Geological Survey of Finland, Special Paper 46 - arkisto.gsf.fi

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Geological Survey of Finland, Special Paper 46 Peter Johansson Semenova, L. 2006. The types of till in the northwestern Kola Peninsula, Russia. In: Johansson, P., Lunkka J.-P. & Sarala, P. (eds.) Late Pleistocene glacigenic deposits in the central part of the Scandinavian ice sheet. The INQUA Peribaltic Group fi eld symposium in Finland, September 11.–15. 2006. Abstracts, 41. Sollid, J. L., Andersen, S., Hamre, M., Kjeldsen, O., Salvigsen, O., Sturød, S., Tveitå, T. & Wilhelmsen, A. 1973. Deglaciation of Finnmark, North Norway. Norsk geografi sk Tidskrift 27, 233–325. Taipale, K. & Saarnisto, M. 1991. Tulivuorista jääkausiin, Suomen maankamaran kehitys. Porvoo: WSOY. 416 p. Tanner, V. 1915. Studier öfver kvartärsystemet i Fennoskandias nordliga delar III. (Résumé en français: Études sur le système qua ternaire dans les parties septentrionales de la Fennoscan die). Bulletin de la Commission géologique de Finlande 38. 815 p. 54 Tanner, V. 1938. Det senglasiala havets utbredning i Lutto och Suomu älvarnas dalgångar ovanför sammanfl ödet samt några ord om morfologien enna trakt. (Résumé en français: L’extension de la mer senglaciaire dans les vallées des rivières Lutto et Suomu en Laponie en amont de leur confl uent). Bulletin de la Commission géologique de Finlande 115, 107–119. Yevzerov, V. Ya & Koshechkin, B. I. 1980. paleogeography of the Pleistocene on the western Kola Peninsula. Leningrad: Nauka. 105 p. (in Russian) Yevzerov, V. Ya & Kolka, V. 1993. End moraines of Younger Dryas and deglaciation of northern and central Kola peninsula. In: Yevzerov, V. Ya. (ed.) Eastern Fenniscandian Younger Dryas End Moraines and Deglaciation. Excursion guide. Apatity, 5–38.
Applied Quaternary research in the central part of glaciated terrain, edited by Peter Johansson and Pertti Sarala. Geological Survey of Finland, Special Paper 46, 55–62, 2007. LATE WEICHSELIAN SHEETFLOW DRAINAGE OF SUBGLACIAL LOKKA ICE LAKE by Raimo Sutinen 1 , Mari Jakonen 2 , Pauliina Liwata 1 and Eija Hyvönen 1 Sutinen, R., Jakonen, M., Liwata, P. & Hyvönen, E. 2007. Late Weichselian sheetfl ow drainage of subglacial Lokka ice lake. Applied Quaternary research in the central part of glaciated terrain. Geological Survey of Finland, Special Paper 46, 55–62, 6 fi gures. A conceptual model regards arboreal eskers as products of time-transgressive glaciofl uvial deposition within close proximity of the retreating ice margin. In contrast, an anastomosing network of tunnel valleys or esker tracks is attributed to subglacial fl ood events, but the outburst release mechanisms of former subglacial meltwater bodies have remained obscure. We studied an anastomosing network of esker tracks in Lokka, east-central Finnish Lapland. Sheetfl ow paleohydrography as compiled with a digital elevation model (DEM) and airborne gamma-ray (AGR) data disputes the concept of ice-marginal deposition, but the network displays evidence of subglacial mass-fl ows. The tracks show convex-up parts in their long profi les and cross topography regardless of slope indicating a subglacial origin beneath the Fennoscandian Ice Sheet (FIS). The alignment of the esker tracks, fanning out to southeast and south seems to be generated from a large subglacial reservoir beneath the FIS, and we propose that the former Lokka ice-lake had been the source of the sheetfl ow system. The coincidence of escarpments (DEM) and airborne magnetic (AM) anomalies suggests that neotectonic fault instability likely was the triggering mechanism for the outburst of the subglacial Lake Lokka. Key words (GeoRef Thesaurus, AGI): glacial geology, subglacial lakes, meltwater, drainage patterns, eskers, neotectonics, Pleistocene, Weichselian, Lokka, Lapland Province, Finland. 1 Geological Survey of Finland, P.O. Box 77, FI-96101 Rovaniemi, Finland 2 University of Oulu, Dept. of Geosciences, FI-90570 Oulu, Finland E-mail: raimo.sutinen@gtk.fi , marijako@mail.student.oulu.fi pauliina.liwata@gtk.fi , eija.hyvonen@gtk.fi 55
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GEOLOGICAL SURVEY OF FINLAND Specia
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Johansson, P. & Sarala, P. (eds.) 2
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