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Fluvial processes under late Pleni-Weichselian environmental conditions: a case study from the Warenka site in central Poland

Petera-Zganiacz Joanna, Brzozowicz Dorota, Pawłowski Dominik, Kaczmarek Paweł

Geologos

2024

Vol. 30, No. 2

81--94

Strong aggradational tendencies during the late Pleni-Weichselian have been noted in river valleys in central Europe. Thick series of mineral deposits were laid down, but also organic or mineral-organic horizons were formed under favourable conditions. The study area is located in the central section of the valley of the River Warta within an extraglacial area of the last glaciation. At the Warenka site alluvia, that attain thicknesses of 16 m, were analysed. Lithofacies analysis, OSL dating of mineral sediments and radiocarbon dating of organic and mineral-organic strata were performed. Organic and mineral-organic deposits were also subjected to pollen and Cladocera analyses. Together this set of analyses was used to determine fluvial processes and environmental conditions during the late Pleni-Weichselian. The results obtained allow the conclusion that these levels were deposited in the sedimentary environment of a low-energy, sand-bed braided river, which operated in the period from approximately 30 to 24 cal kBP – the late Pleni- Weichselian. During this time, there were periods when shallow water bodies were formed on the valley bottom, where deposition of organic material was possible. The presence of this type of sediment made it possible to reconstruct the vegetation cover; this had the character of a steppe-tundra, periodically shrubby steppe-tundra. Short-lived reservoirs were characterised by shallow-water settings with weakly developed vegetation and temporary influence of floodwaters as indicated by changes in cladoceran assemblages. Pollen spectra, low concentration of cladocerans, as well as the presence of the cold-tolerant Cladocera taxa are indicative of cold climatic conditions.

Arsen, antymon i selen w wodach podziemnych doliny rzeki Warty pomiędzy Poznaniem a Śremem

Siepak M.

Geologos

2005

Vol. 7 Monographiae 1

3--172

Niniejsza praca stanowi przykład pracy eksperymentalnej zrealizowanej w latach 2001-2003 na wybranych ujęciach wód podziemnych, zbiornikach wód powierzchniowych oraz osadach stanowiących warstwy wodonośne w dolinie rzeki Warty pomiędzy Poznaniem a Śremem. W pracy omówiono kształtowanie się ogólnej zawartości As, Sb i Se oraz ich nieorganicznych form specjacyjnych w wodach podziemnych badanego odcinka doliny Warty. Dokonano również charakterystyki ogólnej zawartości jak i ich nieorganicznych form specjacyjnych na tle warunków krążenia wód podziemnych i analizy migracji mikroskladników w porowym środowisku hydrogeologicznym. Przeprowadzone badania stanowią pierwsze tak kompleksowo i przestrzennie wykonane i hydrogeologicznie zinterpretowane badania mikroskładników, występujących na poziomie śladowym w skałach osadowych, wodach powierzchniowych i podziemnych doliny Warty. Na podstawie uzyskanych wyników badań wykazano, że oznaczenia ogólnej zawartości As, Sb i Se oraz ich form specjacyjnych mogą być przydatne w monitoringu jakości wód podziemnych szczególnie w rejonach antropopresji hydrodynamicznej, wywołanej w dolinach rzecznych. Wskazano, że analiza specjacyjna mikroskladników znacznie poszerza możliwości interpretacyjne w zakresie określenia genezy zanieczyszczeń wód podziemnych.

Presented study is the example of an experimental work carried in years 2001-2003 in the area of chosen wellfields, surface water reservoirs and in the water-bearing sediments of the Warta River valley between Poznań and Śrem. The formation of total As, Sb and Se contents and their inorganic species in ground water of the investigated part of the Warta valley was particularly emphasized. Besides, total contents and concentrations of the inorganic species were presented against the background of ground water circulation conditions and the analysis of microelements migration in the porous hydrogeological environment. Presented research is the first so complex spatially performed and hydrogeologically interpreted investigation of microelements, occurred at the trace level in sedimentary rocks, surface and ground water of the Warta River valley. Based on the obtained results it was shown that determinations of total arsenic, antimony and selenium contents and their speciation forms can be applied to ground water quality monitoring, especially in the regions of hydrodynamic anthropopressure induced in river valleys. Moreover, it was proved that speciation analyses of microelements widen interpretation possibilities concerned origin of ground water pollution.