Potential limitations of biogenic silica as an indicator of abrupt climate change in Lake Baikal, Russia

Swann, George E.A. and Mackay, Anson W. (2006) Potential limitations of biogenic silica as an indicator of abrupt climate change in Lake Baikal, Russia. Journal of Paleolimnology, 36 (1). pp. 81-89. ISSN 0921-2728

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Abstract

Biogenic Silica (BSi) has been one of the most important proxies for determining the palaeoclimate from Lake Baikal over glacial-interglacial cycles. Concentrations (calculated through a 1% Na2CO3 wet-alkaline digestion) at a site in the north basin, however, reveal consistently low values during MIS 3 compared to greater than tenfold changes in diatom concentrations and biovolumes from c. 53.3–51.5 kyr BP. With similar glacial trends present at other low sedimentation sites, we suggest that significant amounts of BSi are removed from diatoms during glacials due to a relative increase in diatom dissolution at the sediment–water interface. This contrasts with existing results from other, higher sedimentation, sites such as those within the Selenga Delta, which display a strong relationship between diatoms and BSi. Site selection is therefore essential when searching for Heinrich and other glacial millennial-scale events in Lake Baikal, and we recommend that both BSi and diatom concentrations be calculated together in future studies.

Item Type: Article
Additional Information: The final publication is available at link.springer.com
Schools/Departments: University of Nottingham UK Campus > Faculty of Social Sciences > School of Geography
Depositing User: Swann, Dr George E A
Date Deposited: 17 Jun 2013 08:31
Last Modified: 16 May 2016 01:01
URI: http://eprints.nottingham.ac.uk/id/eprint/2008

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