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Post-IR Irsl Chronology of Paleo-Lacustrine Sediments from Yardangs in the Qaidam Basin, NE Tibetan Plateau

Zhaojing Ding
Zhaojing Ding
, 
Lupeng Yu
Lupeng Yu
, 
Zhongping Lai
Zhongping Lai
, 
Ping An
Ping An
, 
Xiaodong Miao
Xiaodong Miao
, 
Ruru Xu
Ruru Xu
 e 
Zengqi Liu
Zengqi Liu
   | 31 dic 2021
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Pubblicato online: 31 dic 2021
Pagine: 313 - 324
Ricevuto: 15 feb 2019
Accettato: 15 apr 2020
DOI: https://doi.org/10.2478/geochr-2020-0016
Parole chiave
© 2019 Zhaojing Ding et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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.
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.
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).
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).
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.
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.
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).
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).
(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.

(a) MET-pIRIR250 of Feldspar (b) pIR50IR250 of Feldspar
Step Treatment Measured Treatment Measured
1 Dose - Dose -
2 Preheat 320°C for 60 s - Preheat 280°C for 60 s -
3 IRSL 50°C for 100 s - IRSL 50°C for 500 s -
4 IRSL 100°C for 100 s - IRSL 250°C for 500 s Lx
5 IRSL 150°C for 100 s - Test dose -
6 IRSL 200°C for 100 s - Preheat 280°C for 60 s -
7 IRSL 250°C for 100 s Lx IRSL 50°C for 500 s -
8 IRSL 290°C for 100 s - IRSL 250°C for 500 s Tx
9 Test dose - Return to step 1
10 Preheat 320°C for 60 s -
11 IRSL 50°C for 100 s -
12 IRSL 100°C for 100 s -
13 IRSL 150°C for 100 s -
14 IRSL 200°C for 100 s -
15 IRSL 250°C for 100 s Tx
16 IRSL 290°C for 100 s -
17 IRSL 320°C for 100 s -
18 Return to step 1
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