Multidisciplinary approach for paleoenvironmental reconstruction in loess-paleosol studies of the Darai Kalon section, Southern Tajikistan

Dodonov, A.E.; Sadchikova, T. A.; Sedov, Sergey; Симакова, А.Н.; Zhou, Liping

doi:10.1016/j.quaint.2005.12.001

Cited by 59 publications

(30 citation statements)

References 10 publications

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“…Thus loess deposits are well-suited to reconstructing moisture changes on earth orbital timescales (Ding et al, 2002a) and even on millennial timescales (cf., Chen et al, 1997;Porter and An, 1995;Rao et al, 2013a). Loess deposits are widely distributed in ACA from the Iranian loess plateau in the west to the Xinjiang region in the east (Dodonov, 2006;Dodonov et al, 2006), and are especially well-developed on the northern slopes of the Tienshan Mountains (Liu, 1985) and in the Yili River valley (Ye, 2000;Feng et al, 2011). Here we develop a proxy record based on measurements of environmental magnetic properties and soil color from four loess-paleosol sequences on the northern slopes of the Tienshan Mountains and in Yili River valley, the core area of the "westerly-dominated regime" of moisture changes in ACA, in order to reconstruct the history of moisture evolution during the Holocene.…”

Section: Introductionmentioning

confidence: 99%

A persistent Holocene wetting trend in arid central Asia, with wettest conditions in the late Holocene, revealed by multi-proxy analyses of loess-paleosol sequences in Xinjiang, China

Chen

Jia

Chen

et al. 2016

Quaternary Science Reviews

271

187

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Section: Introductionmentioning

confidence: 99%

A persistent Holocene wetting trend in arid central Asia, with wettest conditions in the late Holocene, revealed by multi-proxy analyses of loess-paleosol sequences in Xinjiang, China

Chen

Jia

Chen

et al. 2016

Quaternary Science Reviews

271

187

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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.…”

mentioning

confidence: 99%

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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“…In a study of a mid‐Pleistocene loess–palaeosol succession in South Tajikistan, Dodonov et al . () suggested that the lower palaeosols were most developed and were indicative of soil formation under a more humid climate, whereas the upper soils were less developed and reflected drier environments. The formation of palaeosols during interglacial/interstadial epochs resulted from the high intensity of the summer monsoon, the intensity of which has reduced significantly since the late mid‐Pleistocene.…”

Section: Discussionmentioning

confidence: 99%

Clay record of climate change since the mid‐Pleistocene in Jiujiang, south China

Hong

Yin

et al. 2012

Boreas

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To obtain a better understanding of climate change in south China in the Quaternary, a clay mineralogical study was undertaken on the red earth profile at Jiujiang, using X-ray diffraction (XRD) and particle-size distribution analysis methods. The XRD results showed that the clay minerals of the Jiujiang red earth were mainly mixed-layer illite-smectite (I/S), illite, kaolinite and vermiculite, with trace amounts of mixed-layer kaolinite-smectite (K/S). Changes in clay mineral composition displayed a trend of three-stage evolution. The higher mixed-layer I/S clays and kaolinite contents in the lower portion suggest extremely warm and humid climates over the period c. 700 to c. 350 ka ago. A gradual decrease in I/S clays and kaolinite reveals a gradual climate change from warm/humid to cool/dry during the period c. 350 to c. 130 ka ago. The higher illite and vermiculite contents indicate a relatively cool and dry climate during the period since c. 130 ka ago. The particle-size distribution pattern of the upper section was similar to that of the Xiashu loess, while that of the middle to lower section was similar to those of fluvially reworked red earth. A rapid increase in the abundance of large grain-size components at 2.6 m depth indicates an intensification of the winter monsoon and a cool and dry climate during the period, in good agreement with results from the clay mineral composition and homogeneous structure. The red earth sequences in south China could probably be used to test the response of tropical to subtropical regions to global climate changes.

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Multidisciplinary approach for paleoenvironmental reconstruction in loess-paleosol studies of the Darai Kalon section, Southern Tajikistan

Cited by 59 publications

References 10 publications

A persistent Holocene wetting trend in arid central Asia, with wettest conditions in the late Holocene, revealed by multi-proxy analyses of loess-paleosol sequences in Xinjiang, China

A persistent Holocene wetting trend in arid central Asia, with wettest conditions in the late Holocene, revealed by multi-proxy analyses of loess-paleosol sequences in Xinjiang, China

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

Clay record of climate change since the mid‐Pleistocene in Jiujiang, south China

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