Section “Groundwater in Sedimentary Basins” - Latvijas Universitāte

the formation of fresh water in the Upper Permian aquifer took place more orless regularly during the Middle and Late Weichselian, despite the fact that thearea before glaciation had been frozen over, so any water infiltration was hardlypossible. Another model of fresh groundwater formation – meltwater injectionswith high hydrostatic head – gives a better explanation of fresh groundwaterdistribution and the reason why freshwater injections reach such depths.A different interpretation of groundwater dating results, as well as a newperception of continental glacier dynamics and the mechanism of its meltwatercirculation, enable one to change the attitude not only of the almost dogmaticapproach to glacial geology, but also to modify the already settled viewpointson groundwater dynamics in aquifers during ice ages and the formation of freshgroundwater resources. Thus, we have to answer a number of new questions:supposing that part of the fresh groundwater resources in the Eastern Baltic regionhave been formed due to meltwater injections, what are their real exploitationresources? Are they possibly much smaller than we imagine? Can most of them bereasonably considered as the renewing ones?ReferencesBitinas, A. 1999. Paleoįrėžių genezė. Geologijos akiračiai 1, 24–34.Bitinas, A. 2011. Paskutinysis ledynmetis rytinės Baltijos regione. Klaipėdos universitetoleidykla. 154 p.Boulton, G. S., Caban, P. E., Gijssel van K. 1995. Groundwater flow beneath ice sheets:part I – large scale patterns. Quaternary Science Reviews 14, 545–562.Boulton, G. S., Caban, P. E., Gijssel van K., Leijinse, A., Punkari, M., 1996. The impact ofglaciation on the groundwater regime of Northwest Europe. Global and Planetary Change12, 397–413.Juodkazis, V. 1979. Pabaltijo hidrogeologijos pagrindai.Vilnius: Mokslas. 144 p.Mokrik, R. 2003. Baltijos baseino paleohidrogeologija. Neoproterozojus ir fanerozojus.Vilnius: Vilniaus universiteto leidykla. 333 p.Mokrik, R., Mažeika, J. 2006. Hidrogeochemija. Vilnius: Vilniaus universiteto leidykla.244 p.Mokrik, R., Bičkauskienė, A., Mažeika, J. 2008.Vidurio Lietuvos žemumos tektoninių lūžiųzonos nustatymas izotopiniais metodais devono vandeningajame komplekse. Geologijosakiračiai 3-4, 51–59.Vaikmäe, R. 1999. The influence of Scandinavian Ice Sheet on the formation of Estoniangroundwater. In: INQUA International Congress „The environmental background to hominidevolution in Africa”, 3-11 August 1999, Durban, South Africa: Book of Abstracts, p. 185.Vaikmäe, R., Vallner, L., Loosli, H. H., Blaser, P. C., Juillard-Tardent, M. 2001. Paleogroundwater of glacial origin in the Cambrian-Vendian aquifer of northern Estonia. In: W. M. Edmundsand C. J Milne (Eds.), Palaeowaters in coastal Europe: evolution of groundwater since the latePleistocene. Geological Society, London, Special Publications 189, 17–27.Zuzevičius, A. 2010. The groundwater dynamics in the southern part of the Baltic ArtesianBasin during the Late Pleistocene. Baltica 23 (1), 1–12.Региональная геология Прибалтики, 1989. В. И. Иодказис (Ред.). Вильнюс: Мокслас.220 с.18 The 70 th Scientific Conference of the University of Latvia