Quartz OSL and K-feldspar pIRIR dating of typical sediments over the past 20 000 years from the Tengger Desert， northern China

doi:10.7522/j.issn.1000-694X.2022.00136

Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (3): 69-85.DOI: 10.7522/j.issn.1000-694X.2022.00136

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Quartz OSL and K-feldspar pIRIR dating of typical sediments over the past 20 000 years from the Tengger Desert， northern China

Ying Wang(), Shuangwen Yi(), Zhiwei Xu, Haochen Zhang, Xusheng Li

School of Geography and Ocean Sciences，Nanjing University，Nanjing 210000，China

Received:2022-08-31 Revised:2022-11-10 Online:2023-05-20 Published:2023-05-31
Contact: Shuangwen Yi

Abstract

Abstract:

Sedimentary records of the late Quaternary preserved in the deserts are important archives to reconstruct the paleoclimate and paleoenvironmental change. In recent years， different dating methods have been used to establish chronologies of aeolian and lacustrine sediments in the deserts， especially the Optically Stimulated Luminescence （OSL） dating technology. However， it still has some uncertainties whether the luminescence dating techniques could provide reliable ages for relatively young samples. In this study， several sediments were collected from different sites in the Tengger Desert， and their ages were measured by quartz SAR-OSL and K-feldspar pIRIR₁₅₀ dating methods. A set of tests， such as the dose recovery， fading and residual tests， were carried out to explore the applicability and reliability of the K-feldspar pIRIR₁₅₀ dating protocol in this area. The results suggest that the K-feldspar samples were well bleached before deposition. Residual doses of pIRIR signals are between 0.07-0.27 Gy and the dose recovery ratio is basically equal to 1 within the dose range of 60 Gy （equal to about 20，000 years）. The corrected K-feldspar pIRIR₁₅₀ ages are generally overestimated， while the uncorrected pIRIR₁₅₀ ages are in good agreement with the quartz SAR-OSL ages， indicating the uncertainties of g-value correction. Based on the quartz SAR-OSL and K-feldspar pIRIR₁₅₀ ages， it is found that the geomorphological evolution at different sites in the study area show strong heterogeneity at local scales， while at glacial-interglacial time scales， their changes are broadly consistent with regional climatic changes. During the Last Glacial Maximum and Deglacial period， the dunes were mostly active and vegetation was degraded， and the areas of lakes and oases were relatively decreased. In contrast， dune activity was restricted and vegetation coverage was increased during the Early and Middle Holocene， and the lakes and oases were relatively expanded. During the past few hundreds of years， different sites in the Tengger Desert have probably undergone multiple phases of dune activation and stabilization， which may be related to not only regional environmental changes but also local disturbances.

Key words: OSL dating, K-feldspar pIRIR₁₅₀ dating, geomorphological reconstruction, aeolian environmental change, Tengger Desert

CLC Number:

P533

Ying Wang, Shuangwen Yi, Zhiwei Xu, Haochen Zhang, Xusheng Li. Quartz OSL and K-feldspar pIRIR dating of typical sediments over the past 20 000 years from the Tengger Desert， northern China[J]. Journal of Desert Research, 2023, 43(3): 69-85.

Figures/Tables 12

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步骤	石英 SAR -OSL		钾长石pIRIR₁₅₀
步骤	测试环节	观测值	测试环节	观测值
1	附加再生剂量D_i^*	—	附加再生剂量D_i^*	—
2	预热（Preheat，200 ℃，10 s）	—	预热（Preheat，180 ℃，60 s）	—
3	蓝光激发（125 ℃，40 s）	L_X	红外激发（50 ℃，100 s）	L_X₅₀
4	实验剂量D_t	—	红外激发（150 ℃，100 s）	L_X₁₅₀
5	热释光（Cutheat，160 ℃）	—	实验剂量D_t	—
6	蓝光激发（125 ℃，40 s）	T_X	热释光（Cutheat，180 ℃，60 s）	—
7	返回第一步	—	红外激发（50 ℃，100 s）	T_X₅₀
8		—	红外激发（150 ℃，100 s）	T_X₁₅₀
9		—	返回第一步	—

