Loess stratigraphy of Central Asia: Palaeoclimatic and palaeoenvironmental aspects

Dodonov, A.E.; Baiguzina, L.L.

doi:10.1016/0277-3791(95)00054-2

Cited by 140 publications

(60 citation statements)

References 9 publications

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“…Glaciers in the region expanded during early and late MIS3 (Owen and Dortch, 2014). The apparent chronological link between increased primary loess accumulation and glacial expansion in the region contrasts with trends elsewhere indicating increased dust accumulation during dry and windy glacial conditions, and pedogenesis under comparatively wetter interglacial conditions (Ding et al, 2002;Dodonov and Baiguzina, 1995;Stevens et al, 2013;Sun et al, 2010). Our observations suggest a seesaw relationship between increased loess accumulation and glacial expansion during MIS3 (Fig.…”

Section: Eolian Dust Dynamics In Eastern Central Asia: Links To Atmosmentioning

confidence: 57%

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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Section: Eolian Dust Dynamics In Eastern Central Asia: Links To Atmosmentioning

confidence: 57%

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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“…During the late pleniglacial maximal extension of the ice sheets in northern Europe may have partially blocked penetration of the Atlantic air mass transfer to the east (e.g. Dodonov and Baiguzina, 1995). Model results of Van Huissteden and Pollard (2003) indicate a strong anticyclonal circulation over the Scandinavian ice cap and low wind intensity in the middle Danube Basin during the last glacial maximum.…”

Section: Discussionmentioning

confidence: 99%

Late Pleistocene loess‐palaeosol sequences in the Vojvodina region, north Serbia

Marković¹,

Bokhorst²,

Vandenberghe³

et al. 2007

J Quaternary Science

250

191

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Late Pleistocene loess-palaeosol sequences are widespread in the Vojvodina region, with thicknesses reaching a maximum of about 20 m. Our investigations include more than 40 of these loess sections. Geochronology of the last glacial loess-palaeosol sequences, based on luminescence dating and amino acid racemisation, provides correlations between Upper Pleistocene loess-palaeosol sediments in Vojvodina and comparable deposits at other European localities. Sedimentary logs of magnetic susceptibility, grain-size measurements and carbonate content, combined with malacological evidence, indicate two main relatively cold and arid phases during the last glacial period, related to intensive accumulation of loess units L1L1 and L1L2, as well as many brief episodes of dry and windy climatic conditions, suggesting a possible relationship with cold events recorded in the North Atlantic region. Generally, late Pleistocene climate in the region was dry and relatively warm, compared with glacial period sites in central Europe, and was characterised by sharp differences between glacial and interglacial modes.New data and interpretations presented in this study emphasise the significance of loess-palaeosol sequences in Vojvodina for the reconstruction of the temporal and spatial evolution of late Pleistocene palaeoclimate in this part of Europe.

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“…This also coincided with a major cooling in the Lake Baikal region, central Siberia (Williams et al 1997) 2.47 my a at Luochuan (Lu et al 1999), and in Central Asia at 2.5 my a (Dodonov and Baiguzina 1995). There was also a dramatic increase in the deposition of aeolian dust into the Sea of Japan c. 2.5 my a (Xiao and An 1999).…”

Section: The Late Miocene and Pliocene Backgroundmentioning

confidence: 86%

Hominid Dispersals and Asian Biogeography during the Lower and Early Middle Pleistocene, c. 2.0-0.5 Mya

Dennell¹

2004

asi

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This paper examines the environmental context of human dispersals into Asia up to 0.5 mya. These dispersals were probably intermittent, often discontinuous, and initially confined to warm grasslands and open woodlands across southern Asia. During the Early Pleistocene, the effects of the uplift of Tibet and the inception of the monsoon were muted by the low-amplitude nature of northern hemisphere glaciations. By the Middle Pleistocene, further uplift, stronger monsoonal circulation, and higher-amplitude, glacial-interglacial cycles made much of Southwest and Central Asia more arid than previously. Two other Mid-Pleistocene developments were important: first, the appearance of Acheulean assemblages, possibly as far east as southern China; and secondly, the first appearance of hominids at latitudes 40–45oN during interglacial episodes. Hominid dispersals in both Europe and Asia were probably broadly similar in that hominids did not habitually live beyond 40oN until c. 500 kya. Rather than dividing Asia longitudinally into areas east or west of the Movius line, latitudinal divisions between warm/hot and cool/cold environments might be more appropriate.

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Loess stratigraphy of Central Asia: Palaeoclimatic and palaeoenvironmental aspects

Cited by 140 publications

References 9 publications

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

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

Late Pleistocene loess‐palaeosol sequences in the Vojvodina region, north Serbia

Hominid Dispersals and Asian Biogeography during the Lower and Early Middle Pleistocene, c. 2.0-0.5 Mya

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