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Geological Quarterly

Tytuł artykułu

Multilayered structure of the Dzukija and Dainava tills and their correlation in South Lithuania

Autorzy Baltrńnas, V.  Karmaza, B.  Pukelyte, V. 
Treść / Zawartość
Warianty tytułu
Języki publikacji EN
EN 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).
Słowa kluczowe
EN South Lithuania   Middle Pleistocene till   sedimentology   multilayered structure  
Wydawca Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
Czasopismo Geological Quarterly
Rocznik 2008
Tom Vol. 52, No 1
Strony 91--91
Opis fizyczny –99, bibliogr. 38 poz., rys., tab., wykr.
autor Baltrńnas, V.
autor Karmaza, B.
autor Pukelyte, V.
  • Institute of Geology and Geography, T. Ševčenkos 13, LT-03223 Vilnius, Lithuania,
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