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- Title
Reconstruction of Late Holocene development of the submarine terrace in the Eastern Gulf of Finland.
- Authors
Leontyev, Igor; Ryabchuk, Daria; Zhamoida, Vladimir; Spiridonov, Mikhail; Kurennoy, Dmitry
- Abstract
The coastal slope morphology of the submarine coastal zone of the Eastern Gulf of Finland was identified during a VSEGEI survey involving side-scan sonar profiling, echo sounding, surface sediment sampling. Along the northern coast of the Gulf, the sand terrace sub-surface was mapped at depths of 4-5 m to 8-12 m, top to foot. In order to explain the morphogenesis of the terrace, the development of the coast over the Late Holocene was reconstructed using a mathematical model. Tectonic processes, particularly glacio-isostasy, are suggested to have been the main factors forming the terrace at earlier stages; at later stages sea level changes played the main role. The coastal development during the Late Holocene was subjected to the gradual erosion of the above-water terraces and the formation of underwater terraces. During transgression phases, the rate of coastal recession reached 0.5 m y-1, while at other times it was approximately half that. The submarine terrace, developed 3.2-1.2 kyr ago, broadened as a result of both coastal recession and sediment accumulation on its outer edge. During this time, the coast retreated about 500 m.
- Subjects
FINLAND; COASTS; HOLOCENE stratigraphic geology; TERRACING; SLOPES (Physical geography)
- Publication
Baltica, 2010, Vol 23, Issue 2, p101
- ISSN
0067-3064
- Publication type
Article