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

.blurhash-client-img { display: none !important; }

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

Geochronometria

Volume 48 (2021): Issue 1 (January 2021)

By: Zhaojing Ding, Lupeng Yu, Zhongping Lai, Ping An, Xiaodong Miao, Ruru Xu and Zengqi Liu

Open Access

|Dec 2021

Figures & Tables

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.

Yardang landform and sampling sections. The filled red circles denote the positions of sampling.

Dose recovery test for MET-pIRIR protocols (A) and two-step pIRIR protocols (B).

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).

Residual doses as a function of sunlight bleaching time for the MET-pIRIR signals of 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.

Fading test of IRSL50 (A) and pIR50IR250 (B) signals of sample YD9-B, and Comparison of multiple age results (C).

(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
Function	Sample	(n/N)	(n/N)_SS	Measured D_e^a (Gy)	Corrected D₀^b (Gy)	Corrected D_e^c (Gy)	Corrected Age^d (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	L_x
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	L_x	IRSL 50°C for 500 s	-
8	IRSL 290°C for 100 s	-	IRSL 250°C for 500 s	T_x
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	T_x
16	IRSL 290°C for 100 s	-
17	IRSL 320°C for 100 s	-
18	Return to step 1

DOI: https://doi.org/10.2478/geochr-2020-0016 | Journal eISSN: 1897-1695

Journal RSS Feed

Language: English

Page range: 313 - 324

Submitted on: Feb 15, 2019

|

Accepted on: Apr 15, 2020

|

Published on: Dec 31, 2021

Published by: Sciendo

In partnership with: Paradigm Publishing Services

Publication frequency: 1 issue per year

Keywords:

wind-erosion of Yardang,

feldspar luminescence dating,

anomalous fading,

glacial-interglacial scale environmental change,

Qarhan Salt Lake

Related subjects:

Geosciences, other

© 2021 Zhaojing Ding, Lupeng Yu, Zhongping Lai, Ping An, Xiaodong Miao, Ruru Xu, Zengqi Liu, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Previous article Volume 48 (2021): Issue 1 (January 2021)Next article