Universität zu Köln

Andreev, Andrei A., Shumilovskikh, Lyudmila S., Savelieva, Larisa A., Gromig, Raphael ORCID: 0000-0001-9217-4259, Fedorov, Grigory B., Ludikova, Anna, Wagner, Bernd ORCID: 0000-0002-1369-7893, Wennrich, Volker ORCID: 0000-0003-3617-1963, Brill, Dominik ORCID: 0000-0001-8637-4641 and Melles, Martin (2019). Environmental conditions in northwestern Russia during MIS 5 inferred from the pollen stratigraphy in a sediment core from Lake Ladoga. Boreas, 48 (2). S. 377 - 387. HOBOKEN: WILEY. ISSN 1502-3885

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Abstract

Lake Ladoga hosts preglacial sediments, although the Eurasian ice sheet overrode the area during the LGM. These sediments were first discovered by a seismic survey and are investigated using a 22.75-m-long core. Its upper 13.30m comprise Holocene and Lateglacial sediments separated from the lower 11.45m of preglacial sediments by a hiatus. They consist of highly terrigenous lacustrine sediments, which according to OSL dating, were deposited during an early stage of the last ice age (MIS 5). The palynological data allow a first reconstruction of the Early Weichselian environmental history for northwestern Russia. Birch and alder forests with broad-leaved taxa dominated during MIS 5d (c.118-113 ka), suggesting a climate more favourable than in the Holocene. A high content of well-sorted sands and poorly preserved palynomorphs indicates a shallow-water environment at least temporarily. More fine-grained sediments and better preserved organic remains suggest deeper water environments at the core location during MIS 5c (c.113-88 ka). Pine and spruce became dominant, while broad-leaved taxa started to disappear, especially after c.90 ka, pointing to a gradual climate cooling. An increase in open herb-dominated habitats at the beginning of MIS 5b (c.88-86 ka) reflects a colder and dryer climate. However, later (c.86-82 ka) pine and spruce again became more common. Birch and alder forests dominated in the area c.82-80 ka (beginning of MIS 5a). Although open treeless habitats also became more common at this time, a slight increase in hazel may point to somewhat warmer climate conditions coinciding with the beginning of MIS 5a. The studied sediments also contain numerous remains of freshwater algae and cysts of marine and brackish-water dinoflagellates and acritarchs documenting that the present lake basin was part of a brackish-water basin during the Early Weichselian, probably as a gulf of the Pre-Baltic Sea.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Andreev, Andrei A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Shumilovskikh, Lyudmila S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Savelieva, Larisa A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gromig, Raphael UNSPECIFIED orcid.org/0000-0001-9217-4259 UNSPECIFIED Fedorov, Grigory B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ludikova, Anna UNSPECIFIED UNSPECIFIED UNSPECIFIED Wagner, Bernd UNSPECIFIED orcid.org/0000-0002-1369-7893 UNSPECIFIED Wennrich, Volker UNSPECIFIED orcid.org/0000-0003-3617-1963 UNSPECIFIED Brill, Dominik UNSPECIFIED orcid.org/0000-0001-8637-4641 UNSPECIFIED Melles, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-152159
DOI:	10.1111/bor.12382
Journal or Publication Title:	Boreas
Volume:	48
Number:	2
Page Range:	S. 377 - 387
Date:	2019
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1502-3885
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Geosciences > Institute of Geology and Mineralog
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INTERGLACIAL-GLACIAL CYCLE; BALTIC SEA; CLIMATE; SHIFTS Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15215