Luminescence chronology and environmental implications of palaeolacustrine sediments beneath linear dunes in northern Qarhan Salt Lake region

doi:10.7522/j.issn.1000-694X.2020.00102

Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (1): 101-110.DOI: 10.7522/j.issn.1000-694X.2020.00102

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Luminescence chronology and environmental implications of palaeolacustrine sediments beneath linear dunes in northern Qarhan Salt Lake region

Min Cao¹^,²(), Lupeng Yu²(), Ping An², Zhibao Dong³, Junxiang Zhao⁴, Zhongping Lai⁵, Changsheng Wang²

^1.School of Earth Sciences，China University of Geosciences （Wuhan），Wuhan 430074，China
^2.Luminescence Research Laboratory，Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection，School of Resource and Environmental Sciences，Linyi University，Linyi 276000，Shandong，China
^3.School of Geography and Tourism，Shaanxi Normal University，Xi’an 710062，China
^4.Institute of Crustal Dynamics，China Earthquake Administration，Beijing 100085，China
^5.Institute of Marine Sciences，Shantou University，Shantou 515063，Guangdong，China

Received:2020-04-27 Revised:2020-10-22 Online:2021-01-29 Published:2021-01-29
Contact: Lupeng Yu

Abstract

Abstract:

Studies of late Quaternary geomorphic evolution and paleoenvironmental changes in the Qaidam Basin had been hindered by chronology. In this study， multiple-elevated-temperature post-IR IRSL （MET-pIRIR） procedure of potassium feldspar was applied to date surficial paleolacustrine sediments beneath linear dunes in northern Qarhan Salt Lake region， close to the depocenter of the Qaidam Basin， based on which the palaeoenvironmental implications were discussed preliminarily. The results showed that： An obvious D_e plateau between the stimulation temperatures of 250 ℃ and 290 ℃ indicated the anomalous of the IRSL signals of K-feldspar were negligible， thus ensuring the reliability of the dating results； The ages， ca. 200-180 ka， of paleolacustrine sediments supported the existence of a mega Qaidam Lake during Marine Isotope Stage 7； The absence of overlying sediments indicated severe wind erosion in surficial sediments in the depocenter of the Qaidam Basin， reminding that the sedimentary records were difficult to keep continuous even in glacial-interglacial scale； The huge hiatus between late Holocene linear dunes and mid-Pleistocene lacustrine sediments implies that the late accumulation of linear dunes was not directly hindered by the existence of the mega Qaidam Lake. The application of potassium feldspar MET-pIRIR_{dating will be crucial for the studies of paleoenvironmental， paleoclimatic， and geomorphologic evolution in the Qaidam Basin since mid-Pleistocene.}

Key words: Qaidam Basin, linear dunes, MET-pIRIR dating of K-feldspar, equivalent dose, wind erosion

CLC Number:

P531

Min Cao, Lupeng Yu, Ping An, Zhibao Dong, Junxiang Zhao, Zhongping Lai, Changsheng Wang. Luminescence chronology and environmental implications of palaeolacustrine sediments beneath linear dunes in northern Qarhan Salt Lake region[J]. Journal of Desert Research, 2021, 41(1): 101-110.

Figures/Tables 6

Fig.1 The location (A) and major landforms (B) of Qaidam Basin and samples location(C)

Fig.2 Sections and samples

Table 1 Dose rates and dating results of the samples

样品号	K含量 /%	Th含量 /（mg·kg^-1）	U含量 /（mg·kg^-1）	深度 /m	剂量率 /（Gy·ka^-1）	D_e/Gy		年代/ka
样品号	K含量 /%	Th含量 /（mg·kg^-1）	U含量 /（mg·kg^-1）	深度 /m	剂量率 /（Gy·ka^-1）	CAM	MAM	CAM	MAM
17 CEH4-1A	1.31±0.08	10±0.50	3.3±0.62	20	2.93±0.23	637±30	504±38	217±17	172±20
				10	2.99±0.23			213±17	168±20
				5	3.06±0.23			208±20	165±19
17 CEH4-3A	1.83±0.07	9.7±0.49	2.8±0.68	20	3.16±0.24	648±25	572±42	205±14	181±22
				10	3.22±0.24			201±14	178±22
				5	3.29±0.24			197±13	174±21

Fig.3 Six growth curves of MET-pIRIR250 （A） and comparison between SGC Des and SAR Des of samples （B）

Fig.4 Decay curves (A), SGC curves (B) and Des at different stimulation temperatures (C) of 17 CEH4-1A and comparison between 250 ℃ Des and 290 ℃ Des of all aliquots

Fig.5 De distribution and age models results of samples (darker bar: MAM, lighter bar: CAM)

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Luminescence chronology and environmental implications of palaeolacustrine sediments beneath linear dunes in northern Qarhan Salt Lake region

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