This thesis examines the chronology of Weichselian Glaciation, maximum extent of Scandinavian Ice... more This thesis examines the chronology of Weichselian Glaciation, maximum extent of Scandinavian Ice Sheet (SIS) and its glacial advance and decay dynamics in western part of the East European Plain (EEP). Knowledge about temporal and spatial dynamics of former ice sheets would allow us to predict the response of current glaciers to globally warming climate. The study area of the thesis encompasses the SE sector of the SIS between the Baltic Sea and the Last Glacial Maximum (LGM) position in the western part of the EEP. The Weichselian Glaciation is most extensively studied; however chronological data are unevenly distributed. Still, the occurrence of Early to Middle Weichselian glaciation in this region remains controversial because the advancing ice sheet has a great destructive potential for soft unconsolidated sediments and most of the sediments of former glaciations have been removed. However, evidence of glacial sediments attributed to the Middle Weichselian has been found in sev...
ABSTRACT The database consisting of radiocarbon (14C), optically stimulated luminescence (OSL), t... more ABSTRACT The database consisting of radiocarbon (14C), optically stimulated luminescence (OSL), thermoluminescence (TL) and beryllium (10Be) dates was used for timing the advance of the Late Weichselian Scandinavian Ice Sheet (SIS), determining the age of the Last Glacial Maximum (LGM) and the rate of deglaciation. The study area encompasses the southeastern sector of the last SIS between the Baltic Sea and LGM position in the western part of the East European Plain, coinciding with the Karelian ice stream complex (ISC) area in the east and with the Baltic ISC area in the west. The linear advance and recession rates of the last SIS were estimated as being between 110 and 330 m a-1 and 50 and 170 m a-1, respectively. The onset of the last SIS in the Karelian ISC area reached the western shores of Latvia not before 26 OSL ka and in the Baltic ISC area, on the southern shores of the Gulf of Finland, not before 21 OSL ka. The last SIS reached close to the LGM position earliest in NW Belarus, not earlier than 22.6 cal. 14C ka BP, and latest in the NE of Belarus, not earlier than 19.1 cal. 14C ka BP. The Baltic ISC area, between the LGM position and the western shores of Latvia, were deglaciated in about 8 ka and in the Karelian ISC area, between the LGM position and the southern shores of the Gulf of Finland, in about 2.6 ka. The whole area between the LGM position and Baltic Sea was deglaciated between 14.2 10Be and 13.3 cal. 14C ka BP.
Väitekirja elektrooniline versioon ei sisalda publikatsioone.Doktoritöö uurib Weichseli jäätumise... more Väitekirja elektrooniline versioon ei sisalda publikatsioone.Doktoritöö uurib Weichseli jäätumise ajalist kulgu, liustiku maksimaalse leviku ulatust ja liustiku pealetungi ja taandumise dünaamikat Ida-Euroopa tasandiku lääneosas. Uuringuala hõlmab Skandinaavia jäätumise kagusektorit Läänemerest kuni viimase jäätumise maksimaalse leviku piirini. See ala on Weichseli jäätumise jooksul mitmeid kordi allunud liustike tegevusele. Varasemate liustike ajalis-ruumilise dünaamika välja selgitamine on oluline, et ennustada praegu eksisteerivate liustike reageerimist järjest soojenevale kliimale. Varasemate liustike dünaamikat saab välja selgitada kronoloogiliste uuringute abil, mis on ka käesolev doktoritöö teemaks. Teadmised Weichseli jäätumise ajalis-ruumilise kulgemise kohta Ida-Euroopa tasandikul on vaatamata mitmekülgsetele uuringutele väga lünklikud ja olemasolevad andmed jäätumisala lõikes ebaühtlased. Eriti puudulik info on varasemate Vara- ja Kesk-Weichseli jäätumise kohta, kuna sell...
This study examines the chronology of Late Weichselian glaciation, maximum extent of Scandinavian... more This study examines the chronology of Late Weichselian glaciation, maximum extent of Scandinavian Ice Sheet (SIS) and its glacial advance and decay dynamics in western part of the East European Plain. The study area encompasses the SE sector of the SIS between the Baltic Sea and the Last Glacial Maximum (LGM) position in the western part of the East European Plain (Fig. 1.). The Late Weichselian glaciation is most extensively studied; however chronological data are unevenly distributed and the timing of the advance of the last SIS and its arrival to maximum extent and deglaciation are continuously debated. This has necessitated the revision of the chronological data. In current study the behaviour of the SIS during the Weichselian Glaciation on East European Plain is discussed through the collection, review and synchronization of all available chronological data (14C, OSL, TL, 10Be). As two different ice streams were operating during the Late Weichselian in the western part of the E...
