A luminescence dating study of the upper part of the loess-palaeosol sequence at Kuldara, Khovaling Loess Plateau, Tajikistanстатья
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Аннотация:The aim of this study was to develop an independent luminescence chronology for the
upper part of the important Loess Palaeolithic site at Kuldara (Khovaling Loess
Plateau, Tajikistan). We applied high sampling-depth resolution (n=85) luminescence
dating to the upper ~26 m of the sequence from loess L4 to pedocomplex PC0.
Luminescence characteristics of the post-IR200 IRSL290 signal from coarse-silt
polymineral grains are satisfactory (reproducible growth and good dose recovery).
Comparison with quartz OSL for samples <50 ka and results from modern analogues
(Challier et al., these proceedings) shows that the pIRIR200,290 signal is, as expected,
sufficiently bleached at deposition. The luminescence chronology extends back to
~250 ka and shows distinct erosional hiatuses ranging in duration from ~15 ka to a full
glacial-interglacial cycle (~100 ka); some of these breaks were not identifiable in the
field. We suggest an upper dating limit of 2,5xDc; this yields minimum ages of ~300 ka
for this material. Dust Accumulation Rates (DAR) are reconstructed for the Late
Pleistocene (from ~110 to ~40 ka) and reveal, next to several minor dust accumulation
peaks, two major peaks at the MIS5/4 transition (~73 ka) and at ~40 ka (MIS3b). We
conclude that detailed post-IR200 IRSL290 dating of loess-palaeosol sequences in
Tajikistan is necessary to exploit fully the potential of this important terrestrial (dust)
record.