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Fig. 1
Landform (A-B) and sampled yardangs (C-D) in the Qaidam Basin. The elevations measured by differential GPS were used in Fig. 1C as it's more accurate.
Fig. 2
Yardang landform and sampling sections. The filled red circles denote the positions of sampling.
Fig. 3
Dose recovery test for MET-pIRIR protocols (A) and two-step pIRIR protocols (B).
Fig. 4
Luminescence properties of MET-pIRIR signals using the protocol in Table 2a: (A) Decay curves of K-feldspars and polyminerals, (B) Des at different stimulation temperatures and (C) corresponding DRCs for sample YD9-B, (D) DRCs of MET-pIRIR250 signals of sample YD8-B and their SGC. (E) DRC of MET-pIRIR250 signal of sample of field saturation in the QB, using two exponentials function. (F) Saturate ratio. It is expressed by the ratios of (Ln/Tn) (natural signals) and (Ls/Tn), the latter is derived from ~1969 Gy and field saturated dose for fine-grain polyminerals and coarse-grain K-feldspars, respectively (no fine-grain sample of field saturation were collected).
Fig. 5
Residual doses as a function of sunlight bleaching time for the MET-pIRIR signals of sample YD9-B.
Fig. 6
Luminescence properties of two-step pIRIR signals. (A) Decay curves of IR50IR250 signals, (B) DRCs and natural doses of IRSL50 and IR50IR250, and (C) Sensitivity changes of pIR50IR250 for sample YD9-B.
Fig. 7
Fading test of IRSL50 (A) and pIR50IR250 (B) signals of sample YD9-B, and Comparison of multiple age results (C).
Fig. 8
(A) Scatter diagram of lacustrine ages against altitudes. (B) Probability density of lacustrine ages. (C) The composite δ 18O record of stalagmites (Cheng et al., 2016). (D) Insolation at 30° N (Berger and Loutre, 1991). (E) Composite sea level stack (Spratt and Lisiecki, 2016).
The results corrected by Huntley (2006) method.
Function
Sample
IRSL50
(n/N)
(n/N)_SS
Measured Dea (Gy)
Corrected D0b (Gy)
Corrected Dec (Gy)
Corrected Aged (ka)
1EXP
YD6-B
0.54±0.02
0.60±0.13
397±16
372±1
973±124
240±34
YD7-B
0.43±0.01
0.58±0.14
345±11
465±1
642±29
229.0±19
YD7-C
0.52±0.02
0.59±0.13
429±18
422±1
981±85
236±25.8
YD8-B
0.48±0.01
0.57±0.14
427±14
479±1
886±49
330±29
YD9-B
0.44±0.01
0.59±0.14
364±10
467±1
700±27
271±21
GOK
YD6-B
0.46±0.02
0.60±0.17
401±20
362±1
1040±110
256±32
YD7-B
0.37±0.01
0.60±0.16
345±12
501±2
673±30
240±19
YD7-C
0.34±0.01
0.62±0.15
423±21
463±3
1070±82
257±26
YD8-B
0.40±0.01
0.57±0.12
428±17
494±1
945±59
352±32
YD9-B
0.32±0.01
0.59±0.12
365±11
583±1
733±31
284±23
Age results of MET-pIRIR250 with sample informations.