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Helena Filipsson, foto Erik Thor

Helena Filipsson

Professor

Helena Filipsson, foto Erik Thor

MIS 3 marine and lacustrine sediments at Kriegers Flak, southwestern Baltic Sea

Författare

  • Johanna Anjar
  • Nicolaj Krog Larsen
  • Svante Björck
  • Lena Adrielsson
  • Helena Filipsson

Summary, in English

Sediment cores from the Kriegers Flak area in the southwestern Baltic Sea show a distinct lithological succession, starting with a lower diamict that is overlain by a c. 10 m thick clay unit that contains peat, gyttja and other organic remains. On top follows an upper diamict that is inter-layered with sorted sediments and overlain by an upward-coarsening sequence with molluscs. In this paper we focus on the clay unit, which has been subdivided into three subunits: (A) lower clay with benthic foraminifera and with diamict beds in the lower part; (B) thin beds of gyttja and peat, which have been radiocarbon-dated to 31-35 14C kyr BP (c. 36-41 cal. kyr BP); and (C) upper clay unit. Based on the preliminary results we suggest the following depositional model: fine-grained sediments interbedded with diamict in the lower part (subunit A) were deposited in a brackish basin during a retreat of the Scandinavian Ice Sheet, probably during the Middle Weichselian. Around 40 kyr BP the area turned into a wetland with small ponds (subunit B). A transgression, possibly caused by the damming of the Baltic Basin during the Kattegat advance at 29 kyr BP, led to the deposition of massive clay (subunit C). The data presented here provide new information about the paleoenvironmental changes occurring in the Baltic Basin following the Middle Weichselian glaciation.

Avdelning/ar

  • Kvartärgeologi
  • MERGE: ModElling the Regional and Global Earth system

Publiceringsår

2010

Språk

Engelska

Sidor

360-366

Publikation/Tidskrift/Serie

Boreas

Volym

39

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

John Wiley and Sons

Ämne

  • Geology

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1502-3885