A diatom record of centennial resolution for the Kazantsevo Interglacial stage in Lake Baikal (Siberia)

• Main Authors: Rioual, P, Mackay, AW
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: ELSEVIER SCIENCE BV 2005
• Subjects: Lake Baikal; Last Interglacial; Kazantsevo; diatom biovolume accumulation rate; CONTINENTAL CLIMATE RESPONSE; NORTH-ATLANTIC OCEAN; 983 GARDAR DRIFT; GEOMAGNETIC PALEOINTENSITY; ENVIRONMENTAL-CHANGE; ROCK MAGNETISM; CENTRAL-EUROPE; SEDIMENTS; SUCCESSION; INSOLATION; North Atlantic; Siberia
• Online Access: http://discovery.ucl.ac.uk/67132/

Diatom analysis of a sediment core from the Northern basin of Lake Baikal (Siberia) has been carried out with focus on the Kazantsevo Interglacial period (equivalent to the Eemian in Europe). The age model, based on palaeomagnetism, indicates that this stage lasted about 11,000 years in the region of Lake Baikal, from ca. 128 to 117 ky BP. Diatom data (sampling resolution of 1-cm interval, ca. 130 years), including both relative percentage and biovolume accumulation rate (BVAR) data, are used to infer past limnological conditions and the climatic factors that drove them. Our record reveals that peak interglacial conditions, characterized by highest diatom production, occurred between similar to 124 and 120 ky BP. During that period, the diatom record suggests stable, warm and moist conditions. This climatic optimum is then interrupted by a low amplitude cold event at similar to 120 ky BP. The last part of the interglacial in Lake Baikal, between similar to 120 and similar to 117 ky BP, is marked by colder and probably drier climate. Low-resolution diatom analysis spanning the Kazantsevo was also carried out on another core taken further south at Academician Ridge. Diatom successions at the two sites investigated were remarkably similar suggesting that our sedimentary records are complete and representative for at least a large part of Lake Baikal. (C) 2004 Elsevier B.V. All rights reserved.