Mineralogical variation of Sr–Nd isotopic and elemental compositions in loess and desert sand from the central Loess Plateau in China as a provenance tracer of wet and dry deposition in the northwestern Pacific

Yokoo, Yoshiyuki; Nakano, Takanori; Nishikawa, Masataka; Hao, Qing

doi:10.1016/j.chemgeo.2003.11.004

Cited by 201 publications

(147 citation statements)

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“…87 Sr/ 86 Sr, in loess and soils, range from 0.7118 to 0.7148 (average of 0.7136±0.0012), similar to previous studies. Zhang et al (1995) reported 87 Sr/ 86 Sr ratios of 0.7111-0.7154 from rivers around the Taklimakan Desert in northwest China, similar to those measured at both the Huanghe river (Yellow River;0.7111;Palmer and Edmond, 1989), and the Central Loess Plateau (0.7111; Yokoo et al 2004). …”

Section: Characterization Of Potential End-membersmentioning

confidence: 56%

Isotopes as tracers of sources of lead and strontium in aerosols (TSP & PM2.5) in Beijing

Wîdory¹,

Liu²,

Dong³

2010

Atmospheric Environment

107

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Even after its being phased out in gasoline in the late 90's, lead (Pb) is still present at relatively high levels in the atmosphere of Beijing, China (0.10-0.18 μg.m -3 ). Its origin is subject to debate as several distinct sources may contribute to the observed pollution levels. This study proposes to constrain the origin(s) of Pb and strontium (Sr) in aerosols, by coupling both Pb and Sr isotope systematics. The characterisation of the main pollution sources (road traffic, smelters, metal refining plants, coal combustion, cement factories, and soil erosion) shows that they can unambiguously be discriminated by the multi-isotope approach ( 206 Pb/ 204 Pb and 87 Sr/ 86 Sr). The study of total suspended particulates (TSP) and fine particles (PM 2.5 ) from Beijing and its vicinity indicates that both size fractions are controlled by the same sources. Lead isotopes indicate that metal refining plants are the major source of atmospheric lead, followed by thermal power stations and other coal combustion processes. The role of this latter source is confirmed by the study of strontium isotopes. Occasionally, emissions from cement plants and/or input from soil alteration are isotopically detectable.

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Section: Characterization Of Potential End-membersmentioning

confidence: 56%

Isotopes as tracers of sources of lead and strontium in aerosols (TSP & PM2.5) in Beijing

Wîdory¹,

Liu²,

Dong³

2010

Atmospheric Environment

107

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“…Therefore, the stable silicate minerals provide more appropriate research material than bulk dust samples. We treated our samples with 20% hydrochloric acid (HCl) solution at 97°C in a Teflon vessel for 45 minutes (as described by Yokoo et al, 2004). Yokoo et al (2004) Nd values for samples in this work do not appear affected significantly by pretreatment.…”

Section: Methodsmentioning

confidence: 99%

“…We treated our samples with 20% hydrochloric acid (HCl) solution at 97°C in a Teflon vessel for 45 minutes (as described by Yokoo et al, 2004). Yokoo et al (2004) Nd values for samples in this work do not appear affected significantly by pretreatment. The silicate residues were washed four times with super-pure water (18.2 MΩ).…”

Section: Methodsmentioning

confidence: 99%

Grain size effect on Sr and Nd isotopic compositions in eolian dust: Implications for tracing dust provenance and Nd model age