步骤	石英 SAR -OSL		钾长石pIRIR₁₅₀
步骤	测试环节	观测值	测试环节	观测值
1	附加再生剂量D_i^*	—	附加再生剂量D_i^*	—
2	预热（Preheat，200 ℃，10 s）	—	预热（Preheat，180 ℃，60 s）	—
3	蓝光激发（125 ℃，40 s）	L_X	红外激发（50 ℃，100 s）	L_X₅₀
4	实验剂量D_t	—	红外激发（150 ℃，100 s）	L_X₁₅₀
5	热释光（Cutheat，160 ℃）	—	实验剂量D_t	—
6	蓝光激发（125 ℃，40 s）	T_X	热释光（Cutheat，180 ℃，60 s）	—
7	返回第一步	—	红外激发（50 ℃，100 s）	T_X₅₀
8		—	红外激发（150 ℃，100 s）	T_X₁₅₀
9		—	返回第一步	—

实验编号	样品名称	深度 /m	地层类型	U含量 /（mg·kg^-1）	Th含量 /（mg·kg^-1）	K含量 /%	石英剂量率 /（Gy·ka^-1）	钾长石剂量率/(Gy·ka^-1)
NJU2395	N01A-S-380cm	3.8	风沙层	0.53±0.04	2.22±0.10	2.31±0.07	2.58±0.08	3.10±0.13
NJU2396	N01B-15cm	0.15	湖相层	1.30±0.06	5.31±0.18	1.98±0.06	2.65±0.11	3.25±0.17
NJU2397	N01B-60cm	0.6	湖相层	1.01±0.05	4.08±0.15	1.63±0.05	2.15±0.09	2.74±0.15
NJU2398	N01B-180cm	1.8	风沙层	0.71±0.04	2.45±0.10	2.10±0.06	2.48±0.08	3.02±0.13
NJU2399	N01B-300cm	3.0	风沙层	1.04±0.05	3.43±0.13	2.04±0.06	2.53±0.08	3.13±0.14
NJU2400	N01B-420cm	4.2	风沙层	0.68±0.05	2.06±0.09	2.19±0.07	2.48±0.08	3.02±0.13
NJU2401^*	N01B-500cm	5.0	风沙层	0.85±0.05	2.45±0.10	2.19±0.07	2.33±0.10	2.87±0.15
NJU3665	XJZ-10cm	0.1	湖相层	1.68±0.08	7.55±0.38	1.86±0.09	2.82±0.13	3.43±0.18
NJU3666	NHN-70cm	0.7	次生黄土	2.23±0.11	10.77±0.54	1.98±0.10	3.16±0.14	4.05±0.22
NJU4011	YWQ1-20cm	0.2	湖相层	1.15±0.06	5.52±0.28	1.88±0.09	2.55±0.12	3.17±0.17
NJU4012	YWQ1-50cm	0.5	湖相层	1.14±0.06	5.73±0.29	1.85±0.09	2.49±0.12	3.14±0.17
NJU4013	YWQ2-20cm	0.2	古土壤	2.22±0.11	7.64±0.38	1.90±0.10	2.93±0.13	3.66±0.20
NJU4014	YWQ2-75cm	0.75	风沙层	1.22±0.06	5.89±0.29	1.81±0.09	2.59±0.09	3.26±0.15

