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    Wyświetlanie 1-4 z 4
    Tytuł:
    Sferule z granicy Kreda-Paleogen (Lechówka, Polska) – wstępne dane
    Spherules from the Cretaceous–Paleogene boundary (Lechówka, Polska) – preliminary data
    Autorzy:
    Brachaniec, Tomasz
    Szopa, Krzysztof
    Karwowski, Łukasz
    Krzykawski, Tomasz
    Salamon, Mariusz
    Brom, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/1033022.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Cretaceous–Paleogene boundary
    impact origin
    smectite
    spherule
    spinel
    Opis:
    Samples of boundary clay from Cretaceous–Paleogene deposits from Lechówka, Poland were examined for spherules to confirm the impact origin of the sediment. The chemical composition of investigated spherules show similarities to material from the K–Pg boundary from Stevns Klint. The impact genesis of the spherules is confirmed by the presence of nickel-rich spinel grains on their surfaces. The deposits with spherules are built by smectite with Al and Mg enrichment. This cheto smectite is forming as a result of the weathering of the impact glass.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2015, 6; 17-22
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spherules associated with the Cretaceous–Paleogene boundary in Poland
    Autorzy:
    Brachaniec, T.
    Karwowski, Ł.
    Szopa, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/139277.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Cretaceous-Paleogene boundary
    Polska
    Spherule
    microkrystites
    impact origin
    Ni-rich spinels
    smectite
    kreda
    paleogen
    granica
    Polska
    geneza uderzeniowa
    smektyty
    Opis:
    The succession of the Lechówka section near Chełm in south-eastern Poland presents the first complete record of the Cretaceous–Paleogene (K–Pg) boundary in Poland. Samples of the boundary clay were examined for microtektites and shocked minerals to confirm the impact origin of the sediment. The spheroidal fraction reveals morphological and mineralogical features, e.g., spherules, similar to material from the K–Pg boundary as described from elsewhere. The impact genesis of the spherules is confirmed by the presence of nickel-rich spinel grains on their surfaces. The spinels are considered to be primary microlites and, thus, the spherules at Lechówka can be classified as microkrystites. No shocked minerals were noted. The deposits with spherules comprise Aland Mg-rich smectite (Cheto smectite). This almost pure Mg-rich smectite, forming up to 100% of the clay fraction, derived from the weathering of the impact glass. It is proposed that the spherules isolated from the Cretaceous-Paleogene boundary clay at Lechówka come from the Chicxulub crater in Mexico.
    Źródło:
    Acta Geologica Polonica; 2014, 64, 1; 99-108
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pytania o kwarc deformacyjny i szokowy
    Questions about deformed and shocked quartz
    Autorzy:
    Kosina, Romuald
    Powiązania:
    https://bibliotekanauki.pl/articles/1033004.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    deformation
    impact
    local vs allochtonic origin
    meteorites
    microstructure
    quartz
    Opis:
    Quartz, known as a common mineral on our planet, is used as a good marker of microstructural deformation created by tectonic activity or meteorite impact. Planar fractures (PFs) and planar deformation features (PDFs) are not randomly oriented in an impacted quartz crystal, but are distinctly connected to crystallographic planes. In a tectonically deformed quartz PDFs are mostly parallel to the plane (0001), but can also be bent. Recrystallization reduces the level of dislocations in such a quartz. However, the difference between both types of quartz is quantitative and not qualitative. One might expect that the impact could reactivate or induce new tectonic metamorphism and/or volcanic activity. In addition, P-T parameters decrease continuously from the impact centre toward outside. Then, intermediate forms of quartz deformation ought to be distinguished. The paper also presents the point of view that the location and identification of deformed and shocked quartz, as well as some allochtonic Scandinavian impactites, transported into the Central Europe during the last glaciation, is highly probable in areas of enhanced tectonic activity in Lower Silesia, Poland. Identification of local rocks with pseudotachylite properties and recognition of their nature, deformed versus shocked, could also be helpful here.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2014, 5; 52-71
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enceladus as a place of origin of life in Solar System
    Autorzy:
    Czechowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059372.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    life origin
    Enceladus
    panspermia
    gravity assist
    Poynting-Robertson effect
    impact
    Opis:
    Enceladus, a satellite of Saturn, with its radius of 250 km, is the smallest geologically active celestial body in the Solar System. My model of core origin and evolution indicates that for hundreds of My after accretion Enceladus was an appropriate body for an origin of life. I continue consideration of the hypothesis that Enceladus was a cradle of life in the Solar System. I found that simple organisms could be ejected in icy grains into the space by volcanic jets or by meteoroid impacts. Several mechanisms could be responsible for later transport of the grains to the early Earth and other terrestrial planets. Eventually I suggest that Enceladus is the most appropriate body for a cradle of life in the Solar System.
    Źródło:
    Geological Quarterly; 2018, 62, 1; 172--180
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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