Geological Structure of the Quaternary Sedimentary Sequence in the Klaipeda Strait, Southeastern Baltic - The Baltic Sea Basin - page 139

Fig. 6.4 Glaciodislocated
inter-till sediments
represented by deformed
micro-layers of fine sand, silt
andclayinthecoreof
borehole 36888
(depth 33.5 m)

the inter-till sandy sediments sampled for IR-OSL dating were very similar in terms
of geological setting and lithological composition. Drilling technology, despite the
fact that it does not allow to remove the undisturbed core samples of sand, is quite
suitable for correct sampling for IR-OSL dating.

6.3.2 IR-OSL Measurements

All samples were prepared for the luminescence analysis according to standard lab-
oratory procedures (see, e.g. Molodkov and Bitinas 2006 ) . Briefly, alkali feldspar
grains of 100-150 m size were extracted from the sediment under subdued filtered

light in the laboratory by a procedure including wet sieving, heavy liquid floata-
tion (collecting 2.54-2.58 g/cm 3 fraction) and treatment by 10% HF for 15 min and
finally etching by 20-40%HCl. The IR-OSL measurements were carried out with an
Ingrid-Type SLM-1 reader using 860 nm stimulation by short laser pulses. Detection
was in the 380-430 nm wavelength range using a combination of 3 mm SZS-22

μ