Spatiotemporal variations of Zr/Rb ratio in three last interglacial paleosol profiles across the Chinese Loess Plateau and its implications for climatic interpretation

Wang, Haibin; Liu, Lianyou; Feng, Zhenzhen

doi:10.1007/s11434-008-0068-0

Cited by 17 publications

(9 citation statements)

References 36 publications

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“…The chemical elemental compositions and concentrations in sediments are governed by the physical and chemical propertiesofthe sediment(parentmaterial) and byclimate changes (Jin et al 2006;Xiong et al 2010;Chang et al 2013;Liu et al 2014). Moreover, climate changes mainly affect the migration and enrichment of chemical elements (Wang et al 2008). In this study, calcareous sheaths and rhizocretions are both distributed in the same place in most sampling sites; hence, the two CRTs have the same parent material, resulting in a consistent elemental composition.…”

Section: Elemental Differences Between Calcareous Sheaths and Rhizocrmentioning

confidence: 72%

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Variations in chemical element compositions in different types of Holocene calcareous root tubes in the Tengger Desert, NW China, and their palaeoenvironmental significance

Zhu

Gao

et al. 2019

Boreas

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Calcareous root tubes (CRTs) contain abundant information about palaeoenvironmental conditions and have been used for palaeoenvironmental studies in the desert hinterlands of arid regions. However, as subclasses of CRTs, calcareous sheaths and rhizocretions are formed by different processes, and it remains unclear whether these differences produce variations in the chemical element composition. Furthermore, it remains uncertain whether variations in chemical element concentrations amongst different subclasses of the CRTs can affect palaeoenvironmental reconstructions. In this study, we collected 54 CRT samples from the Tengger Desert of northwestern China. All samples were dated by accelerator mass spectrometry (AMS) 14C dating, and the chemical element composition and concentration differences of the two CRT subclasses were determined using X‐ray fluorescence spectrometry. The CRT samples were dated to the Holocene. The calcareous sheath and rhizocretion samples contained varying concentrations of the same chemical elements. The rhizocretions had high concentrations of mobile elements (Ca, Mg and Sr) and P, whereas the calcareous sheaths had high concentrations of stable elements, including Al, Si, Ti, Zr, Rb and Ba. These differences were due to the different formation processes of the two subclasses of CRTs. Moreover, the Sr/Ca and Mg/Ca ratios in the calcareous sheaths were higher than those in the rhizocretions from the same period, but these ratio differences had little effect on palaeo‐effective moisture reconstructions at the millennial scale during the Holocene. The reconstructions were not influenced by the various CRT subclasses. The Holocene millennial‐scale moisture changes in the Tengger Desert revealed by the Sr/Ca and Mg/Ca ratios showed that there was an arid period during the Early Holocene, a humid period during the Middle Holocene and a humid to arid period during the Late Holocene.

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Section: Elemental Differences Between Calcareous Sheaths and Rhizocrmentioning

confidence: 72%

“…Moreover, climate changes mainly affect the migration and enrichment of chemical elements (Wang et al . ). In this study, calcareous sheaths and rhizocretions are both distributed in the same place in most sampling sites; hence, the two CRTs have the same parent material, resulting in a consistent elemental composition.…”

Section: Discussionmentioning

confidence: 97%

Variations in chemical element compositions in different types of Holocene calcareous root tubes in the Tengger Desert, NW China, and their palaeoenvironmental significance

Zhu

Gao

et al. 2019

Boreas

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“…Magnetic susceptibility is regarded as a proxy for the Asian Summer Monsoon strength in the Loess Plateau of China (An et al, 1993), as shifts in the monsoon change pedogenesis processes, which then impact MS (Lu et al, 1994). Zr/Rb is a reliable proxy for the winter monsoon intensity as it is rarely affected by weathering and is closely related to loess and soil transportation (Wang et al, 2008). However, when the CIA is more than 65, Zr/Rb may be affected by pedogenesis (Wang et al, 2008).…”

Section: Climate Change Recorded By Multi-proxy Analysis Of the Changmentioning

confidence: 99%

Mid-Holocene climate change and its effect on prehistoric cultural evolution in eastern Qinghai Province, China

Dong

Jia

et al. 2012

Quat. res.

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We studied the mid-Holocene climate change in eastern Qinghai Province, China and its impact on the evolution of Majiayao (3980–2050 BC) and Qijia (2183–1635 BC) cultures, near the important Neolithic site of Changning. The investigation focused on analyses of grain size, magnetic susceptibility, ratios of elemental contents, and pollen assemblage from a loess-paleosol sequence. The results indicate that the climate was wet during 5830–4900 cal yr BP, which promoted the development of early-mid Majiayao culture in eastern Qinghai Province. However, 4900–4700 cal yr BP were drought years in the region, responsible for the decline and eastward movement of prehistoric culture during the period of transition from early-mid to late Majiayao culture. The climate turned wet again during 4700–3940 cal yr BP, which accelerated the spread of Qijia culture to the middle reaches of the Huangshui River, including the Changning site.

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“…The low enrichment coefficients of Rb, Ba, Ti, and Zr could also demonstrate their inactivity. Therefore, the four inactive elements discussed above could preserve the elemental information of parent material, without being subject to chemical weathering changes (Hodson, 2002; Wang et al, 2008). The results of cluster analysis suggested that the contents of Rb, Ba, Ti, and Zr were different in the first three CRT clusters, which indicated that the parent material from which those samples formed had variable elemental contents.…”

Section: Discussionmentioning

confidence: 99%

Controlling factors and the paleoenvironmental significance of chemical elements in Holocene calcareous root tubes in the Alashan Desert, Northwest China

Gao

Wang

et al. 2018

Quat. res.

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In the hinterland of the desert, valuable archives of paleoenvironmental evolution are scarce. Calcareous root tubes (CRTs) have a strong potential for reconstructing paleoenvironmental conditions. It is still unclear, however, whether chemical elements in the CRTs can provide insights into paleoenvironmental conditions. In this study, the major- and trace-element composition of 32 CRT samples from the Alashan Desert were analyzed by X-ray fluorescence spectrometry. Results showed that the elemental composition and content change were controlled by the parent material and climatic conditions at the time of CRT formation. Ca, Mg, and Sr were significantly affected by climate, whereas the enrichment of P is likely related to the growth of plants. Higher (lower) Mg/Ca and Sr/Ca ratios corresponded to higher (lower) effective moisture and a higher (lower) Mg/Sr ratio indicated a higher (lower) temperature during the middle Holocene (8–5 cal ka BP). The reconstruction results for effective moisture were consistent with those in the Asian monsoon margin of northwestern China, which were caused by higher monsoon precipitation and lower evaporation. Therefore, chemical elements in the CRTs can reflect changes in paleo-effective moisture and paleotemperature at a millennial resolution in this area.

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Spatiotemporal variations of Zr/Rb ratio in three last interglacial paleosol profiles across the Chinese Loess Plateau and its implications for climatic interpretation

Cited by 17 publications

References 36 publications

Variations in chemical element compositions in different types of Holocene calcareous root tubes in the Tengger Desert, NW China, and their palaeoenvironmental significance

Variations in chemical element compositions in different types of Holocene calcareous root tubes in the Tengger Desert, NW China, and their palaeoenvironmental significance

Mid-Holocene climate change and its effect on prehistoric cultural evolution in eastern Qinghai Province, China

Controlling factors and the paleoenvironmental significance of chemical elements in Holocene calcareous root tubes in the Alashan Desert, Northwest China

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