Wyniki wyszukiwania - BazTech

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Geneza mis jeziornych Pojezierza Łęczyńsko-Włodawskiego : hipotezy a rzeczywistość rozwoju krasu węglanowego

Janiec B.

Przegląd Geologiczny

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2014

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Vol. 62, nr 5

257--266

EN

The article concerns the controversy on the four hypotheses of karst origin of lake basins in Upper Cretaceous carbonates of the Łęczna-Włodawa Lakeland (central-eastern Poland; Fig. 1). The hypotheses assume that the lake basins (Fig. 2) developed in the Holocene with the active morphogenetic participation of subartesian waters. The main problem is the lack of references to the laws of thermochemistry and kinetics of dissolution of carbonate rocks. In the Ca2+ and HCO3 concentrations in the medium solution (Tab. 1), rationally adopted for this work, the values of the enthalpy, entropy and Gibbs potential/free energy have been calculated (formulas: 9, 10 and 11). Using the conductometric method (Tab. 2, Figs. 3 and 4), the kinetics of dissolution of carbonate basement rocks, i.e. reaction rate v (formula 13), rate constant k (14a), and reaction half-life t1/2 (15), have also been determined. These investigations show that the theses formulated in the hypotheses are not acceptable. The rationale for such an assessment is the incompatibility of the assumptions of the hypotheses with the first and second law of thermochemistry. The second important reason is the ignoring of chemical kinetics as an indirect indicator of the time of the formation of the karst features. According to the author, the main period of the formation of lake basins, in terms of their origin, should be associated with palaeokarst of Neogene deposits.

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Timing of the final disappearance of permafrost in the central European Lowland, as reconstructed from the evolution of lakes in N Poland

Błaszkiewicz M.

Geological Quarterly

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2011

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Vol. 55, No. 4

361-374

EN

Accumulation of sediments in the lake basins of the Starogard Lakeland, Northern Poland, an area which was entirely ice-covered during the last glaciation, started at different times, beginning during the Late Glacial. Sedimentation continued till the beginning of the Holocene (Preboreal). The principal factor causing the asynchronous start of the lake development was the variation in melting processes of buried dead-ice blocks. The preservation of dead-ice masses in some depressions until the Preboreal leads to the conclusion that the ultimate disappearance of permafrost in the study area occurred only at the beginning of the Holocene.

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Zbiorniki jeziorne okolic Kalisza w świetle analizy pyłkowej (Nizina Wielkopolska)

Malkiewicz M.

Biuletyn Państwowego Instytutu Geologicznego

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2008

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nr 428

55-63

PL

W artykule przedstawiono wyniki badań palinologicznych osadów jeziornych i torfów z okolic Kalisza. Analizie pyłkowej poddano dwa profile W44 i W48 z Grudzielca Nowego oraz profil z Gutowa. Diagramy pyłkowe przedstawiają sukcesję roślinności charakterystyczną dla schyłku zlodowacenia warty, interglacjału eemskiego i wczesnego glacjału zlodowacenia wisły. Wyniki badań porównano z wcześniej uzyskanymi danymi z sąsiednich stanowisk: Grudzielec Nowy, Bieganin, Kwiatków Las i Gałązki Wielkie. We wszystkich zbiornikach miała miejsce sedentacja torfów na przemian z akumulacją mułków mineralnych i organicznych o różnej miąższości. Badania palinologiczne pozwoliły stwierdzić, że sedymentacja osadów w badanych zbiornikach rozpoczęła się prawie jednocześnie i miała prawie ten sam przebieg, lecz zakończyła się w różnych odcinkach plejstocenu.

EN

The paper presents the results of palynological investigations of lacustrine deposits from the W44, W48 sections at Grudzielec Nowy, and from Gutów near Kalisz. The vegetation succession is characteristic of the Eemian Interglacial with protocratic, mesocratic and thelocratic phases. In the Gutów section, Wartanian Glaciation and Vistulian Glaciation sediments occur above the interglacial deposits. The results were compared with earlier data from nearby localities of Grudzielec Nowy, Bieganin, Kwiatków Las and Gałązki Wielkie. Two types of the Eemian lake basins existed in the Kalisz Upland. At Grudzielec Nowy and Bieganin, they formed in a subglacial trough dated for the Wartanian Glaciation. At Kwiatków Las, Gałązki Wielkie and Gutów, those were closed basins developed from melting of dead-ice blocks. Deposition of peats and organic and mineral silts of different thicknesses occurred in all the lakes. Palynological investigations proved that the deposition started almost at the same time - at the beginning of the Eemian Interglacial, but it finished during different Pleistocene phases.