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    Wyświetlanie 1-2 z 2
    Tytuł:
    Reconsidering the glaciogenic origin of Gondwana diamictites of the Dwyka Group, South Africa
    Autorzy:
    Molén, Mats O.
    Smit, J. Johan
    Powiązania:
    https://bibliotekanauki.pl/articles/2204360.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    surface microtexture
    sediment gravity flows
    Late Palaeozoic Ice Age
    pavement
    Nooitgedacht
    mikrotekstura powierzchni
    osad
    epoka lodowcowa
    nawierzchnie
    Opis:
    The Gondwana Late Palaeozoic Ice Age is probably best represented by the Dwyka Group in South Africa. Striated and grooved surfaces or pavements are commonly considered to have formed subglacially, as are diamictites which have been interpreted as in-situ or reworked tillites. These interpretations were tested by investigation of outcrops in formerly well-studied areas, throughout South Africa. Detailed analyses have focused on striated surfaces/pavements and surface microtextures on quartz sand grains in diamictites. The sedimentological context of four pavements, interpreter to be glaciogenic, display features commonly associated with sediment gravity flows, rather than glaciation. A total of 4,271 quartz sand grains were subsampled from outcrops that are considered mainly to be tillites formed by Continental glaciation. These grains, analysed by SEM, do not demonstrate the characteristic surface microtexture combinations of fracturing and irregular abrasion associated with Quaternary glacial deposits, but mainly a mix of surface microtextures associated with multicyclical grains. The Dwyka Group diamictites warrant reinterpretation as non-glacial sediment gravity flow deposits.
    Źródło:
    Geologos; 2022, 28, 2; 83--113
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    When did the Little Ice Age end and the Recent Global Warming Startin Hungary? Late Reflections About a Scientific Faith Debate
    Autorzy:
    RÁCZ, Lajos
    Powiązania:
    https://bibliotekanauki.pl/articles/2081254.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    historia klimatu
    zmiany klimatyczne
    mała epoka lodowcowa
    basen karpacki
    globalne ocieplenie
    climate history
    climate change
    Little Ice Age
    Recent Global Warming
    Carpathian Basin
    Opis:
    We try to fi nd answer to the question: when did the Little Ice Age end and the Recent Global Warming start in Hungary? Based on the temperature time series of Budapest and data about the freezing of the Danube from the 1810s the cooling of the climate is perceiveable. The cool-cold and rainy climate system showed two centres of gravity during the 19th century, the fi rst in the 1830s and 1840s, the second in the last two decades of the 19th century. Furthermore, despite the rising of the temperature the climate remained mostly cool and wet until the 1940s. According to the global tendencies there is no obvious climate change trend, though the temperature became colder in decades’ average, but the fl uctuations were very hectic, as usual in transition periods. The diminution in the quantity of precipitation already started in the 1940s though, and proved to be stable. The breakthrough of the Recent Global Warming’s climate system became apparent from the 1980s based on the data of Budapest’s time series. That’s when the ’mediterranean climate-scissors’ opened, and the Danube’s basin became warmer and drier. Even if we examine the tendency of the temperature and precipitation changing in the 20th century separately, we can’t get a clear picture. The warming obviously shows from the last decade of the 19th century, but according to the researchers who are sceptic about Recent Global Warming we can’t use one of the biggest cooling downs in history that occured in the last third of the 19th century as a reference point. The climate regime that was signifi cantly more pluvial than the reference period lasted till the 1940s, and there are no signs of the climate becoming signifi cantly drier prior to the 1980s. If we consider the rise of temperature as the only indicator of the Global Warming, then the warming started in the last decades of the 19th century in Hungary as well. If we consider the decrease in the amount of precipitation to be decisive, then this process started in the 1940s, although there was no signifi cant drying tendency before the 1970s.
    Źródło:
    Historyka studia metodologiczne; 2016, 46; 197-208
    0073-277X
    Pojawia się w:
    Historyka studia metodologiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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