Radiocarbon and optically stimulated luminescence dates, together with bio- and lithostratigraphi... more Radiocarbon and optically stimulated luminescence dates, together with bio- and lithostratigraphical data, revealed an interval of ice-free conditions between 72.2 OSL and 33.8 cal 14C ka BP at the Kileshino site (Valdaj Upland, Russia), corresponding to Marine Isotope Stages (MIS) 4 and 3. Limnic sedimentation conditions occurred at the Kileshino site between 57.5 OSL and 33.8 cal 14C ka BP, corresponding to MIS 3 megainterstadial in European Russia (Oerel to Hengelo interstadials in Central Europe). During the last glaciation, a sedimentary unit of laminated silt and sand of fluvial origin was redeposited at that site due to expansion of the Scandinavian Ice Sheet (SIS). This unit expresses fluvial sedimentation conditions NW of Kileshino between 72.2 and 40.8 OSL ka. All dates together suggest that the Kileshino site was ice-free between 72.2 OSL and 33.8 cal 14C ka BP. The sedimentary unit of laminated silt and sand was redeposited at the Kileshino site during the last SIS not before 33.8 cal 14C ka BP, according to previous studies, possibly at its maximum extent between 19.1 cal 14C BP and 18 OSL ka. Only one till, younger than 72.2 ka, was found from the Kileshino outcrop. It can be concluded that the SIS reached this area only once during the last 72.2 ka in the late Valdaj (Weichselian), after 33.8 cal 14C ka BP. The expansion of the SIS to the study area between 115 and 58 ka could be neither proved nor disproved as there is no chronological information about the time between 115 and 72.2 ka.
A database consisting of radiocarbon (14C), optically stimulated luminescence (OSL), thermolumine... more A database consisting of radiocarbon (14C), optically stimulated luminescence (OSL), thermoluminescence (TL) and beryllium (10Be) dates was used for timing the advance of the Late Weichselian Scandinavian Ice Sheet (SIS), determining the age of the Last Glacial Maximum (LGM) and the rate of deglaciation. The study area encompasses the southeastern sector of the last SIS between the Baltic Sea and the LGM position in the western part of the East European Plain, covering the Karelian Ice-Stream Complex (ISC) area in the east and the Baltic ISC area in the west. The linear advance and recession rates of the last SIS were estimated to be between 110 and 330 m a−1 and between 50 and 170 m a−1, respectively. The onset of the last SIS in the Karelian ISC area reached the western shores of Latvia not before 26 OSL ka, and in the Baltic ISC area, on the southern shores of the Gulf of Finland, not before 21 OSL ka. The last SIS reached close to the LGM position earliest in NW Belarus, not earlier than 22.6 cal. 14C ka BP, and latest in the NE of Belarus, not earlier than 19.1 cal. 14C ka BP. The Baltic ISC area between the LGM position and the western shores of Latvia was deglaciated in about 8 ka, and in the Karelian ISC area, between the LGM position and the southern shores of the Gulf of Finland, in about 2.6 ka. The whole area between the LGM position and the Baltic Sea was deglaciated between 14.2 10Be ka and 13.3 cal. 14C ka BP.
This thesis examines the chronology of Weichselian Glaciation, maximum extent of Scandinavian Ice... more This thesis examines the chronology of Weichselian Glaciation, maximum extent of Scandinavian Ice Sheet (SIS) and its glacial advance and decay dynamics in western part of the East European Plain (EEP). Knowledge about temporal and spatial dynamics of former ice sheets would allow us to predict the response of current glaciers to globally warming climate. The study area of the thesis encompasses the SE sector of the SIS between the Baltic Sea and the Last Glacial Maximum (LGM) position in the western part of the EEP. The Weichselian Glaciation is most extensively studied; however chronological data are unevenly distributed. Still, the occurrence of Early to Middle Weichselian glaciation in this region remains controversial because the advancing ice sheet has a great destructive potential for soft unconsolidated sediments and most of the sediments of former glaciations have been removed. However, evidence of glacial sediments attributed to the Middle Weichselian has been found in sev...
