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The residual ages and bleaching of K-feldspar post-IR IRSL (pIRIR) signals (pIR 50 IR 170 , pIR 50 IR 290 , and pIR 200 IR 290 ) for a variety of modern sediment sources to the Bosten Lake basin in the southern Tian Shan of arid central Asia were assessed to identify the most appropriate facies to sample for ascertaining well-bleached, depositional ages associated with Quaternary paleolake development. Results indicate pIR 50 IR 290  residual ages for pluvial fan, fluvial, and eolian sediments cluster at 40–6, 6–3, and 2–1 ka, respectively, and are depositional ages. Residual ages of pIR 200 IR 290  signals are twice that of pIR 50 IR 290  signals, while residual ages of pIR 50 IR 170  signals are similar to that of pIR 50 IR 290  signals for all samples. Eolian and fluvial samples show well-bleached, coarse-grained (90–125 μm) K-feldspar and poorly-bleached coarse grained K-feldspar from pluvial samples. High residual doses in fluvial and pluvial samples indicate it may not be advisable to apply pIRIR dating utilising different pIRIR signals to Holocene lacustrine samples. However, the residual ages measured for eolian deposits are small and can allow precise and robust assessment of paleolake development by targeting the K-feldspar pIR 50 IR 170  signal to date Holocene samples and the pIR 200 IR 290  and pIR 50 IR 290  signals to date Pleistocene samples.

geochronometria

The Bleaching of Different K-Feldspar pIRIR Signals of Source Materials of Lacustrine Sediment – A Case Study from Bosten Lake Basin in Arid Central Asia