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    Wyświetlanie 1-3 z 3
    Tytuł:
    A multi-analytical approach for the analysis of cation distribution in a aluminoceladonite structure
    Autorzy:
    Kądziołka-Gaweł, Mariola
    Dulski, Mateusz
    Czaja, Maria
    Krzykawski, Tomasz
    Szubka, Magdalena
    Powiązania:
    https://bibliotekanauki.pl/articles/2172615.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminoceladonite
    ions position characterization isomorphic substitutions
    Fe bearing phyllosilicates
    X-ray photoelectron spectroscopy
    Mössbauer spectroscopy
    Raman spectroscopy
    glinokrzemiany
    krzemiany warstwowe
    rentgenowska spektrometria fotoelektronów
    XPS
    spektroskopia mössabuerowska
    spektroskopia Ramana
    Opis:
    In this paper cation arrangement in two samples of aluminoceladonite, emerald green and dark-green were studied by Mössbauer, Raman and X-ray photoelectron spectroscopies. The X-ray photoelectron spectroscopy (XPS) spectra obtained in the region of the Si2p, Al2p, Fe2p, K2p, and O1s core levels provided information, for the first time highlighting a route to identify the position of Si, Al, K, and Fe cations in a structure of layered silicates. The XPS analysis showed the presence of Al in tetrahedral and octahedral coordination while the K2p line indicated the possibility of K+ substitution by other cations in interlayer sites. Mössbauer spectroscopy provided information about crystal chemistry with respect to the local electronic and geometric environment around the Fe atom and to distortions of the polyhedra. It turned out that iron was located mostly in the cis-octahedra position wherein about 75% of iron appeared in the form of Fe3+. The most preferred cation combinations around Fe corresponded to 3Fe3+ ions and MgFe2+Fe3+/2MgFe3+. Raman spectroscopy illustrated aluminium substitution in silicon and iron positions wherein the concentration of the aluminium determined the degree of structural distortion within the layered system. These isomorphic substitutions implied a typical band arrangement in the hydroxyl region, which has not been observed in celadonites so far.
    Źródło:
    Acta Geologica Polonica; 2022, 72, 3; 353--368
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal history of the Carboniferous strata in the northern part of the Intra-Sudetic Basin (SW Poland): A combined Raman spectroscopy and organic petrography study
    Autorzy:
    Botor, Dariusz
    Toboła, Tomasz
    Waliczek, Marta
    Powiązania:
    https://bibliotekanauki.pl/articles/1835585.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Raman spectroscopy
    vitrinite reflectance
    dispersed organic matter
    coalification
    Lower Silesia Coal District
    Bohemian Massif
    spektroskopia Ramana
    refleksyjność witrynitu
    rozproszona materia organiczna
    uwęglenie
    Dolnośląskie Zagłębie Węglowe
    Masyw Czeski
    Opis:
    Raman spectroscopy and vitrinite reflectance measurements of dispersed organic matter from Carboniferous shales in boreholes in the northern part of the Intra-Sudetic Basin were used for thermal history reconstruction. Microscopic investigations have shown that the organic matter is dominated by the vitrinite maceral group. In analysed samples, organic matter shows a varied degree of thermal alteration determined by the mean random vitrinite reflectance (VRo) ranging from 0.72% to 3.80%. Mean apparent maximum vitrinite reflectance (R’max) values reached 4.98%. The full width at half maximum of D1 and G bands in Raman spectra are well-correlated with mean VRo and R’max. Thermal maturity in the boreholes shows a regular increase with depth. Geological data combined with Raman spectroscopy and mean vitrinite reflectance results indicate that the analysed Carboniferous strata reached maximum paleotemperatures from c. 110 to c. 265°C. The regional paleogeothermal gradient in the late Paleozoic was c. 80°C/km. The Variscan heating event presumably caused a major coalification process of organic matter. The Carboniferous–Permian magmatic activity must have contributed to high heat flow, adding to the effect of sedimentary burial on the thermal maturity.
    Źródło:
    Acta Geologica Polonica; 2020, 70, 3; 363--396
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal history of the Carboniferous strata in the northern part of the Intra-Sudetic Basin (SW Poland): A combined Raman spectroscopy and organic petrography study
    Autorzy:
    Botor, Dariusz
    Toboła, Tomasz
    Waliczek, Marta
    Powiązania:
    https://bibliotekanauki.pl/articles/139342.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Raman spectroscopy
    vitrinite reflectance
    dispersed organic matter
    coalification
    Lower Silesia Coal District
    Bohemian Massif
    spektroskopia Ramana
    refleksyjność witrynitu
    rozproszona materia organiczna
    uwęglenie
    Dolnośląskie Zagłębie Węglowe
    Masyw Czeski
    Opis:
    Raman spectroscopy and vitrinite reflectance measurements of dispersed organic matter from Carboniferous shales in boreholes in the northern part of the Intra-Sudetic Basin were used for thermal history reconstruction. Microscopic investigations have shown that the organic matter is dominated by the vitrinite maceral group. In analysed samples, organic matter shows a varied degree of thermal alteration determined by the mean random vitrinite reflectance (VRo) ranging from 0.72% to 3.80%. Mean apparent maximum vitrinite reflectance (R’max) values reached 4.98%. The full width at half maximum of D1 and G bands in Raman spectra are well-correlated with mean VRo and R’max. Thermal maturity in the boreholes shows a regular increase with depth. Geological data combined with Raman spectroscopy and mean vitrinite reflectance results indicate that the analysed Carboniferous strata reached maximum paleotemperatures from c. 110 to c. 265°C. The regional paleogeothermal gradient in the late Paleozoic was c. 80°C/km. The Variscan heating event presumably caused a major coalification process of organic matter. The Carboniferous–Permian magmatic activity must have contributed to high heat flow, adding to the effect of sedimentary burial on the thermal maturity.
    Źródło:
    Acta Geologica Polonica; 2020, 70, 3; 363-396
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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