ABSTRACT The database consisting of radiocarbon (14C), optically stimulated luminescence (OSL), t... more ABSTRACT The database consisting of radiocarbon (14C), optically stimulated luminescence (OSL), thermoluminescence (TL) and beryllium (10Be) dates was used for timing the advance of the Late Weichselian Scandinavian Ice Sheet (SIS), determining the age of the Last Glacial Maximum (LGM) and the rate of deglaciation. The study area encompasses the southeastern sector of the last SIS between the Baltic Sea and LGM position in the western part of the East European Plain, coinciding with the Karelian ice stream complex (ISC) area in the east and with the Baltic ISC area in the west. The linear advance and recession rates of the last SIS were estimated as being between 110 and 330 m a-1 and 50 and 170 m a-1, respectively. The onset of the last SIS in the Karelian ISC area reached the western shores of Latvia not before 26 OSL ka and in the Baltic ISC area, on the southern shores of the Gulf of Finland, not before 21 OSL ka. The last SIS reached close to the LGM position earliest in NW Belarus, not earlier than 22.6 cal. 14C ka BP, and latest in the NE of Belarus, not earlier than 19.1 cal. 14C ka BP. The Baltic ISC area, between the LGM position and the western shores of Latvia, were deglaciated in about 8 ka and in the Karelian ISC area, between the LGM position and the southern shores of the Gulf of Finland, in about 2.6 ka. The whole area between the LGM position and Baltic Sea was deglaciated between 14.2 10Be and 13.3 cal. 14C ka BP.
Väitekirja elektrooniline versioon ei sisalda publikatsioone.Doktoritöö uurib Weichseli jäätumise... more Väitekirja elektrooniline versioon ei sisalda publikatsioone.Doktoritöö uurib Weichseli jäätumise ajalist kulgu, liustiku maksimaalse leviku ulatust ja liustiku pealetungi ja taandumise dünaamikat Ida-Euroopa tasandiku lääneosas. Uuringuala hõlmab Skandinaavia jäätumise kagusektorit Läänemerest kuni viimase jäätumise maksimaalse leviku piirini. See ala on Weichseli jäätumise jooksul mitmeid kordi allunud liustike tegevusele. Varasemate liustike ajalis-ruumilise dünaamika välja selgitamine on oluline, et ennustada praegu eksisteerivate liustike reageerimist järjest soojenevale kliimale. Varasemate liustike dünaamikat saab välja selgitada kronoloogiliste uuringute abil, mis on ka käesolev doktoritöö teemaks. Teadmised Weichseli jäätumise ajalis-ruumilise kulgemise kohta Ida-Euroopa tasandikul on vaatamata mitmekülgsetele uuringutele väga lünklikud ja olemasolevad andmed jäätumisala lõikes ebaühtlased. Eriti puudulik info on varasemate Vara- ja Kesk-Weichseli jäätumise kohta, kuna sell...
This study examines the chronology of Late Weichselian glaciation, maximum extent of Scandinavian... more This study examines the chronology of Late Weichselian glaciation, maximum extent of Scandinavian Ice Sheet (SIS) and its glacial advance and decay dynamics in western part of the East European Plain. The study area encompasses the SE sector of the SIS between the Baltic Sea and the Last Glacial Maximum (LGM) position in the western part of the East European Plain (Fig. 1.). The Late Weichselian glaciation is most extensively studied; however chronological data are unevenly distributed and the timing of the advance of the last SIS and its arrival to maximum extent and deglaciation are continuously debated. This has necessitated the revision of the chronological data. In current study the behaviour of the SIS during the Weichselian Glaciation on East European Plain is discussed through the collection, review and synchronization of all available chronological data (14C, OSL, TL, 10Be). As two different ice streams were operating during the Late Weichselian in the western part of the E...
Radiocarbon and optically stimulated luminescence dates, together with bio- and lithostratigraphi... more Radiocarbon and optically stimulated luminescence dates, together with bio- and lithostratigraphical data, revealed an interval of ice-free conditions between 72.2 OSL and 33.8 cal 14C ka BP at the Kileshino site (Valdaj Upland, Russia), corresponding to Marine Isotope Stages (MIS) 4 and 3. Limnic sedimentation conditions occurred at the Kileshino site between 57.5 OSL and 33.8 cal 14C ka BP, corresponding to MIS 3 megainterstadial in European Russia (Oerel to Hengelo interstadials in Central Europe). During the last glaciation, a sedimentary unit of laminated silt and sand of fluvial origin was redeposited at that site due to expansion of the Scandinavian Ice Sheet (SIS). This unit expresses fluvial sedimentation conditions NW of Kileshino between 72.2 and 40.8 OSL ka. All dates together suggest that the Kileshino site was ice-free between 72.2 OSL and 33.8 cal 14C ka BP. The sedimentary unit of laminated silt and sand was redeposited at the Kileshino site during the last SIS not before 33.8 cal 14C ka BP, according to previous studies, possibly at its maximum extent between 19.1 cal 14C BP and 18 OSL ka. Only one till, younger than 72.2 ka, was found from the Kileshino outcrop. It can be concluded that the SIS reached this area only once during the last 72.2 ka in the late Valdaj (Weichselian), after 33.8 cal 14C ka BP. The expansion of the SIS to the study area between 115 and 58 ka could be neither proved nor disproved as there is no chronological information about the time between 115 and 72.2 ka.
