwolińska, E.
Ciężka, M.
Powiązania:: https://bibliotekanauki.pl/articles/100782.pdf
Data publikacji:: 2013
Wydawca:: Uniwersytet Śląski. Wydział Nauk o Ziemi
Tematy:: PM10
pył
analiza
izotop węgla
Dolny Śląsk
zanieczyszczenia atmosferyczne
PM10 dust
carbon isotopic analyses
Lower Silesia
atmospheric pollutants
Opis:: The main aim of the study was to determine the origin of particulate air pollution in Lower Silesia. Samples of PM10 dust were collected on quartz filters Whatman QM-A by employees of Voivodship Inspectorate for Environmental Protection (VIEP) in Wroclaw in 2011. As a pilot researches in Lower Silesia were selected two monitoring points of VIEP: (i) Osieczow and (ii) Zgorzelec. Air sampling point in Osieczow is a point of regional background and it is an excellent reference base for the analyses of PM10 in Lower Silesia. The aim of monitoring in this point is to assess the exposure of ecosystems to air pollution. Sampling point in Zgorzelec reflects the urban background and the measurements will be compared, in the future, to the results of the sampling points investigated the impact of industry and local transport on air quality in the whole Lower Silesia. For further geochemical and isotopic analyses were selected 25 samples from each sampling point, average every two weeks measurement. The concentration of PM10 dust for Osieczow ranged from 7 μg·m-3 (11.10.2011r.) to 89 μg·m-3 (4.03.2011r.) with an average of 24 μg·m-3 and for Zgorzelec between 10 μg·m-3 (11.10.2011r.) and 85 μg·m-3 (9.11.2011r.) with an average of 26 μg·m-3. The mean percentage contribution of carbon in PM10 samples from Osieczow was 47%, while in Zgorzelec 42%. The obtained values of δ13C (PM10) in Osieczow varied from -31.1‰ (5.02.2011r.) to -25.5‰ (26.10.2011r.) with an average of -27.6‰, whereas in Zgorzelec between -28.6‰ (15.07.2011r.) and -25.2‰ (6.01.2011r.) with an average of -26.8‰. At the current stage of research is clearly discernible the different carbon isotope record in the material dust (qualitative information), despite the identical range of concentrations of PM10 in both analysed points (quantitative information). This confirms the appropriateness of the choice both research method and monitoring points.
Źródło:: Contemporary Trends in Geoscience; 2013, 2, 1; 101-105
2299-8179
Pojawia się w:: Contemporary Trends in Geoscience
Dostawca treści:: Biblioteka Nauki

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