Temporal variations in Pb isotopes and trace element concentrations within Chinese eolian deposits during the past 8Ma: Implications for provenance change

Sun, Jimin; Zhu, Xiangkun

doi:10.1016/j.epsl.2010.01.001

Cited by 98 publications

(60 citation statements)

References 33 publications

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“…The increasing physical erosion perhaps also induced the increase of eolian flux in North Pacific at 15-10 Ma [30]. As the climate continues cooling, especially with the onset of North Hemisphere glaciation in Quaternary, part of the CAO may also be available for glaciation (Figure 15(a)), and thus the relative CAO contribution may increase, inducing increase of ε Nd value and decrease of 87 Sr/ 86 Sr ratio of loess ( Figure 14) and also possible changes of Pb isotope [44], oxygen isotope of quartz [88] and elemental composition [89]. The intense Quaternary glacial grinding may have induced the dramatic increase of eolian flux in both CLP and North Pacific [12,26,30].…”

Section: Figure 14mentioning

confidence: 95%

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Geochemical studies on the source region of Asian dust

Chen

Gao-jun

2011

Sci. China Earth Sci.

165

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The North China and the neighbouring Mongolia in Asian Interior is characterized by extremely dry climate, resulted in one of the world's major dust emission centres. Deciphering the source region of Asian dust is critical for revealing the mechanism of the dust production, interpreting the paleo-environmental records of eolian deposits, predicting the overall environmental effects of dust, and setting the strategies for the control of contemporary dust storms. This paper summarizes the geochemical methods applied to the source tracing of Asian dust. Nd-Sr isotopes were the most extensively studied source tracer of Asian dust and have been successfully applied in many cases. Geochemistry of detrital monomineral shows great theoretical advantages in source tracing and deserves further studies. The short-range transportation of Chinese loess with direction similar to that of the prevailing near surface wind is revealed. Source tracing also shows that the Asian dust has two ultimate material sources from the northern margin of the Tibetan Plateau and the Central Asian Orogen, which confirms the importance of mountain processes in the production of silt eolian particles. Based on the recent progresses on the source tracing of Asian dust, discussions are expanded on the natural background of Asian dust storms and potential anthropogenic influence, the materials evolution of the source regions of Asian dust and its relationships with climate changes and Tibetan uplift, and the role of Tibetan uplift in the Asian dust system. desert, loess, Asian dust, dust storm, Tibetan Plateau Citation:Chen J, Li G J. Geochemical studies on the source region of Asian dust.

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Section: Figure 14mentioning

confidence: 95%

“…Wind sorting of zircon may potentially affect the Hf isotopic composition of dust. Pb isotopic studies of Asian dust focused on the eolian deposits [8,19,43,44]. It is until recently that the Pb isotope of the materials in PSAs is measured [45].…”

Section: Other Radiogenic Isotopesmentioning

confidence: 99%

Geochemical studies on the source region of Asian dust

Chen

Gao-jun

2011

Sci. China Earth Sci.

165

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“…Comparisons of Pb isotopic composition of Chinese loess with the ice core and marine sediments also assisted establishment of linkage between the provenance of those sediments and the Asian inland regions (Biscaye et al 1997;Jones et al 2000;Pettke et al 2000;Godfrey 2002;Stancin et al 2006;Klemm et al 2007). In addition, the Pb isotopic ratios have been recently demonstrated the relationship of the provenance changes (Sun and Zhu 2010).…”

Section: Introductionmentioning

confidence: 99%

Provenance of Chinese Loess: Evidence from Stable Lead Isotope

Wu¹,

Ho²,

Sun³

et al. 2011

Terr. Atmos. Ocean. Sci.

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Twenty-seven samples of typical loess and paleosol strata collected in nine different regions of the Chinese Loess Plateau (CLP) were fractionated into PM 1.0 , PM 2.5 , PM 10 and Total Suspended Particulates (TSP) (particulate matter with aerodynamic diameters less than 1.0, 2.5, 10 and ~30 μm, respectively) by a resuspension chamber at the Desert Research Institute (DRI; Reno, NV, United States). The amounts and isotope ratios of lead (Pb) were quantified in the loess samples. Our size-segregated analysis demonstrated that the Pb isotopic composition in the loess-paleosol deposits was preserved after grain-size sorting and that therefore the isotope ratio can serve as a proxy for source tracing. A similar pattern of Pb isotope ratios was observed for sediment collected from potential source regions and the loess samples suggested that the Gobi and deserts in southern Mongolia and northern China are major sources for the deposits in the CLP. No significant deviation of Pb isotope amount was found between the nine samples of loess and paleosol strata, implying the stability of loess sources during the glacial and interglacial regime.

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“…Sr-Nd and Pb isotopic compositions have been applied to trace the source area of eolian sediment in East Asia (Feng et al, 2010;Sun and Zhu, 2010;Li et al, 2009;Chen et al, 2007). However, measurements of the Sr-Nd-Pb isotopic compositions of the Neogene eolian deposit in Xining Basin are still uncommon, hindering our understanding of the provenance of eolian deposits in this basin.…”

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confidence: 98%

“…The 238 U-206 Pb and the 235 U-207 Pb decay systems are fundamental in geochronology (Allègre et al, 1995;Compston et al, 1984). Pb isotopes have been used to trace the source area of eolian deposits (Sun and Zhu, 2010;Li, 2007;Biscaye et al, 1997) and drill core (ZK2) sediments from the Yellow River delta (Hu et al, 2012), though the variations of Pb isotopes in different fractions of the eolian deposits show that they have complicated grainsize effects (Feng et al, 2010).…”

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confidence: 99%

Sr-Nd-Pb Isotopic compositions of the Neogene Eolian Deposits in the Xining Basin and Implications for Their Dust Sources

et al. 2015

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The Neogene eolian deposits in the Xining Basin are valuable archive for studying the evolution of the Asian monsoon system and geomorphic processes of Northwest China. The Neogene eolian deposits that paleomagnetically dated at about 14 Ma probably were sourced from the middle and west Qinghai-Tibetan Plateau (QTP) as indicated by elemental compositions and magnetic properties. This study provides the Sr-Nd-Pb isotopic ratios of different sediments (gravels from the river terraces, Neogene eolian deposits and Quaternary loess) in the Xining Basin. The results show that: (1) Sr-Nd isotopic compositions of terrace gravels are different from those of the Neogene and Quaternary eolian deposits, although the Nd isotope ratios of gravel on the 10th terrace (T10) and eolian deposits are similar. (2) Pb isotopic compositions of river gravels are obviously different from the eolian deposits in the Xining Basin. However, Pb isotopic compositions of eolian deposits in the basin are similar to those of eolian deposits in the central Chinese Loess Plateau. (3) Sr-Nd-Pb isotope results indicate that the Neogene eolian deposits in the Xining Basin were probably sourced from remote areas outside of the basin by long-distance transportation. The Qaidam Basin is probably an important source area for the eolian deposits in the Xining Basin. KEY WORDS: eolian deposits, Qinghai-Tibetan Plateau, Sr-Nd-Pb isotope, source area.

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Temporal variations in Pb isotopes and trace element concentrations within Chinese eolian deposits during the past 8Ma: Implications for provenance change

Cited by 98 publications

References 33 publications

Geochemical studies on the source region of Asian dust

Geochemical studies on the source region of Asian dust

Provenance of Chinese Loess: Evidence from Stable Lead Isotope

Sr-Nd-Pb Isotopic compositions of the Neogene Eolian Deposits in the Xining Basin and Implications for Their Dust Sources

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