et al. 2009

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Strontium (Sr) and neodymium (Nd) isotopic compositions enable identification of dust sources and reconstruction of atmospheric dispersal pathways. The Sr and Nd isotopic compositions in eolian dust change systematically with grain size in ways not yet fully understood. This study demonstrates the grain size effect on the Sr and Nd isotopic compositions in loess and 2006 dust fall, based on analyses of seven separated grain size fractions. The analytical results indicate that Sr isotopic ratios strongly depend on the grain size fractions in samples from all types of eolian dust. In contrast, the Nd isotopic ratios exhibit little variation in loess, although they vary significantly with grain size in samples from a 2006 dust fall. Furthermore, Nd model ages tend to increase with increasing grain size in samples from all types of eolian dust. Comparatively, Sr isotopic compositions exhibit high sensitively to wind sorting, while Nd isotopic compositions show greater sensitively to dust origin. The principal cause for the different patterns of Sr and Nd isotopic composition variability with grain size appears related to the different geochemical behaviors between rubidium (Rb) and Sr, and the similar geochemical behaviors between samarium (Sm) and Nd. The Nd isotope data indicate that the various grain size fractions in loess have similar origins for each sample. In contrast, various provenance components may separate into different grain size fractions for the studied 2006 dust fall. The Sr and Nd isotope compositions further confirm that the 2006 dust fall and Pleistocene loess in Beijing have different sources. The loess deposits found in Beijing and those found on the Chinese Loess Plateau also derive from different sources. Variations between Sr and Nd isotopic compositions and Nd model ages with grain size need to be considered when directly comparing analyses of eolian dust of different grain size.

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“…So far, several authors such as Liu et al (1994), Yokoo et al (2004) and Nakano et al (2004) simply discussed the relationship between the northern desert and the Chinese Loess Plateau using Sr-Nd isotope geochemistry. As a whole, a detailed and systematic study in this field is necessary.…”

Section: Introductionmentioning

confidence: 99%

Sr-Nd isotopic characteristics of eolian deposits in the Erdos Desert and Chinese Loess Plateau: Implications for their provenances

et al. 2008

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Material sources of the northern deserts and the Loess Plateau in China are always one of the critical focuses in Quaternary and paleoclimate fields. In this paper, the method of Sr-Nd isotope geochemistry is applied to explore the relationship in material source between the Erdos desert and Chinese Loess Plateau. The ε Nd (0) value of the <75 µm silicate fraction between -11.8 and -17.2 is more positive in the west than in the east, and its 87 Sr/ 86 Sr ratio varies from 0.719218 to 0.714824 without similar characteristics in the Erdos desert. In addition, there are Sr-Nd isotopic differences between different grain-size fractions of eolian sand in the Erdos desert. The coarse-grained fractions mainly originated from local parent rock weathering, but the fine-grained fractions were probably affected by the input of foreign materials. Geographical distribution of Sr-Nd isotopes (especially Nd isotopes) of <75 µm silicate fractions indicates that the input of foreign materials into the Erdos desert decreases gradually from its west to east. The ε Nd (0) (0) values of eolian silicate fractions in the western-central Loess Plateau mostly fall in a very narrow range of -9~-11.5, suggesting a uniform source region. However, there is a large Sr isotope variation resulting from different pretreating methods employed by researchers. The ε Nd (0) and 87 Sr/ 86 Sr values of eolian silicate fractions in the eastern Loess Plateau both change markedly. The differences in Sr-Nd isotopes of eolian silicate fractions between the eastern and western-central Loess Plateau indicate that there are different sources for eolian silicate materials in the two sub-areas. Sr-Nd isotopes, especially Nd isotopes of the <75 µm silicate fractions in the Erdos desert are clearly different from those of eolian silicate fractions in the western-central part, but roughly close to those of eolian silicate fractions in the eastern part of the Chinese Loess Plateau, which shows that the Erdos desert was perhaps a main source for the eastern Loess Plateau but not for the western-central Loess Plateau.

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Mineralogical variation of Sr–Nd isotopic and elemental compositions in loess and desert sand from the central Loess Plateau in China as a provenance tracer of wet and dry deposition in the northwestern Pacific

Cited by 201 publications

References 53 publications

Isotopes as tracers of sources of lead and strontium in aerosols (TSP & PM2.5) in Beijing

Isotopes as tracers of sources of lead and strontium in aerosols (TSP & PM2.5) in Beijing

Grain size effect on Sr and Nd isotopic compositions in eolian dust: Implications for tracing dust provenance and Nd model age

Sr-Nd isotopic characteristics of eolian deposits in the Erdos Desert and Chinese Loess Plateau: Implications for their provenances

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