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Późnoplejstoceński rozwój doliny Niemna w rejonie Grodna na Białorusi

Lindner L., Sańko A.

Przegląd Geologiczny

2008

Vol. 56, nr 1

73-80

Based on geological and paleobotanic data, the oldest valley system of the Niemen River is linked in the study area with a river located southward of Grodno, within a parallel valley from the Alexandrian (Mazovian) Interglacial. The foundations of the present-day, almost meridian course of the Niemen River valley, are connected with a system of post-glacial lakes from the Sozhian (Wartanian) Stadial of the Pripethian (Odranian) Glaciation, later filled with organic deposits of the Muravian (Eemian) Interglacial. Analysis of six sites with these deposits (Pyszki, Rumlówka, Poniemuń, Żukiewicze, Bohatyrowicze and Kniażewodce) indicates that they represent three lakes located at different altitudes. During the maximal range of the Dvinian (Main) Stadial of the Poozerian (Vistulian) Glaciation, the lakes were beyond the range of the ice-sheet. At this time, the highest located deposits of the Poniemuń-Żukiewicze lake were covered by sander sediments, whereas the Bohatyrowicze-Kniażewodce and Pyszki-Rumlówka lakes that were located at lower levels, were covered by fluvio-periglacial deposits and varved clays of the Skidel ice-dammed lake. Retreat of the ice-sheet of the Dvinian Stadial, resulting in outflow of water from the Skidel ice-dammed lake through the area with the two lower interglacial lakes, triggered the formation of a system of the Niemen River supra-flood terraces above them. Accumulation of the highest of these terraces (VI), during the first phase of the Skidel lake outflow, marks the beginning of the present-day Niemen River valley formation that probably began in the younger phases of the Dvinian ice-sheet retreat. Further evolution of the valley is linked with the Late Glacial formation of the middle (III-V) supra-flood terraces and with the Holocene formation of the lower (II, I) supra-flood terraces.

Palynostratigraphy of the Poozerje Glaciation (Vistulian) in Belarus

Yelovicheva Y., Sanko A.

Kwartalnik Geologiczny

1999

Vol. 43, Nr 2

203-212

A palynological examination was applied to sediments of the last glaciation (Poozerie, Vistulian) in Belarus. Accompanied by geologic setting of deposits, as well as radiocarbon and thermoluminescence dating, the Poozerie sequence could be ascribed to three substages, i.e. Kulakovo, Dvina and Naroch. The Kulakovo substage (early Poozerie) corresponds to the oxygen isotope stage 5d-a, and comprises the West Dvina megastage with the short Black Shore interstage and the megainterstage (two stages of Mirogotshi and Sloboda, and three interstages of Chericov, Suraz and Polotsk). The Dvina substage (Pleniglacial), corresponding to the oxygen isotope stages 4 and 3, consists of the Mezin and Orsha megastages and the separating megainterstage with three middle Poozerie interstages (Turov, Shapurovo and Borisov) and two stages (Rogachevo and Michalinovo). The Naroch substage (oxygen isotope stage 2) represents the Late Glacial. There are several interstages during the Poozerie Glaciation: Chericov (Amersfoort), Suraz (Brörup), Polotsk (Odderade), Turov (Moershoofd), Shapurovo (Hengelo) and Borisov (Denekamp).

Na podstawie metod palinologicznych przedstawiono podział stratygraficzny osadów ostatniego zlodowacenia (poozierskiego, wisły) na Białorusi. Badania prowadzono równolegle z badaniami geologicznymi oraz datowaniem osadów metodami radiowęgla i termoluminescencji. Wyróżniono trzy podpoziomy: kułakowski, dźwiński i naroczski. Podpoziom kułakowski, odpowiadający stadium izotopów tlenu 5d-a, składa się z megastadiału zachodniodżwińskiego i megainterstadiału (w skład którego wchodzą stadiały mirogoski i slobodski) oraz trzech interstadiałów (czerikowskiego, surażskiego i połockiego). Podpoziom dźwiński (pleniglacjał, studia izotopowe 4 i 3) zawiera dwa megastadiały (mezyński i orszański), miedzy którymi jest megainterstadiał z trzema interstadiałami (turowskim, szapurowskim i borysowskim) i dwoma stadiałami (rogaczewskim i michalinowskim). Najmłodszy podpoziom, naroczski odpowiada późnemu glacjałowi zlodowacenia poozierskiego (stadium izotopowemu 2). Odpowiednikiem interstadiału czeńkowskiego jest amersfoort, suraźskiego-brörup, połockiego - odderade, turowskiego - moershooft, szapurowskiego hengelo i borysowskiego - denekamp.