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GEOCHEMICAL INDICATORS OF CLIMATE CHANGE IN THE ANNUAL LAYERS OF BOTTOM SEDIMENT LAKE SHIRA (SOUTH SIBERIA)
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GEOCHEMICAL INDICATORS OF CLIMATE CHANGE IN THE ANNUAL LAYERS OF BOTTOM SEDIMENT LAKE SHIRA (SOUTH SIBERIA)
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Conference Proceeding
GEOCHEMICAL INDICATORS OF CLIMATE CHANGE IN THE ANNUAL LAYERS OF BOTTOM SEDIMENT LAKE SHIRA (SOUTH SIBERIA)
2013
Overview
A sediment column of 155 cm in length was retrieved by hammer corer in the deepest central part of lake Shira. Solid samples were prepared from the wet cores by freeze drying and impregnating with epoxy resin. The inter annual and inter seasonal variations in the trace element composition of annual layers are studied by means of X-ray scanning microanalysis with synchrotron radiation on the VEPP-3 and BESSY-II storage rings. Detailed experimental investigations of the internal structure of annual layers allowed the authors to create a lithological-geochemical model of sedimentation in Lake Shira, and to find climatically correlated minor elements. This model of the annual cycle of sedimentation was used to explain the periodic white layers with high Sr contents in the core. Thick 3 cm-5 cm light carbonate Sr-enriched intervals correspond to an extremely low level of the lake and are repeated every 450-550 years.
Publisher
Surveying Geology & Mining Ecology Management (SGEM)
Subject
