Loess of Central Asia

Dodonov, A.E.

doi:10.1007/bf00186015

Cited by 99 publications

(52 citation statements)

References 7 publications

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“…In recent years, international Quaternary geologists have paid much attention to the loess sediments in Tajikistan and southern Kazakhstan, which are situated in the southern part of Central Asia [17][18][19][20][21][22][23][24]. Previous studies show that paleoenvironment information recorded in south Central Asia loess sediments is very comparable with that recorded in Chinese loess.…”

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confidence: 85%

Loess magnetic properties in the Ili Basin and their correlation with the Chinese Loess Plateau

Song

Shi

Fang

et al. 2010

Sci. China Earth Sci.

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Over the past two decades, magnetoclimatological studies of loess-paleosol sequences in the Chinese Loess Plateau (CLP) have made outstanding achievements, which greatly promote the understanding of East Asian paleomonsoon evolution, inland aridification of Asia, and past global climate changes. Loess magnetic properties of the CLP have been well studied. In contrast, loess magnetic properties from outside the CLP in China have not been fully understood. We have little knowledge about the magnetic properties of loess in the Ili Basin, an intermontane depression of the Tianshan (or Tien Shan) Mountains. Here, we present the results of rock magnetic measurements of the Ili loess including mass magnetic susceptibility (χ) and anhysteretic remanent magnetization (ARM), high/low temperature dependence of susceptibility (TDS) and hysteresis, as well as X-ray diffraction (XRD) for mineral analysis. Based on the comparison with loess-paleosol sequences in the CLP (hereafter referred to as the Chinese loess), we discuss the possible magnetic susceptibility enhancement mechanism of the Ili loess. The results show that 1) the total magnetic mineral concentration of the Ili loess is far lower than that of the Chinese loess, though they have similar magnetic mineral compositions. The ferrimagnetic minerals in the Ili loess are magnetite and maghemite, and the antiferromagnetic mineral is hematite; XRD analysis also identifies the presence of ilmenite. The ratio of maghemite is lower in the Ili loess than in the Chinese loess, but the ratios of magnetite and hematite are higher in the Ili loess than in the Chinese loess.2) The granularity of magnetic minerals in the Ili loess, dominated by pseudo-single domain (PSD) and multi-domain (MD) grains, is generally much coarser than that of the Chinese loess. Ultrafine pedogenically-produced magnetic grains have a very limited contribution to the susceptibility enhancement. Rather, PSD and MD particles of magnetite and maghemite are the main contributors to the enhancement of susceptibility in the Ili loess. 3) The susceptibility enhancement mechanism for the Ili loess is complicated and superimposes both a wind velocity/vigor model (Alaskan or Siberian model) and the in situ ultrafine grain pedogenic model; the former might play an important role in the Ili loess. 4) Magnetic susceptibility enhancements of the Ili loess are related not only to the eolian input of the source area, but also to the local climate, landform, and geological background. Therefore, great care should be taken when reconstructing paleoclimate using magnetic susceptibility data from the Ili loess. loess, magnetic property, magnetic susceptibility, the Ili Basin, the Chinese Loess Plateau Citation: Song Y G, Shi Z T, Fang X M, et al. Loess magnetic properties in the Ili Basin and their correlation with the Chinese Loess Plateau.

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confidence: 85%

Loess magnetic properties in the Ili Basin and their correlation with the Chinese Loess Plateau

Song

Shi

Fang

et al. 2010

Sci. China Earth Sci.

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“…All the wells sampled were situated in loess. This loess, composed predominately of silicates and carbonates (Dodonov 1991), and the local alkaline rhyolites, likely have a high 87 Sr/ 86 Sr value.…”

Section: Strontium Isotopes In Groundwatermentioning

confidence: 99%

“…These loess deposits are widespread throughout central Asia covering the semi-arid regions on the periphery of all the major deserts including the Gobi Desert of northern China and Mongolia ( Figure 11) (Dodonov 1991).…”

Section: Regional Settingmentioning

confidence: 99%

Geochemical evolution of uraniferous soda lakes in Eastern Mongolia

Linhoff

Bennett

Puntsag³

et al. 2010

Environ Earth Sci

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“…For example, studies have shown that the groundwater in the voids, fissures, and pores of loess is mainly from atmospheric precipitation (Xue 1995;Yang et al 1982). Various properties of loess from many regions, including Central Asia (Dodonov 1991;Dodonov and Baiguzina 1995), Europe (Pesci 1997;Kukla 1977) and the United States (Jacobs et al 1997;Jacobs and Mason 2007), have been studied, but little if any tangible progress has been made relative to the infiltration and migration of water. Some research into the aeration of loess and the flow of groundwater has been conducted, but the loess layers enriched in groundwater have not yet been clearly classified (Xue 1995;Li et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Effect of Quaternary climatic change on modern hydrological systems in the southern Chinese Loess Plateau

Jing-bo

Cao

et al. 2014

Environ Earth Sci

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A systematic study was conducted to investigate the permeability, porosity, grain size, water content, mass percentage of carbonate, and magnetic susceptibility of representative Middle Pleistocene loess-palaeosol layers (from L1 to S5) on the Chinese Loess Plateau. The average infiltration rate of the loess (0.93 mm/min) was higher than the palaeosol (0.62 mm/min), and the porosity of loess was higher than that of palaeosol. The loess layers have greater water-bearing capacity and, therefore, they are more likely to form aquifers while the palaeosol layers are more prone to form aquitards. The greater permeability and the larger water-bearing space of the loess layers are largely the result of lower intensity pedogenesis due to the colder/drier climatic conditions at the time these sediments were deposited. Conversely, the weaker permeability and lesser waterbearing capacity of the palaeosol layers can be explained by the greater pedogenesis during the warmer/wetter climatic conditions. The studies demonstrate a compelling relationship between Pleistocene climate and modern hydrological systems in the southern Chinese Loess Plateau.

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Loess of Central Asia

Cited by 99 publications

References 7 publications

Loess magnetic properties in the Ili Basin and their correlation with the Chinese Loess Plateau

Loess magnetic properties in the Ili Basin and their correlation with the Chinese Loess Plateau

Geochemical evolution of uraniferous soda lakes in Eastern Mongolia

Effect of Quaternary climatic change on modern hydrological systems in the southern Chinese Loess Plateau

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