Residual luminescence signals of recent river flood sediments: A comparison between quartz and feldspar of fine- and coarse-grain sediments

Abstract

Sediments of the 2002 millenial flood in Saxony were investigated in respect to their residual luminescence signals. A comparison of residual palaeodoses in fine- and coarse-grain quartz and feldspar extracted from sediments was made. The fine-grain quartz was extracted by treating the sediment with H2SiF6 that selectively dissolved fractions other than quartz. Tests using H2SiF6 and HF for an optimum extraction of fine grain quartz were also carried out. A clear difference between quartz and feldspar based palaeodoses could be observed. Distinctly lower De values for quartz indicated better bleaching. Residual De values ranged from 0.5 Gy to 16 Gy for fine-grain quartz and coarse-grain K-feldspars, respectively.