scholarly journals Mollusc assemblages from Subatlantic oxbow lake deposits in the Szreniawa River valley near Słomniki (Miechów Upland, southern Poland)

2018 ◽  
Vol 26 (4) ◽  
pp. 249-262 ◽  
Author(s):  
Witold Paweł Alexandrowicz
Keyword(s):  
River Valley ◽  
Oxbow Lake ◽  
Southern Poland ◽  
Mollusc Assemblages ◽  
Lake Deposits

scholarly journals Timescale for Climatic Events of Subboreal/Subatlantic Transition Recorded at the Valakupiai Site, Lithuania

Radiocarbon ◽  
2007 ◽  
Vol 49 (2) ◽  
pp. 889-897 ◽  
Author(s):  
Jacek Pawlyta ◽  
Algirdas Gaigalas ◽  
Adam Michczyński ◽  
Anna Pazdur ◽  
Aleksander Sanko
Keyword(s):  
Human Activity ◽  
Black Sea ◽  
Radiocarbon Dating ◽  
Basal Part ◽  
Oxbow Lake ◽  
The Black Sea ◽  
Mollusk Fauna ◽  
The Baltic ◽  
Lake Deposits

Oxbow lake deposits of the Neris River at the Valakupiai site in Vilnius (Lithuania) have been studied by different methods including radiocarbon dating. A timescale was attained for the development of the oxbow lake and climatic events recorded in the sediments. 14C dates obtained for 24 samples cover the range 990–6500 BP (AD 580 to 5600 BC). Medieval human activity was found in the upper part of the sediments. Mollusk fauna found in the basal part of the terrace indicate contact between people living in the Baltic and the Black Sea basins. Mean rates were calculated for erosion of the river and for accumulation during the formation of the first terrace.

scholarly journals A Gas-Emission Crater in the Erkuta River Valley, Yamal Peninsula: Characteristics and Potential Formation Model

Geosciences ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 170 ◽  
Author(s):  
Evgeny Chuvilin ◽  
Julia Stanilovskaya ◽  
Aleksey Titovsky ◽  
Anton Sinitsky ◽  
Natalia Sokolova ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
River Valley ◽  
Oxbow Lake ◽  
Yamal Peninsula ◽  
Permafrost Soil ◽  
Formation Model ◽  
Gas Emission ◽  
Ground Ice ◽  
Lake Formation ◽  
Potential Formation

Methane is a powerful greenhouse gas, and the abrupt degassing events that recently have formed large craters on the Russian Arctic Yamal and Gydan Peninsulas have caused major concern. Here we present field data on cover sediments and evolution of a gas-emission crater discovered in the Erkuta–Yakha River valley in the southern Yamal Peninsula in June 2017. The crater is located south of other similar craters discovered over the past decade in northern West Siberia. Data were collected during a field trip to the Erkuta crater in December 2017 which included field observations and sampling of permafrost soil and ground ice from the rim of the crater. All soil and ice samples were measured for contents of methane and its homologs (ethane and propane) and carbon dioxide. The contents of carbon dioxide in some samples are notably higher than methane. The strongly negative δ13С of methane from ground ice samples (−72‰) is typical of biogenic hydrocarbons. The ratio of methane to the total amount of its homologs indicate a component of gases that have migrated from a deeper, thermogenic source. Based on obtained results, a potential formation model for Erkuta gas-emission crater is proposed, which considers the combined effect of deep-seated (deep gas migration) and shallow (oxbow lake evolution and closed talik freezing) causes. This model includes several stages from geological prerequisites to the lake formation.

Lost in dating – Problems with the absolute chronologies and sedimentation rates of Late Glacial and Early Holocene oxbow lake deposits in Central Europe

2017 ◽  
Vol 41 ◽  
pp. 187-201 ◽  
Author(s):  
Piotr Kołaczek ◽  
Mariusz Gałka ◽  
Karina Apolinarska ◽  
Piotr Gębica ◽  
Sławomir Superson ◽  
...  
Keyword(s):  
Central Europe ◽  
Late Glacial ◽  
Early Holocene ◽  
Oxbow Lake ◽  
Sedimentation Rates ◽  
The Absolute ◽  
Lake Deposits

scholarly journals Evolution of the Bystrzyca River valley during Middle Pleistocene Interglacial (Sudetic Foreland, south-western Poland)

2020 ◽  
Vol 12 (1) ◽  
pp. 1679-1703
Author(s):  
Dariusz Krzyszkowski ◽  
Lucyna Wachecka-Kotkowska ◽  
Marcin Krawczyk
Keyword(s):  
Distal Part ◽  
System Development ◽  
River System ◽  
River Valley ◽  
Oxbow Lake ◽  
Middle Pleistocene ◽  
Alluvial Deposits ◽  
The North ◽  
Study Results ◽  
Tectonic Movements

AbstractThe article depicts the problem of river system development during the Middle Pleistocene Interglacial in the Bystrzyca River Valley (Sudetic Foreland, south-western Poland). Ten research sites located within the Świdnica Plain are presented, in which the structural, grain size (granulometry), petrographic, quartz grain morphoscopy, and heavy mineral analyses were carried out. The study results show the formation of piedmont fan deposits 2–8 km to the NE of the Sudetic Marginal Fault. The location of the fluvial deposits between the Sanian and Odranian tills indicates that they were deposited during the Holsteinian Interglacial (Krzczonów Formation, Mazovian; see Table 1). According toxthe lithofacies analysis, vast alluvial plains, composed of angular gravel grains in the south and of sands in the north, were deposited in the Sudetic Foreland in the environment of a very dynamic river. They are covered with a discontinuous layer of Odranian till. The petrographic spectrum shows 90–99% of local rocks, namely, Sudetic porphyry, Sowie Mts Gneiss and milky quartz, and 1–10% of Scandinavian rocks. In the proto-Bystrzyca river system, the existence of an oxbow lake in the distal part of the Krzczonów fan has been proved, which was developing at the end of the Holsteinian Interglacial. The continuity of the alluvial deposits is interrupted in the vicinity of Świdnica due to both the tectonic movements and the formation of the narrow tectonic graben of Roztoka–Mokrzeszów.

GLACIALLY DAMMED LAKE DEPOSITS IN THE TANGTSE RIVER VALLEY, LADAKH, INDIA

2019 ◽  
Author(s):  
Nicholas J. Van Buer ◽  
◽  
James Pershken ◽  
James Pershken
Keyword(s):  
River Valley ◽  
Dammed Lake ◽  
Lake Deposits
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