Zeroing of the TL signal in sediment undergoing fluvioglacial transport. An example from Austerdalen, Western Norway |
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| Authors: | AMD Gemmell |
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| Abstract: | Theoretical considerations imply that the suitability of glacially-deposited sediments for thermoluminescence (TL) dating will be influenced by transport routes within the ice, and by facies of deposition. Measurments on sediments obtained from the Austerdalsbreen glacier in western Norway indicate that zeroing of sediment does not occur at the base of a valley glacier, but that englacial and supraglacial sediments showed evidence of bleaching but not total zeroing. Analysis of sediments from recent glacial and fluvioglacial landforms showed no evidence that they had been zeroed prior to deposition. Results indicate that the TL-age of glacial landforms will be a function of the derivation and travel paths of the sediments of which it is composed rather than of the form itself. It is concluded that as knowledge of the rates of bleaching associated with various facies of transport and deposition of glacial sediments improves, so the potential of the technique to act as a diagnostic sedimentological tool will increase, even when dating of glacial deposits by TL is impossible. |
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