The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Björn E Berglund

Björn Berglund

Professor emeritus

Björn E Berglund

New insights on the Yoldia Sea low stand in the Blekinge archipelago, southern Baltic Sea

Author

  • Thomas Andrén
  • Elinor Andrén
  • Björn Berglund
  • Shi-Young Yu

Summary, in English

Abstract in Undetermined
One sediment core from the Jarnavik bay in Blekinge archipelago has been investigated for its content of pollen and diatoms and its chemical properties. Two levels were also dated by radiocarbon. Based on the results the sediment sequence analysed has been divided into three environmental units largely corresponding to the lithology of the sequence. A lowermost unit consisting of weakly varved and homogeneous clay was deposited during the end of the brackish phase of the Yoldia Sea at a moderate water depth. On top of this unit a gyttja-clay unit was deposited. The onset of the deposition of this unit has been dated to c. 11 100 cal. yrs. BP. An increasing organic production and increased terrestrial influence is recorded in the chemical data and a very shallow water depth is indicated in the pollen and diatom flora. These results point to conditions in a bay probably isolated from the Yoldia Sea. A local tentative shore displacement curve have been constructed and it is proposed that this unit represents the low stand at c. -18 m during the Yoldia Sea stage in this part of the Baltic Sea basin. The uppermost unit consists of homogeneous clay with a low content of organic carbon. An increasing water depth is indicated by the composition of both pollen and diatoms. The diatom flora also displays an increase in freshwater species. This environmental change was probably the result of a transgression in the beginning of the Ancylus Lake stage.

Department/s

  • Quaternary Sciences

Publishing year

2007

Language

English

Pages

277-285

Publication/Series

GFF

Volume

129

Document type

Journal article

Publisher

Taylor & Francis

Topic

  • Geology

Keywords

  • Baltic Sea
  • Blekinge archipelago
  • pollen
  • diatoms
  • submarine pine stumps
  • Yoldia Sea
  • Yoldia regression
  • Ancylus Lake
  • Ancylus transgression
  • local Blekinge shore displacement curve

Status

Published

ISBN/ISSN/Other

  • ISSN: 2000-0863