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    Tytuł:
    The earliest Pleistocene interglacials in Lithuania in the context of global environmental changes
    Autorzy:
    Baltrūnas, V.
    Zinkutė, R.
    Šeirienė, V.
    Katinas, V.
    Karmaza, B.
    Kisielienė, D.
    Stakėnienė, R.
    Pukelytė, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059977.pdf
    Data publikacji:
    2014
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    environmental changes
    geochemistry
    magnetic susceptibility
    palaeobotany
    Early-Middle Pleistocene
    Lithuania
    Opis:
    Investigations have been carried out in order to reconstruct the palaeoenvironmental changes during the earliest Pleistocene interglacials and to establish their relation to global environmental changes. Three sections in east Lithuania exposing the earliest Pleistocene lacustrine deposits lying between the Kalviai (Glacial B, Nidanian?) and Dzūkija (Sanian 1) and between Dzūkija (Sanian 1) and Dainava (Sanian 2) glacial deposits were selected for study. Until now the Šlavė-2 and Vindžiūnai-136 successions were considered to have formed during the Vindžiūnai (Augustovian?, Malopolanian) Interglacial and the Kudrė-915 succession during the Turgeliai (Cromerian IV, Ferdynandovian) Interglacial. Geochemical, palaeomagnetic, magnetic susceptibility, anisotropy of magnetic susceptibility and palaeobotanical proxies were applied to establish the cyclicity and dynamics of palaeoenvironmental change. The data obtained enable the subdivision of the section into units related to changes in the sedimentary environment. The Matuyama/Brunhes boundary and Jaramillo subchron of the Matuyama chron have been recognized in the Šlavė section. The results enable correction of the stratigraphic position of the sections studied. The sedimentation in the Šlavė section took place during the Early Pleistocene, while that at the Vindžiūnai-136 and Kudrė-915 took place during two different Middle Pleistocene interglacials.
    Źródło:
    Geological Quarterly; 2014, 58, 1; 145--162
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multilayered structure of the Dzukija and Dainava tills and their correlation in South Lithuania
    Autorzy:
    Baltrńnas, V.
    Karmaza, B.
    Pukelyte, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060202.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    South Lithuania
    Middle Pleistocene till
    sedimentology
    multilayered structure
    Opis:
    Lithuanian Pleistocene tills have a multilayered strucure, as established using borehole log data and various analytical methods. Locally it can be observed visually. The structure of the oldest Middle Pleistocene Dzńkija (Elster 1) and Dainava (Elster 2) tills was in vestigated in their areal stratotype in South Lithuania. Logs of three boreholes were chosen for detailed analysis. Their triangular distribution enables evaluation of the variation of till material in N to S and NW to SE di rec tions. Grain-size analysis was performed for tills from all three boreholes and the index of relative entropy of grain-size was calculated. The composition of the Dzńkija and Dainava tills succession indicators advances referable to at least two glaciations and their stages. The Dzńkija tills were formed by glaciers ad vancing from the north across Devonian strata. The Dainava till were left by glaciers advancing from NW across Lower Palaeozoic and Mesozoic rocks. The macroscopically homogeneous upperlayers of the Dzńkija till and the upper and lower layers of the Dainava till have a rhythmic multi layered structure revealed by log and grain-size data. The sedimentological na ture of this rhythmicity is partly shown by variation analysis of the relative entropy of grain-size composition in vertical succession. The index of relative entropy, reflect ing the de gree of mixing, allowed the destination of four zones of entropy (better mixing) in the vertical succession. These zones some times correlate well between widely separated sections. Their presence may be explained by a repeated in put of till material into the basal part of the glacier during its activation (stage, phase).
    Źródło:
    Geological Quarterly; 2008, 52, 1; 91-91
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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