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A reassessment of late glacial - Holocene diatom oxygen isotope record from Lake Baikal using a geochemical mass-balance approach

Mackay, AW; Swann, GEA; Brewer, TS; Leng, MJ; Morley, DW; Piotrowska, N; Rioual, P; (2011) A reassessment of late glacial - Holocene diatom oxygen isotope record from Lake Baikal using a geochemical mass-balance approach. Journal of Quaternary Science , 26 (6) 627 - 634. 10.1002/jqs.1484. Green open access

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Abstract

We present a new palaeoenvironmental record of hydrological variability in Lake Baikal, based on re-modelled delta O-18(diatom) values of diatom silica (delta O-18(modelled)), where the residual contaminants are identified and compensated for using electron optical imaging and whole-sample geochemistry. delta O-18(modelled) interpretations are based on the balance between rivers with high delta O-18 values and rivers with low delta O-18 values. Isotopic variability is related to latitudinal differences in precipitation which feed these rivers. The delta O-18(modelled) record suggests that rather moist conditions prevailed in the Lake Baikal region during the latter stages of the Younger Dryas. Throughout the Holocene, episodes of low delta O-18(modelled) values are, in general, in good agreement with increases in percentage haematite-stained grains in North Atlantic sediments (indicative of ice-rafted debris events). Rivers with southerly catchments dominate fluvial input especially between c. 3.3 and 2 cal ka BP, concurrent with high precipitation in the Lake Baikal region. Copyright (C) 2011 John Wiley & Sons, Ltd.

Type: Article
Title: A reassessment of late glacial - Holocene diatom oxygen isotope record from Lake Baikal using a geochemical mass-balance approach
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/jqs.1484
Publisher version: http://dx.doi.org/10.1002/jqs.1484
Language: English
Additional information: The definitive version is available at www3.interscience.wiley.com
Keywords: delta O-18(diatom), Holocene, IRD events, Lake Baikal, late glacial, CLIMATE VARIABILITY, ENVIRONMENTAL-CHANGE, BIOGENIC SILICA, POLLEN RECORDS, CENTRAL-ASIA, SEDIMENTS, MONGOLIA, PALEOCLIMATE, SIBERIA, BASIN
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Geography
URI: https://discovery.ucl.ac.uk/id/eprint/1323116
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