Paleoenvironmental changes recorded in a luminescence dated loess/paleosol sequence from the Tianshan Mountains, arid central Asia, since the Penultimate Glaciation

Li, Guoqiang; Rao, Zhiguo; Duan, Yanwu; Xia, Dunsheng; Wang, Leibin; Madsen, David B.; Jia, Jia; Wei, Haitao; Qiang, Mingrui; Chen, Jianhui; Chen, Fahu

doi:10.1016/j.epsl.2016.05.008

Cited by 58 publications

(35 citation statements)

References 62 publications

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“…9 for comparison with their K-feldspar pIRIR 290 ages. Underestimation of quartz OSL ages for samples older than 50 ka from northern China has been observed by others (Buylaert et al 2007;Chapot et al 2012;Yi et al 2015;Li et al 2016). The quartz OSL ages for the four samples from the depths of 8.89, 10.76, 13.64 and 15.94 m vary between c. 35 and c. 56 ka, and are systematically younger than the K-feldspar pIRIR ages (Table 2).…”

Section: Comparison Between Quartz Osl and K-feldspar Pirir Agessupporting

confidence: 60%

“…However, 14 C datable materials (e.g. During the past few years, attempts have been made to apply quartz OSL dating to loess in ACA (Song et al 2012;Yang et al 2014;Li et al 2015Li et al , 2016. Quartz OSL dating using a singlealiquot regenerative dose (SAR) procedure is now widely applied to date Late Pleistocene sediments (Murray & Olley 2002;Wintle & Murray 2006;Wintle 2008).…”

Section: Absolute Chronologies For Lacustrine Successionsmentioning

confidence: 99%

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The luminescence dating chronology of a deep core from Bosten Lake (NWChina) in arid central Asia reveals lake evolution over the last 220 ka

Duan

Huang

et al. 2016

Boreas

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2017 (April): The luminescence dating chronology of a deep core from Bosten Lake (NW China) in arid central Asia reveals lake evolution over the last 220 ka.The lacustrine deposits of lakes in arid central Asia (ACA) potentially record palaeoclimatic changes on orbital and suborbital time scales, but such changes are still poorly understood due to the lack of reliable chronologies. Bosten Lake, the largest freshwater inland lake in China, is located in the southern Tianshan Mountains in central ACA. A 51.6-m-deep lacustrine succession was retrieved from the lake and 30 samples from the succession were used for luminescence dating to establish a chronology based on multi-grain quartz OSL and K-feldspar post-IR IRSL (pIRIR 290 ) dating. Quartz OSL ages were only used for samples from the upper part of the core. The K-feldspar luminescence characteristics (dose recovery test, anomalous fading test, first IR stimulation temperature plateau test) are satisfactory and from the relationship amongst the quartz OSL, IR 50 and pIRIR 290 doses we infer that the feldspar signals are likely to be well bleached at deposition. Bacon age-depth modelling was used to derive a chronology spanning the last c. 220 ka. The chronology, lithology and grain-size proxy record indicate that Bosten Lake formed at least c. 220 ka ago and that lake levels fluctuated frequently thereafter. A stable deep lake occurred at c. 220, 210-180, c. 165, 70-60, 40-30 and 20-5 ka, while shallow levels occurred at c. 215, 180-165, 100-70, 60-40 and 30-20 ka. Bosten Lake levels decreased by at least~29 m and possibly the lake even dried up between c. 160 and c. 100 ka. We suggest that the water-level fluctuations in the lakes of ACA may not respond directly to climatic changes and may be affected by a number of complex factors.

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Section: Comparison Between Quartz Osl and K-feldspar Pirir Agessupporting

confidence: 60%

Section: Absolute Chronologies For Lacustrine Successionsmentioning

confidence: 99%

The luminescence dating chronology of a deep core from Bosten Lake (NWChina) in arid central Asia reveals lake evolution over the last 220 ka

Duan

Huang

et al. 2016

Boreas

Self Cite

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“…In Central Asia, the loess deposits drape the piedmont slopes of the major mountain ranges -the Tian Shan, Alai, Altai, and Pamirs, from the Xinjiang province in China (Fang et al, 2002;Li et al, 2016Li et al, , 2015Liu, 1985;Song et al, 2014Song et al, , 2012 through Kazakhstan (Feng et al, 2011;Fitzsimmons et al, 2016;Machalett et al, 2006Machalett et al, , 2008, Kyrgyzstan (Youn et al, 2014), and Uzbekistan (Smalley et al, 2006), and into Tajikistan Li et al, 2016b;Yang et al, 2006). While recent years have witnessed increasing loessbased datasets in the region, the forcing mechanisms and the climatic conditions responsible for loess-paleosol sequences formation are as yet not systematically understood Li et al, 2016Li et al, , 2017Machalett et al, 2008;Song et al, 2018a, b).…”

