New luminescence ages reveal Early to Middle Weichselian deposits in central Latvia

• Autorzy: Lamsters K. , Kalińska-Nartiša E. , Zelčs V. , Alexanderson H.

Identyfikatory

DOI

10.7306/gq.1349

• Języki publikacji: EN

Abstrakty

EN

New optically stimulated luminescence (OSL) ages show that sandy deposits overlain by Late Weichselian subglacial till in central Latvia are of Early to Middle Weichselian age. The finer chronological resolution of unconsolidated sediment deposition in the Central Latvian Lowland (CLL) remains relatively unstudied, and here we provide a first characterisation of the deposits with respect to their age. Three OSL ages ranging between 84 ± 9 ka and 112 ± 11 ka suggest that the deposits studied in the CLL are of Early Weichselian age (MIS 5). We found no Middle Weichselian deposits in the CLL, and assume that any such younger sediments might have been eroded during the advance of the Zemgale Lobe in the Late Weichselian. One site, in the ice-marginal zone adjacent to the interlobate area, has nevertheless deposits dated to 44 ± 10 ka corresponding to the Middle Weichselian (MIS 3). Our results are compatible with existing ESR ages on three sets of Portlandia arctica shells from the central part of the lowland; the shells had been incorporated into glacial deposits during later glacial advances. Finally, our findings largely support ice-free conditions during the Early and Middle Weichselian in the middle and southern part of central Latvia.

Słowa kluczowe

EN

optically stimulated luminescence (OSL) dating; subglacial bedforms; Early Weichselian; Middle Weichselian; central Latvia

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2017
• Tom: Vol. 61, No. 2
• Strony: 480--490
• Opis fizyczny: Bibliogr. 85 poz., rys., tab., wykr.

Twórcy

autor

Lamsters K.

• University of Latvia, Faculty of Geography and Earth Sciences, Jelgavas Street 1, LV-1004, Riga, Latvia

autor

Kalińska-Nartiša E.

• Lund University, Department of Geology, Sölvegatan 12, 223 62 Lund, Sweden

autor

Zelčs V.

• University of Latvia, Faculty of Geography and Earth Sciences, Jelgavas Street 1, LV-1004, Riga, Latvia

autor

Alexanderson H.

• Lund University, Department of Geology, Sölvegatan 12, 223 62 Lund, Sweden

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).