Paleoclimatic evolution indicated by major geochemical elements from aeolian sediments on the east of Qinghai Lake

Shang, Yuan; Ruijie, Lu; Jia, Feifei; Tian, Lihui; Qingliang, Tang; Yuan, Chen; Zhao, Chao; Wu, Wangyang

doi:10.3724/sp.j.1226.2013.00301

Cited by 3 publications

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“…Wang et al (2015) reconstructed the palaeotemperature of the Lake Qinghai using long chain alkenones, exhibits 10.4 ka and 8.8 ka rapid climate changes. Besides lake sediments, aeolian sand and loess surrounding Lake Qinghai areas also record the rapid climate change during the Holocene (Lu et al, 2010;Liu et al, 2012;Shang et al, 2013;E et al, 2015;Lu et al, 2015;Ding et al, 2019;E et al, 2019;Yang et al, 2019). For example, the eastern sandy land of the Lake Qinghai has obvious response to 9.4 ka, 8.2 ka and 4 ka cold events (Liu, 2013;Lv, 2018).…”

Section: Introductionmentioning

confidence: 99%

Rapid environmental changes in the Lake Qinghai basin during the late Holocene

Wang,

Qiu,

Fan

et al. 2023

Front. Earth Sci.

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The Lake Qinghai Basin is sensitive to global and regional climate change because of its unique geographical location. It is the hotspot for paleoclimate research in East Asia. In this study, we reconstructed the environmental evolution of the Lake Qinghai since ∼9 ka by using a high-resolution peat and fluvial-lacustrine record (Laoyinggou profile) obtained at the foot of Nanshan Mountain. Based on 8 AMS14C dates and lithology, loss on ignition (LOI), total organic matter (TOC), X-ray fluorescence (XRF) core-scanning measurements, ratio of total organic carbon to nitrogen (TOC/TN), and sediment particle sorting coefficients, we show that during the Middle Holocene (∼9–4.4 ka BP) this region was primarily dominated by the Asian summer monsoon, with a consistent, warm, and humid environment. By contrast, during the late Holocene (4.4 ka to present), the climatic context in this area fluctuated dramatically at the millennial scales. The low TOC content, lower TOC/TN ration and strong hydroclimatic indicate six rapid climate change events, which occurred at ∼4.0 ka, ∼3.6 ka, ∼3.2 ka, ∼2.8 ka, ∼2.1 ka, and ∼1.4 ka, all of which coincided to cold episodes in the North Atlantic Ocean.

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Section: Introductionmentioning

confidence: 99%

Rapid environmental changes in the Lake Qinghai basin during the late Holocene

Wang,

Qiu,

Fan

et al. 2023

Front. Earth Sci.

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Environmental Significance of the Chemical Composition of Sediments in Groundwater‐Recharged Lakes of the Badain Jaran Desert, NW China

Chen

Zou

et al. 2019

Geochem Geophys Geosyst

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For lakes in desert hinterlands that are not recharged by river runoff, sediment is input solely by wind transport; however, the mechanisms that control the spatial variations in geochemical characteristics of sediments in such lakes remain unclear. Moreover, it remains uncertain whether some element ratios can be used as proxies for environmental characteristics. In this study, 100 surface sediment samples were collected from five lakes in the hinterland of the Badain Jaran Desert, NW China, and examined for their major, trace and rare earth element contents and mineral assemblages. Chemical composition and mineral components of the sediments differed significantly between lakes with different total dissolved solids (TDS). Geochemical characteristics of the lake sediments and their spatial variations are influenced by eolian sands, saline minerals, and sediment sorting. Eolian sands dominate the immobile and nonsoluble elements, whereas authigenic minerals are important in influencing variations in the mobile and soluble elements. Sediment sorting is reflected in the spatial variation of the sediment chemical composition. The positive relationship between the SiO 2 /Ti of sediment and lake area indicates that changes in the SiO 2 /Ti ratio can reveal approximate lake area. The Na 2 O/K 2 O ratio in sediments can reveal the TDS of salt lakes more effectively than can the Rb/Sr ratio. However, the key factors and mechanisms governing the chemical composition of sediments at different brine evolution stages vary among lakes with different TDS levels, which should be carefully considered when interpreting the environmental significance of the chemical composition as a proxy for paleoenviroment change.

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Geochemical Composition of Surface Sediments in the Bashang Area, North China and its Environmental Significance

et al. 2022

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The geochemical characteristics of sediments are important for reconstructing paleoclimatic and paleoenvironmental conditions in the Asian summer monsoon marginal area. However, robust reconstructions require an understanding of the key factors and mechanisms governing the spatial variations in the composition and ratio of chemical elements in the modern sediments of the Asian summer monsoon marginal area. In this study, 128 surface sediment samples were collected from the Bashang area, which is situated in the Asian summer monsoon marginal area, and examined for their major and trace element compositions and grain size. Principal component analysis (PCA) and redundancy analysis (RDA) were used to analyse the relationship between geochemical data and modern temperature and precipitation data. The results showed that the CIA values of sediments in the Bashang area are mainly affected by temperature rather than precipitation and the Rb/Sr value in the study area reflects the level of precipitation in the corresponding period and the temperature controlling the leaching and weathering. In addition, SiO2/Al2O3 and Zr/Ti ratios have good positive relationships with the coarse-grained fraction of sediments and thus can be used as grain size proxies. We propose that the exact environmental significance indicated by these proxies should be stated explicitly before using them as proxies for paleoenvironmental reconstructions of the Asian summer monsoon marginal area.

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Paleoclimatic evolution indicated by major geochemical elements from aeolian sediments on the east of Qinghai Lake

Cited by 3 publications

References 0 publications

Rapid environmental changes in the Lake Qinghai basin during the late Holocene

Rapid environmental changes in the Lake Qinghai basin during the late Holocene

Environmental Significance of the Chemical Composition of Sediments in Groundwater‐Recharged Lakes of the Badain Jaran Desert, NW China

Geochemical Composition of Surface Sediments in the Bashang Area, North China and its Environmental Significance

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