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    Wyświetlanie 1-3 z 3
    Tytuł:
    Evidence that the fossil insect trackway Bifurculapes laqueatus Hitchcock, 1858 was made underwater
    Autorzy:
    Getty, Patrick R.
    Powiązania:
    https://bibliotekanauki.pl/articles/138699.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aquatic
    ichnology
    arthropods
    mesozoic
    Jurassic
    wodny
    ichnologia
    stawonogi
    mezozoik
    jura
    Opis:
    Three trackways attributable to the ichnospecies Bifurculapes laqueatus Hitchcock, 1858 found in Lower Jurassic rocks of the Newark Supergroup in northeastern North America are preserved in association with current lineations. Each trackway takes turns so that parts of the trackway parallel the current lineations. This parallelism is interpreted as evidence that the trackmakers were entrained in flowing water and had to change course due to the current. If this interpretation is correct, then morphological differences between B. laqueatus and terrestrial insect trackways could be explained by the trackmaker moving subaqueously. Further, B. laqueatus would constitute only the second insect trackway from this region to be recognized as being made subaqueously. From an ecological standpoint, the aquatic insects that made B. laqueatus were probably near the base of the local food chain, the apex predators of which were piscivorous theropod dinosaurs.
    Źródło:
    Acta Geologica Polonica; 2020, 70, 1; 125-133
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mnin restraining stepover – evidence of significant Cretaceous–Cenozoic dextral strike-slip faulting along the Teisseyre-Tornquist Zone?
    Autorzy:
    Konon, A.
    Ostrowski, S.
    Rybak-Ostrowska, B.
    Ludwiniak, M.
    Śmigielski, M.
    Wyglądała, M.
    Uroda, J.
    Kowalczyk, S.
    Mieszkowski, R.
    Kłopotowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/138980.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    strike-slip fault pattern
    restraining stepover
    Permo-Mesozoic cover
    Holy Cross Mountains Fold Belt
    uskok przesuwczy
    pokrywa
    perm
    mezozoik
    Góry Świętokrzyskie
    Opis:
    A newly recognized Mnin restraining stepover is identified in the Permo-Mesozoic cover of the western part of the Late Palaeozoic Holy Cross Mountains Fold Belt (Poland), within a fault pattern consisting of dextral strikeslip faults. The formation of a large contractional structure at the Late Cretaceous – Cenozoic transition displays the significant role of strike-slip faulting along the western border of the Teisseyre-Tornquist Zone, in the foreland of the Polish part of the Carpathian Orogen. Theoretical relationships between the maximum fault offsets/ mean step length, as well as between the maximum fault offsets/mean step width allowed the estimation of the values of possible offsets along the Snochowice and Mieczyn faults forming the Mnin stepover. The estimated values suggest displacements of as much as several tens of kilometres. The observed offset along the Tokarnia Fault and theoretical calculations suggest that the strike-slip faults west of the Late Palaeozoic Holy Cross Mountains Fold Belt belong to a large strike-slip fault system. We postulate that the observed significant refraction of the faults forming the anastomosing fault pattern is related also to the interaction of the NW-SE-striking faults formed along the western border of the Teisseyre-Tornquist Zone and the reactivated WNW-ESE-striking faults belonging to the fault systems of the northern margin of the Tethys Ocean.
    Źródło:
    Acta Geologica Polonica; 2016, 66, 3; 429-449
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fluid pathways within shallow-generated damage zones of strike-slip faults – evidence of map-scale faulting in a continental environment, SW Permo-Mesozoic cover of the Late Palaeozoic Holy Cross Mountains Fold Belt, Poland
    Autorzy:
    Rybak-Ostrowska, Barbara
    Konon, Andrzej
    Hurai, Vratislav
    Bojanowski, Maciej
    Konon, Agnieszka
    Wyglądała, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/139101.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    strike-slip faulting
    fluid pathways
    continental environments
    Chmielnik releasing stepover
    Permo-Mesozoic cover
    Holy Cross Mountains Fold Belt
    uskok przesuwczy
    środowisko lądowe
    pokrywa
    perm
    mezozoik
    Góry Świętokrzyskie
    Opis:
    The damage zones of exhumed strike-slip faults dissecting Jurassic carbonates in the south-western part of the Late Palaeozoic Holy Cross Mountains Fold Belt reveal second-order faults and fractures infilled with syntectonic calcite. The subsequent development of a structural pattern of microscopic fault-related structures and calcite infillings reflects the activity of strike-slip faults that began in the Late Cretaceous (Late Maastrichtian) and lasted until the early Miocene (Langhian). The fabric of the syntectonic veins provides insights into the evolution of the permeable fault-related structures that were the main pathways for fluid flow during fault activity. Microstructural study of calcite veins coupled with stable isotope and fluid inclusion data indicates that calcite precipitated primarily in a rock-buffered system related to strike-slip fault movement, and secondarily in a partly open system related to the local activity of the releasing Chmielnik stepover or the uplift of the area. The presence of meteoric fluids descending from the surface into damage zones suggest that the strike-slip faulting might have taken place in a nonmarine, continental environment.
    Źródło:
    Acta Geologica Polonica; 2020, 70, 1; 1-29
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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