Havsbottnens morfologi utanför Stockholms södra skärgård

Fromm, Erik

doi:10.2307/519903

Cited by 9 publications

(3 citation statements)

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“…Marine geological investigations in the northern Baltic Sea started with the works of Giere (1938), Fromm (1943) and Martinsson (1958), among others. The Institute of Geology, Estonian Academy of Sciences began investigation of the West-Estonian Archipelago and the Gulf of Finland in 1973 (Lutt 1985).…”

Section: Previous Workmentioning

confidence: 99%

Glacial deposits and Late Weichselian ice‐sheet dynamics in the northeastern Baltic Sea

Noormets

Flodén

2002

Boreas

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Glacial deposits and landforms, interprete d from the continuous seismic re ection data, have been used to reconstruc t the Late Weichselia n ice-shee t dynamics and the sedimentar y environment s in the northeaster n Baltic Sea. The bedrock geology and topography played an important role in the glacial dynamics and subglacia l meltwater drainage in the area. Drumlins suggest a south-southeasterl y ow direction of the last ice sheet on the Ordovician Plateau. Eskers demonstrat e that subglacia l meltwater ow was focused mostly within bedrock valleys. The eskers have locally been overlain by a thin layer of till. Thick proximal outwash deposits occupy elongate d depression s in the substratum , which often occur along the sides of esker ridges. Ice-margina l grounding-lin e deposit in the southern part of the area has a continuatio n on the adjacent Island of Saaremaa. Therefore, we assume that its formation took place during Palivere Stadial of the last deglaciation , whereas the moraine bank extendin g southwestwar d from the Sõrve Peninsula is tentativel y correlated with the Pandivere Stadial. The wedge-shape d ice-margina l grounding-lin e deposit was locally fed by subglacia l meltwater streams during a standstill or slight readvance of the ice margin. The thicknes s of the glacier at the groundingline was estimated to reach approximatel y 180 m. In the western part of the area, terrace-like morpholog y of the ice-margina l deposit and series of small retreat moraines 10-20 km north of it suggest stepwise retreat of the ice margin. Therefore, a rather thin and mobile ice stream was probably covering the northeaster n Baltic Sea during the last deglaciation . Riko Noormets

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Section: Previous Workmentioning

confidence: 99%

Glacial deposits and Late Weichselian ice‐sheet dynamics in the northeastern Baltic Sea

Noormets

Flodén

2002

Boreas

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“…Several escarpments have been distinguished and investigated in the 20th century: Vendian (Nilsson, 1913;Amantov et al, 1988), Cambrian (Martinsson, 1958;Amantov et al, 1988), Ordovician (Tammekann, 1940;Kiinnapuu, 1959;Miidel, 1992), Silurian (Jaanusson, 1947;Aaloe, 1958,;Aaloe & Miidel, 1967), and Devonian (Мейронс е{ а!, 1974; Страуме, 1979). The Sub-Cambrian peneplain was described by Giere (1938) andFromm (1943).…”

Section: History Of Researchmentioning

confidence: 99%

Zonation of the Bedrock Topography of Estonia and Northern Latvia

Tavast¹

1994

Proceedings of the Estonian Academy of Sciences. Geology

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“…The limited data from the Baltic Sea have until recently hindered investigation of the glacial deposits and landforms under the sea. Therefore, the suggested ice recession lines across the Baltic Sea (Fromm 1943;Ignatius & Niemistö 1971;Ignatius et al 1981) have mostly been based on extrapolations from adjacent land areas and bathymetry.…”

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confidence: 99%

Glacial deposits and ice‐sheet dynamics in the north‐central Baltic Sea during the last deglaciation

Noormets

Flodén

2002

Boreas

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Nine seismic stratigraphic units were distinguished, and their distribution mapped, in an 80 × 130 km submeridionally oriented area in the north‐central Baltic Sea, east of Gotska Sandön and Farö. Analysis of these units revealed a great influence of the bedrock topography on the structure and distribution of the glacial deposits. Major glacially eroded valleys in the Baltic Clint, connecting the Faro Deep and the North Central Baltic Basin (Harff & Winterhalter 1996) across a narrow sill, form an extensive submeridional bedrock depression. The concentration of ice flow into this depression is reflected in the drumlinized surface of the till near the Baltic Clint. Large eskers in the elongated bedrock depressions and on the Ordovician Plateau mark the locations of former subglacial meltwater conduits. Termination of the eskers with extensive glacio fluvial outwash fans at the northern limit of the Farö Deep, the presence of subaquatic melt‐out till in the bottom of it, and wedge‐shaped ice‐marginal grounding‐line deposit on the Silurian Plateau suggest floating ice margin conditions in the low‐lying areas and a local ice shelf confined to the Frö Deep during the deglaciation.

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Havsbottnens morfologi utanför Stockholms södra skärgård

Cited by 9 publications

References 0 publications

Glacial deposits and Late Weichselian ice‐sheet dynamics in the northeastern Baltic Sea

Glacial deposits and Late Weichselian ice‐sheet dynamics in the northeastern Baltic Sea

Zonation of the Bedrock Topography of Estonia and Northern Latvia

Glacial deposits and ice‐sheet dynamics in the north‐central Baltic Sea during the last deglaciation

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