实验编号	样品名称	深度 /m	地层类型	U含量 /（mg·kg^-1）	Th含量 /（mg·kg^-1）	K含量 /%	石英剂量率 /（Gy·ka^-1）	钾长石剂量率/(Gy·ka^-1)
NJU2395	N01A-S-380cm	3.8	风沙层	0.53±0.04	2.22±0.10	2.31±0.07	2.58±0.08	3.10±0.13
NJU2396	N01B-15cm	0.15	湖相层	1.30±0.06	5.31±0.18	1.98±0.06	2.65±0.11	3.25±0.17
NJU2397	N01B-60cm	0.6	湖相层	1.01±0.05	4.08±0.15	1.63±0.05	2.15±0.09	2.74±0.15
NJU2398	N01B-180cm	1.8	风沙层	0.71±0.04	2.45±0.10	2.10±0.06	2.48±0.08	3.02±0.13
NJU2399	N01B-300cm	3.0	风沙层	1.04±0.05	3.43±0.13	2.04±0.06	2.53±0.08	3.13±0.14
NJU2400	N01B-420cm	4.2	风沙层	0.68±0.05	2.06±0.09	2.19±0.07	2.48±0.08	3.02±0.13
NJU2401^*	N01B-500cm	5.0	风沙层	0.85±0.05	2.45±0.10	2.19±0.07	2.33±0.10	2.87±0.15
NJU3665	XJZ-10cm	0.1	湖相层	1.68±0.08	7.55±0.38	1.86±0.09	2.82±0.13	3.43±0.18
NJU3666	NHN-70cm	0.7	次生黄土	2.23±0.11	10.77±0.54	1.98±0.10	3.16±0.14	4.05±0.22
NJU4011	YWQ1-20cm	0.2	湖相层	1.15±0.06	5.52±0.28	1.88±0.09	2.55±0.12	3.17±0.17
NJU4012	YWQ1-50cm	0.5	湖相层	1.14±0.06	5.73±0.29	1.85±0.09	2.49±0.12	3.14±0.17
NJU4013	YWQ2-20cm	0.2	古土壤	2.22±0.11	7.64±0.38	1.90±0.10	2.93±0.13	3.66±0.20
NJU4014	YWQ2-75cm	0.75	风沙层	1.22±0.06	5.89±0.29	1.81±0.09	2.59±0.09	3.26±0.15

实验编号	样品名称	深度 /m	石英OSL 等效剂量 /Gy	钾长石pIRIR₁₅₀ 等效剂量 /Gy	测片数（A/B）^*	石英OSL 年代 /ka	钾长石pIRIR₁₅₀ 未校正年代 /ka	g-值 /（%/10a）^**	钾长石pIRIR₁₅₀ 校正年代 /ka
NJU2395	N01A-S-380cm	3.8	26.47±1.47	31.47±1.95	21/10	10.27±0.65	10.14±0.77	—	12.56±1.59
NJU2396	N01B-15cm	0.15	20.75±0.45	24.75±0.43	24/15	7.83±0.37	7.62±0.41	2.27±0.89	9.41±1.07
NJU2397	N01B-60cm	0.6	25.80±0.47	32.79±0.45	20/14	12.02±0.56	11.97±0.67	—	14.86±1.67
NJU2398	N01B-180cm	1.8	39.99±1.03	45.08±0.88	19/14	16.14±0.65	14.91±0.72	—	18.57±2.06
NJU2399	N01B-300cm	3.0	33.01±1.08	42.98±0.64	22/14	13.03±0.58	13.74±0.64	—	17.09±1.86
NJU2400	N01B-420cm	4.2	34.23±0.91	41.18±0.59	22/14	13.80±0.57	13.66±0.63	—	16.99±1.90
NJU2401	N01B-500cm	5.0	33.05±1.22	40.17±1.23	18/14	14.19±0.82	13.98±0.85	—	17.39±2.06
NJU3665	XJZ-10cm	0.1	0.88±0.11	0.52±0.01	5/17	0.31±0.04	0.15±0.01	1.68±0.88	0.17±0.02
NJU3666	NHN-70cm	0.7	18.90±0.62	23.32±0.47	27/15	5.97±0.33	5.77±0.33	1.82±0.84	6.79±0.58
NJU4011	YWQ1-20cm	0.2	1.88±0.09	2.61±0.05	14/15	0.74±0.05	0.83±0.05	1.56±0.85	0.94±0.09
NJU4012	YWQ1-50cm	0.5	2.27±0.12	3.09±0.20	16/14	0.91±0.06	0.99±0.08	1.61±0.89	1.13±0.13
NJU4013	YWQ2-20cm	0.2	22.32±0.82	31.64±0.50	20/15	7.63±0.45	8.64±0.48	0.99±0.84	9.42±0.90
NJU4014	YWQ2-75cm	0.75	19.33±1.05	25.04±1.25	19/13	7.47±0.48	7.69±0.53	1.73±0.88	8.99±1.02

Quartz OSL and K-feldspar pIRIR dating of typical sediments over the past 20 000 years from the Tengger Desert， northern China

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