The Ancylus and Litorina transgressions of the Baltic in southwest Finland

Glückert, G.

doi:10.1016/1040-6182(91)90060-2

Cited by 12 publications

(14 citation statements)

References 7 publications

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“…before. It is consistent with earlier observations by Ristaniemi & Glückert (1988) and Glückert (1991), who have argued that the Litorina transgression reached 42 m a.s.l. (Bastukärr basin) in the 2nd Salpausselkä zone in southwestern Finland (Eronen et al 1993).…”

Section: Reconstruction and Interpretation Of The Shoreline Displacemsupporting

confidence: 93%

Rates of Holocene isostatic uplift and relative sea‐level lowering of the Baltic in SW Finland based on studies of isolation contacts

Eronen¹,

Glückert

Hatakka³

et al. 2001

Boreas

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Southwestern Finland was covered by the Weichselian ice sheet and experienced rapid glacio‐isostati c rebound after early Holocene deglaciation. The present mean overall apparent uplift rate is of the order of 4–5 mm/yr, but immediately after deglaciation the rate of crustal rebound was several times higher. Concurrently with land uplift, relative sea level in the Baltic basin during the past more than 8000 years was also strongly affected by the eustatic changes in sea level. There is ample evidence from earlier studies that during the early Litorina Sea stage on the southeastern coast of Finland around 7000 yr BP (7800 cal. yr BP), the rise in sea level exceeded the rate of land uplift, resulting in a short‐lived transgression. Because of a higher rate of uplift, the transgression was even more short‐lived or of negligible magnitude in the southwestern part of coastal Finland, but even in this latter case a slowing down in the rate of regression can still be detected. We used evidence from isolation basins to obtain a set of 71 14C dates, and over 30 new sea‐level index points. The age‐elevation data, obtained from lakes in two different areas and located between c. 64 m and 1.5 m above present sea level, display a high degree of internal consistency. This suggests that the dates are reliable, even though most of them were based on bulk sediment samples. The two relative sea‐level curves confirm the established model of relatively gradually decreasing rates of relative sea‐level lowering since c. 6100 yr BP (7000 cal. yr BP) and clearly indicate that the more northerly of the two study areas experienced the higher rate of glacio‐isostati c recovery. In the southerly study area, changes in diatom assemblages and lithostratigraphy suggest that during the early Litorina Sea stage (8300–7600 cal. yr BP) eustatic sea‐level rise exceeded land uplift for hundreds of years. Evidence for this transgressio n was discovered in a lake with a basin threshold at an elevation of 41 m above sea level, which is markedly higher than any previously known site with evidence for the Litorina transgression in Finland. We also discuss evidence for subsequent short‐term fluctuations superimposed on the main trends of relative sea‐level changes.

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Section: Reconstruction and Interpretation Of The Shoreline Displacemsupporting

confidence: 93%

Rates of Holocene isostatic uplift and relative sea‐level lowering of the Baltic in SW Finland based on studies of isolation contacts

Eronen¹,

Glückert

Hatakka³

et al. 2001

Boreas

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“…The reference line trends N45°W. Glückert 1991;Björck et al 2001). The deglaciation of southeastern Å ngermanland appears to have taken place at the time of the transgression (Fig.…”

Section: Outline Of the Curve Comparisons Interpretations And Implimentioning

confidence: 93%

Holocene shore displacement and chronology in Ångermanland, eastern Sweden, the Scandinavian glacio-isostatic uplift centre

Berglund¹

2004

Boreas

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“…The site references: 1a, 1b, 1c (Eronen 1974); 2, 8 (Donner & Eronen 1981); 3 (Haila 1987); 4 (Haila et al 1991); 5 (Matiskainen 1989b); 6, 7 (Matiskainen 1989a); 9 (Eronen 1979, unpubl. ); 10 (Hyvärinen 1979); 11 (Jungner & Sonninen 1983); 12 (Sarmaja-Korjonen 1992); 13 (Seppä & Tikkanen 1998);14, 15, 16 (this paper (Hyvärinen 1980;Glückert 1991;Eronen et al 1995). In Fig.…”

Section: Discussionmentioning

confidence: 93%

“…In the Helsinki area there are many observations of the raised Litorina shore formations at the altitude of c. 30-34 m a.s.l. (Hyyppä 1937;Sauramo 1958) and the lake-sedimentological evidence suggest either a standstill (Hyvärinen 1980(Hyvärinen , 1982 or a slight transgression of the sea level (Alhonen et al 1978;Glückert 1991;Korhola 1995). Unambiguous lake-sedimentological evidence for the transgressive nature of the Litorina Sea comes from the coast east of Helsinki where the land uplift rate is slower (Eronen 1974;Miettinen & Hyvärinen 1997).…”

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confidence: 99%

Late-Holocene shore displacement of the Finnish south coast: diatom, litho- and chemostratigraphic evidence from three isolation basins

Seppä¹

2000

SBOR

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Late-Holocene shore displacement of the Finnish south coast: diatom, litho-and chemostratigraphic evidence from three isolation basins HEIKKI SEPPÄ , MATTI TIKKANEN AND PETRI SHEMEIKKA Seppä, H., Tikkanen, M. & Shemeikka, P. 2000 (September): Late-Holocene shore displacement of the Finnish south coast: diatom, litho-and chemostratigraphic evidence from three isolation basins. Boreas, Vol. 29, pp. 219-231. Oslo. ISSN 0300-9483.Lake isolation studies provide the most reliable method for reconstructing the shore displacement history of the areas affected by postglacial isostatic land uplift. Due to the slow uplift rate and the presence of numerous lakes, the Finnish south coast is one of the key areas for investigating the Litorina transgression and subsequent shore displacement history of the Baltic. To reconstruct the relative sea-level dynamics during the late Holocene, three small lakes from the critical altitudes were analysed concerning their diatom, sulphate-sulphur, and sodium stratigraphies and loss-on-ignition values. Comparisons of the records indicate that the availability of nutrients significantly influenced the diatom-floristic patterns during the lake isolation. In particular, the mass occurrence of Fragilaria spp. seems to be associated with high values of sulphate-sulphur and sodium during and after isolation. On the basis of the new and old data, a shore displacement curve for the 30 m Litorina isobase is compiled. This indicates that since the clear Litorina transgression at 7500-6500 14 C BP, no transgressions have taken place but that the shore displacement in the area has been a stable process. The occurrence of a number of raised shore formations between the altitude of the major Litorina shore and the present sea level in south Finland can be attributed to the erosion of soft soil layers by the high-energy wave action on the exposed shore sections.

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The Ancylus and Litorina transgressions of the Baltic in southwest Finland

Cited by 12 publications

References 7 publications

Rates of Holocene isostatic uplift and relative sea‐level lowering of the Baltic in SW Finland based on studies of isolation contacts

Rates of Holocene isostatic uplift and relative sea‐level lowering of the Baltic in SW Finland based on studies of isolation contacts

Holocene shore displacement and chronology in Ångermanland, eastern Sweden, the Scandinavian glacio-isostatic uplift centre

Late-Holocene shore displacement of the Finnish south coast: diatom, litho- and chemostratigraphic evidence from three isolation basins

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