Pietų Lietuvos paleogeografija vėlyvojo pleistoceno Nemuno (Weichselian)apledėjimo metu
The recurring permafrost and cryogenic structures in the soils were an important phenomenon in the periglacial zone in the southeastern part of Lithuania. During the permafrost degradation an intensive transformation of the slopes took place, influencing the development of loess cover formations. Th...
| Main Authors: | , , |
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| Format: | Article in Journal/Newspaper |
| Language: | Lithuanian English |
| Published: |
2004
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| Subjects: | |
| Online Access: | http://lsmu.lvb.lt/LSMU:ELABAPDB5416713&prefLang=en_US |
| Summary: | The recurring permafrost and cryogenic structures in the soils were an important phenomenon in the periglacial zone in the southeastern part of Lithuania. During the permafrost degradation an intensive transformation of the slopes took place, influencing the development of loess cover formations. The 3-4 lithocomplexes identified in the system of these formations correlate with the Weichselian biostrati-graphic elements in Lithuania and Central Europe. The specific character of the Late Weichselian Baltic deglaciation was predetermined by a wide (30-40 km) dead ice elevation and the Simnas-Balbieriškis-Stakliškės glaciolacustrine basin between it and the younger South Lithuanian glacier. The excess water of this basin washed out a great part of the middle Nemunas valley in the southern direction. The middle part of the territory, extending from southwest to northeast (by most researchers regarded as part of Vilnius-Warsaw-Berlin Urstromtal), in the Weichselian of the Late Pleistocene was subject to an intensive interstadial erosion and accumulation, glacier exaration and sedimentation, and subsequent accumulation in glaciofluvial sandurs and cascade glaciolacustrine basins. Repeated glaciofluvial (alluvial) erosion and accumulation took place in the Urstromtal zone in late glaciation, leaving many terraces over the flood plains of the Middle Nemunas and the Lower Merkys. |
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