Distribution, provenance, and onset of the Xiashu Loess in Southeast China with paleoclimatic implications

Wang, Xiaoyong; Lu, Huayu; Zhang, Hanzhi; Wu, Jiayang; Hou, Xiaoxue; Fu, You‐Jun; Geng, Junyan

doi:10.1016/j.jseaes.2017.11.022

Cited by 37 publications

(6 citation statements)

References 54 publications

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“…Subsequently, at ~1.2–0.9 Ma, the Quaternary loess‐paleosol sequence of the CLP recorded a further expansion, evidenced by a coarsening of the grain size distribution and an increase in the sedimentation rate (Figures e and d). In addition, eolian deposition, which commenced first in north China, was extended to south and northeast China during this period (Li et al, ; Lu et al, ; Wang et al, ; Zeng et al, ; Zhang et al, ). This evidence points to the aridification of inland Asia and strengthening of the EAWM at 1.2–0.9 Ma, when the dust source regions expanded to the distal desert areas, as highlighted in our interpretation (Figure ).…”

Section: Discussionmentioning

confidence: 99%

Expansion of Dust Provenance and Aridification of Asia Since ~7.2 Ma Revealed by Detrital Zircon U‐Pb Dating

Zhang

Stevens

et al. 2018

Geophysical Research Letters

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The relative importance of global cooling and Tibetan Plateau uplift in driving the aridification of Asia during the late Cenozoic is debated, largely due to the lack of appropriate proxy indicators. Here we address this problem by investigating changes in the source of Chinese loess and Red Clay, which is directly controlled by changes in the extent and distribution of the arid zone of Asia and the intensity of the East Asian winter monsoon, using zircon U‐Pb dating of 27 levels in a near‐continuous eolian sedimentary sequence in southern Chinese Loess Plateau. The results show that source regions expanded stepwise at ~7.2, ~2.6, 1.2–0.9 Ma, and at the Last Glacial Maximum. These changes were synchronous with global cooling and ice cover expansion in the Northern Hemisphere, suggesting that the drivers of aridification of the Asian interior were intimately related to global cooling in the late Cenozoic.

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Section: Discussionmentioning

confidence: 99%

Expansion of Dust Provenance and Aridification of Asia Since ~7.2 Ma Revealed by Detrital Zircon U‐Pb Dating

Zhang

Stevens

et al. 2018

Geophysical Research Letters

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“…Sporopollen analysis of a typical loess stratum in Nanjing shows that herbaceous pollen dominated the total pollen assemblage, the sporopollen are mainly comprised of Compositae and Gramineae (subordinately artemisia and Chenopodiaceae), while arboreal pollen was mainly composed of Pinus, indicating a relatively arid and cold climate (Hao et al, 2010). The Ganzi loess in western Sichuan and the red earth in Chengdu plain (Figure 1) in the upper reaches of the Yangtze River have been confirmed as near-source eolian deposits formed in this period (Zhao et al, 2007;Qiao et al, 2007;Wang et al, 2018). The occurrence of sustained dust deposit reflects an important climate and environment change in the source and/ or deposition regions (Pye, 1995).…”

Section: Onset Of Dust Accumulation In the Lryr And Its Environmental Significancementioning

confidence: 90%

Provenance and Climatic Implications of the Middle-Pleistocene Loess Deposit, Southern China

Fan

Liao

et al. 2021

Front. Earth Sci.

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The middle-Pleistocene Xiashu loess deposit in the lower reaches of the Yangtze River (LRYR), southern China, may yield evidence with significant climatic and environmental significance. However, its provenance remains controversial. In this study, grain size analysis, and quartz grain surface microtextural and morphological observations, enabled comparison of the provenance of loess in the LRYR with those on the Loess Plateau in northern China. The results show that the grain size characteristics of the Xiashu loess do not follow the coarse-fine NW-SE trend in northern China, and the surface microtextures of the quartz grains in the Xiashu loess are distinctly different from those on the Loess Plateau in northern China, indicating that the loess deposits in the two regions have different provenances. The Gobi Desert in inland northwestern China are not considered as the primary provenance of the Xiashu loess. Instead, the adjacent floodplains in the LRYR, the alluvial plains of the Huai River and the Yellow River to the north during glacial periods are suggested as the dominant source materials for the Xiashu loess. Under the background of middle-Pleistocene climate transition (MPT), regional aridity and a strengthened east Asian winter monsoon (driven by global cooling and the rapid uplift of the Tibetan Plateau) were considered as the primary drivers for the development of the Xiashu loess. The sustained eolian loess accumulation represent a regional response of the northern subtropical area of southern China to the MPT global cooling event at around 0.9 Ma.

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“…Te primary minerals are mainly quartz and feldspar, and the clay minerals are mainly illite. Tere are many theories about its genesis [1][2][3][4] and formation [5,6], but the eolian theory has gradually dominated and been accepted by most researchers. Xiashu loess has signifcant water sensitivity [7][8][9] and weak expansion [10].…”

Section: Introductionmentioning

confidence: 99%

Study on Influence of Moisture Content on Strength and Brittle-Plastic Failure Characteristics of Xiashu Loess

Sun

2023

Advances in Civil Engineering

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To reveal the influence of water content on the strength characteristics and brittle-plastic failure process of Xiashu loess, the direct shear test and unconfined compressive strength test of Xiashu loess with different water content were carried out, and the influence of water content on its strength characteristics and brittle-plastic failure transformation characteristics was studied. Eight kinds of Xiashu loess with different moisture contents were designed, and a direct shear test and uniaxial compression test were carried out, respectively. The results show that with the increase in water content, the shear strength and unconfined compressive strength of Xiashu loess decrease continuously. The influence of water content on cohesion in the shear strength index is greater than that of the internal friction angle. The relationship curve between cohesion and internal friction angle and water content shows obvious segmentation. When approaching the optimal water content, the downward trend is slowed down. When the water content is constant, the shear strength of the sample will also increase with the increase of normal stress. When the water content is 12% to 15%, the failure mode of Xiashu loess is a brittle failure, and the unconfined compressive strength decreases by 43.23%. When the water content is 15% to 16%, the failure mode of Xiashu loess is a transitional failure, and the unconfined compressive strength decreases by 60.38%. When the water content is greater than 16%, Xiashu loess shows plastic failure, and the unconfined compressive strength decreases slightly.

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Distribution, provenance, and onset of the Xiashu Loess in Southeast China with paleoclimatic implications

Cited by 37 publications

References 54 publications

Expansion of Dust Provenance and Aridification of Asia Since ~7.2 Ma Revealed by Detrital Zircon U‐Pb Dating

Expansion of Dust Provenance and Aridification of Asia Since ~7.2 Ma Revealed by Detrital Zircon U‐Pb Dating

Provenance and Climatic Implications of the Middle-Pleistocene Loess Deposit, Southern China

Study on Influence of Moisture Content on Strength and Brittle-Plastic Failure Characteristics of Xiashu Loess

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