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Selective concentration and enumeration of tephra shards from lake sediment cores
N.L. Rose
Environmental Change Research Centre, University College London, 26 Bedford Way, London WC1H OAP, UK
P.N.E. Golding
Environmental Change Research Centre, University College London, 26 Bedford Way, London WC1H OAP, UK
R.W. Battarbee
Environmental Change Research Centre, University College London, 26 Bedford Way, London WC1H OAP, UK
This paper describes a technique for the enumeration of tephra shards from lake sediment cores whereby approximately 85% of unwanted sediment fractions (organic matter, biogenic silica, carbonates) are removed by selective stepwise chemical attack. The order of 100 samples can be prepared simultaneously in a modest-sized water-bath and the recovery rate of the technique is greater than 90%. The procedure is appli cable to all lake sediment types.
Key Words: Tephra tephrochronology lake sediments preparation pretreatment extraction.
The Holocene, Vol. 6, No. 2,
243-246 (1996)
DOI: 10.1177/095968369600600210

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