<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">The study of the deglaciation chronology in the south-eastern Baltic Region belonging to the outer zone of the last Pleistocene glaciation has a long history. The Finnish investigator H. Hausen (1913) who worked in the north-western portion of the East-European Plain at the beginning of the 20th century was the first to attempt a reconstruction of the course of glacial retreat during the last glaciation. At that time investigators had no physical dating methods and the time scale based on varvometric method, introduced by the Swedish geologist G. de Geer (1912) who divided the deglaciation history of Scandinavia into Daniglacial, Gotiglacial and Finiglacial, each of which had different palaeoglaciological conditions. During last decades different dating methods, including 14C, ESR, luminescence methods and 10Be techniques have been used, but they could not help essentially improve the existing stratigraphical charts and many problems of topical interest in the history of deglaciation have not been solved yet. During last years the first two authors have studied the suitability of OSL method for the geochronological purposes, paying the most attention to the waterlaid sediments. In the first step they have found the most promising genetical varieties of glaciofluvial sediments (glaciofluvial deltas and sandurs) and in this paper they widened the study area to all three Baltic states with close cooperation with Latvian and Lithuanian colleagues. The obtained results demonstrated, that not all mineral grains in the uppermost glaciofluvial and glaciolacustrine sediments were fully bleached during the last deglaciation. Probably the older sediments also influenced to the luminescence results. It means, that stratigraphic conclusions based on single dates or their small sets are inadmissible and in each case luminiscence dating requires a verification using other methods.</abstract>

The study of the deglaciation chronology in the south-eastern Baltic Region belonging to the outer zone of the last Pleistocene glaciation has a long history. The Finnish investigator H. Hausen (1913) who worked in the north-western portion of the East-European Plain at the beginning of the 20th century was the first to attempt a reconstruction of the course of glacial retreat during the last glaciation. At that time investigators had no physical dating methods and the time scale based on varvometric method, introduced by the Swedish geologist G. de Geer (1912) who divided the deglaciation history of Scandinavia into Daniglacial, Gotiglacial and Finiglacial, each of which had different palaeoglaciological conditions. During last decades different dating methods, including 14C, ESR, luminescence methods and 10Be techniques have been used, but they could not help essentially improve the existing stratigraphical charts and many problems of topical interest in the history of deglaciation have not been solved yet. During last years the first two authors have studied the suitability of OSL method for the geochronological purposes, paying the most attention to the waterlaid sediments. In the first step they have found the most promising genetical varieties of glaciofluvial sediments (glaciofluvial deltas and sandurs) and in this paper they widened the study area to all three Baltic states with close cooperation with Latvian and Lithuanian colleagues. The obtained results demonstrated, that not all mineral grains in the uppermost glaciofluvial and glaciolacustrine sediments were fully bleached during the last deglaciation. Probably the older sediments also influenced to the luminescence results. It means, that stratigraphic conclusions based on single dates or their small sets are inadmissible and in each case luminiscence dating requires a verification using other methods.

Chronology of the Last Deglaciation in the Southeastern Baltic Region on the Basis of Recent OSL Dates

Iinstitute of Geology, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia

Institute of Geology, Adam Mickiewicz University, Makow Polnych 16, 61-606 Poznan, Poland

Department of Geomorphology and Geomatics, University of Latvia, Rainis Blvd. 19, LV 1586 Riga, Latvia

Institute of Geology and Geography, T. Shevcenkos 13, 03223 Vilnius, Lithuania

Geochronometria

The study of the deglaciation chronology in the south-eastern Baltic Region belonging to the outer zone of the last Pleistocene glaciation has a long history....

Chronology of the Last Deglaciation in the Southeastern Baltic Region on the Basis of Recent OSL Dates

Publié en ligne: 16 sept. 2010

Pages: 47 - 54

DOI: https://doi.org/10.2478/v10003-010-0011-7

Mots clés
deglaciation chronology, South-eastern Baltic Region, ice marginal formations, glaciofluvial deposits, TL and OSL dates

This content is open access.

Chronology of the Last Deglaciation in the Southeastern Baltic Region on the Basis of Recent OSL Dates

Publié en ligne: 16 sept. 2010

Pages: 47 - 54

DOI: https://doi.org/10.2478/v10003-010-0011-7

Mots clésdeglaciation chronology, South-eastern Baltic Region, ice marginal formations, glaciofluvial deposits, TL and OSL dates

This content is open access.

Mots clés
deglaciation chronology, South-eastern Baltic Region, ice marginal formations, glaciofluvial deposits, TL and OSL dates