Johanna Anjar (e-mail: Johanna.Anjar@geol.lu.se), Nicolaj Krog Larsen, Svante Björck, Lena Adrielsson and Helena L. Filipsson, GeoBiosphere Science Centre, Department of Geology, Quaternary Sciences, Sölvegatan 12, SE-223 62 Lund, Sweden
MIS 3 marine and lacustrine sediments at Kriegers Flak, southwestern Baltic Sea
Article first published online: 11 FEB 2010
© 2010 The Authors. Journal compilation © 2010 The Boreas Collegium
Volume 39, Issue 2, pages 360–366, April 2010
How to Cite
ANJAR, J., LARSEN, N. K., BJÖRCK, S., ADRIELSSON, L. and FILIPSSON, H. L. (2010), MIS 3 marine and lacustrine sediments at Kriegers Flak, southwestern Baltic Sea. Boreas, 39: 360–366. doi: 10.1111/j.1502-3885.2010.00139.x
- Issue published online: 25 FEB 2010
- Article first published online: 11 FEB 2010
- received 8th January 2009, accepted 3rd December 2009
Anjar, J., Larsen, N. K., Björck, S., Adrielsson, L. & Filipsson, H. L. 2010: MIS 3 marine and lacustrine sediments at Kriegers Flak, southwestern Baltic Sea. Boreas, 10.1111/j.1502-3885.2010.00139.x. ISSN 0300-9483.
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.