Section: Y LI Et Al: Eolian Dust Dispersal Patterns Since the Last mentioning

confidence: 99%

Eolian dust dispersal patterns since the last glacial period in eastern Central Asia: insights from a loess-paleosol sequence in the Ili Basin

Song

Fitzsimmons

et al. 2018

Clim. Past

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Abstract. The extensive loess deposits of the Eurasian midlatitudes provide important terrestrial archives of Quaternary climatic change. As yet, however, loess records in Central Asia are poorly understood. Here we investigate the grain size and magnetic characteristics of loess from the Nilka (NLK) section in the Ili Basin of eastern Central Asia. Weak pedogenesis suggested by frequency-dependent magnetic susceptibility (χ fd %) and magnetic susceptibility (MS) peaks in primary loess suggest that MS is more strongly influenced by allogenetic magnetic minerals than pedogenesis, and may therefore be used to indicate wind strength. This is supported by the close correlation between variations in MS and proportions of the sand-sized fraction. To further explore the temporal variability in dust transport patterns, we identified three grain size end-members (EM1, mode size 47.5 µm; EM2, 33.6 µm; EM3, 18.9 µm) which represent distinct aerodynamic environments. EM1 and EM2 are inferred to represent grain size fractions transported from proximal sources in short-term, near-surface suspension during dust outbreaks. EM3 appears to represent a continuous background dust fraction under non-dust storm conditions. Of the three end-members, EM1 is most likely the most sensitive recorder of wind strength. We compare our EM1 proportions with mean grain size from the Jingyuan section in the Chinese loess plateau, and assess these in the context of modern and Holocene climate data. Our research suggests that the Siberian High pressure system is the dominant influence on wind dynamics, resulting in loess deposition in the eastern Ili Basin. Six millennial-scale cooling (Heinrich) events can be identified in the NLK loess records. Our grain size data support the hypothesis that the Siberian High acts as teleconnection between the climatic systems of the North Atlantic and East Asia in the high northern latitudes, but not for the mid-latitude westerlies.

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“…After application of the fading correction, the IR 50 ages tend to overestimate those from quartz especially at higher doses (equivalent to >40 ka). Li et al 2016). 7B); for samples with quartz ages >40 ka (i.e.…”

Section: Hb Loess Agementioning

confidence: 99%

Hebei loess section in the Anyemaqen Mountains, northeast Tibetan Plateau: a high‐resolution luminescence chronology

Chongyi

Sohbati

Murray

et al. 2018

Boreas

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The extensive aeolian deposits of the Tibetan Plateau (TP) represent important environmental archives, recording information about the past interplay between the Asian monsoon and Westerlies and the link between dust accumulation and Quaternary glaciations. In the northeast TP, mantles of sandy loess form a distinct belt lying between 3500 and 4500 m a.s.l. on the east-facing slopes of the Anyemaqen Mountains. However, there is little chronological information about the loess deposits in this region. This study provides a detailed chronology for loess formation in the region using luminescence dating. A total of 29 samples were collected from an 8-m-thick homogeneous loess section at Hebei (HB) in order to date sand-sized (63-90 lm) quartz and K-feldspar fractions using optically stimulated luminescence (OSL) and infrared stimulated luminescence (IRSL and pIRIR) signals, respectively. The resulting quartz and feldspar ages are in good agreement over the last 40 ka; beyond this (i.e. D e >120 Gy), the quartz age is underestimated, and the pIRIR 170 feldspar ages are considered more reliable. The HB loess section records continuous environmental information from c. 50 to c. 30 ka, i.e. throughout Marine Isotope Stage (MIS) 3. Mass accumulation rates (MARs) varied considerably over this period with increased dust accumulation around c. 38 ka and afterc. 32 ka; in between, and at the beginning of MIS 3 (50-40 ka), the dust accumulation rate was 50% lower. Finally, the HB section also records a MIS 2 hiatus of c. 17 ka duration, probably resulting from deflation. This study implies that loess deposition on the TP is predominantly an interglacial/interstadial phenomenon and the TP may be deflating at the same time as the Chinese Loess Plateau is accumulating, at least during MIS 2.

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Paleoenvironmental changes recorded in a luminescence dated loess/paleosol sequence from the Tianshan Mountains, arid central Asia, since the Penultimate Glaciation

Cited by 58 publications

References 62 publications

The luminescence dating chronology of a deep core from Bosten Lake (NWChina) in arid central Asia reveals lake evolution over the last 220 ka

The luminescence dating chronology of a deep core from Bosten Lake (NWChina) in arid central Asia reveals lake evolution over the last 220 ka

Eolian dust dispersal patterns since the last glacial period in eastern Central Asia: insights from a loess-paleosol sequence in the Ili Basin

Hebei loess section in the Anyemaqen Mountains, northeast Tibetan Plateau: a high‐resolution luminescence chronology

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