NDLI: Holocene diatom stratigraphy in the Archipelago Sea, northern Baltic Sea

Content Provider	Springer Nature Link
Author	Tuovinen, Nanna Virtasalo, Joonas J. Kotilainen, Aar T.
Copyright Year	2008
Abstract	Two sediment cores from the Archipelago Sea in the northern Baltic Sea were examined for their siliceous microfossils in order to study the Holocene palaeoenvironmental history of the area. The diatom record was divided into local diatom assemblage zones (LDAZ). An age model was constructed using independent palaeomagnetic and AMS-$^{14}$C methods. The early history of the Archipelago Sea was freshwater. Initial brackish-water influence is observed at 7,950 ± 80 cal. BP (LDAZ4), but fully brackish conditions were established at 7,700 ± 80 cal. BP (LDAZ5). Diatom assemblages indicate increasing salinity, warming climate, and possible increasing trophic state during the transition from lacustrine to brackish-water conditions. The decreasing abundance of Pseudosolenia calcar-avis (Schultze) Sundström and the increasing abundance of the ice-cover indicator species Pauliella taeniata (Grunow) Round and Basson indicate reduced salinity and climatic cooling after ∼5,000 cal. BP. LDAZ boundaries do not always correlate with changes in the sediment appearance, which underlines the importance of defining biostratigraphic boundaries independently to the sediment visual character, in contrast with the conventional practice for classifying the Baltic Sea sediments.
Starting Page	793
Ending Page	807
Page Count	15
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	40
Issue Number	3
e-ISSN	15730417
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-03-14
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Diatom Stratigraphy Holocene Archipelago Sea Baltic Sea Geology Freshwater & Marine Ecology Physical Geography Climate Change Sedimentology Paleontology
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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