A database consisting of radiocarbon (14C), optically stimulated luminescence (OSL), thermolumine... more A database consisting of radiocarbon (14C), optically stimulated luminescence (OSL), thermoluminescence (TL) and beryllium (10Be) dates was used for timing the advance of the Late Weichselian Scandinavian Ice Sheet (SIS), determining the age of the Last Glacial Maximum (LGM) and the rate of deglaciation. The study area encompasses the southeastern sector of the last SIS between the Baltic Sea and the LGM position in the western part of the East European Plain, covering the Karelian Ice-Stream Complex (ISC) area in the east and the Baltic ISC area in the west. The linear advance and recession rates of the last SIS were estimated to be between 110 and 330 m a−1 and between 50 and 170 m a−1, respectively. The onset of the last SIS in the Karelian ISC area reached the western shores of Latvia not before 26 OSL ka, and in the Baltic ISC area, on the southern shores of the Gulf of Finland, not before 21 OSL ka. The last SIS reached close to the LGM position earliest in NW Belarus, not earlier than 22.6 cal. 14C ka BP, and latest in the NE of Belarus, not earlier than 19.1 cal. 14C ka BP. The Baltic ISC area between the LGM position and the western shores of Latvia was deglaciated in about 8 ka, and in the Karelian ISC area, between the LGM position and the southern shores of the Gulf of Finland, in about 2.6 ka. The whole area between the LGM position and the Baltic Sea was deglaciated between 14.2 10Be ka and 13.3 cal. 14C ka BP.
Uploads
Papers by Katrin Lasberg
Kileshino between 72.2 and 40.8 OSL ka. All dates together suggest that the Kileshino site was ice-free between 72.2 OSL and 33.8 cal 14C ka BP. The sedimentary unit of laminated silt and sand was redeposited at the Kileshino site during the last SIS not before 33.8 cal 14C ka BP, according to previous studies, possibly at its maximum extent between 19.1 cal 14C BP and 18 OSL ka. Only one till, younger than 72.2 ka, was found from the Kileshino outcrop. It can be concluded that the SIS reached this area only once during the last 72.2 ka in the late Valdaj (Weichselian), after 33.8 cal 14C ka BP. The expansion of the SIS to the study area between 115 and 58 ka could be neither proved nor disproved as there is no chronological information about the time between 115 and 72.2 ka.
Ice-free interval corresponding to Marine Isotope Stages 4 and 3 at the Last Glacial Maximum position at Kileshino, Valdaj Upland, Russia. Available from: https://www.researchgate.net/publication/264992147_Ice-free_interval_corresponding_to_Marine_Isotope_Stages_4_and_3_at_the_Last_Glacial_Maximum_position_at_Kileshino_Valdaj_Upland_Russia [accessed Apr 15, 2015].
Kileshino between 72.2 and 40.8 OSL ka. All dates together suggest that the Kileshino site was ice-free between 72.2 OSL and 33.8 cal 14C ka BP. The sedimentary unit of laminated silt and sand was redeposited at the Kileshino site during the last SIS not before 33.8 cal 14C ka BP, according to previous studies, possibly at its maximum extent between 19.1 cal 14C BP and 18 OSL ka. Only one till, younger than 72.2 ka, was found from the Kileshino outcrop. It can be concluded that the SIS reached this area only once during the last 72.2 ka in the late Valdaj (Weichselian), after 33.8 cal 14C ka BP. The expansion of the SIS to the study area between 115 and 58 ka could be neither proved nor disproved as there is no chronological information about the time between 115 and 72.2 ka.
Ice-free interval corresponding to Marine Isotope Stages 4 and 3 at the Last Glacial Maximum position at Kileshino, Valdaj Upland, Russia. Available from: https://www.researchgate.net/publication/264992147_Ice-free_interval_corresponding_to_Marine_Isotope_Stages_4_and_3_at_the_Last_Glacial_Maximum_position_at_Kileshino_Valdaj_Upland_Russia [accessed Apr 15, 2015].