The Sr and Nd isotopic variations of the Chinese Loess Plateau during the past 7 Ma: Implications for the East Asian winter monsoon and source areas of loess

Wang, Yinxi; Jun, Yang; Chen, Jun; Zhang, Kaijun; Rao, Wenbo

doi:10.1016/j.palaeo.2007.02.010

Cited by 177 publications

(93 citation statements)

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“…In fact, primary carbonate with high Sr content and low Sr isotopic ratio, and primary silicate with low Sr content and high Sr isotopic ratio are two endmembers controlling the range of the Sr isotopic ratios of calcites in eolian deposits. Wang et al (2007) reported that 87 Sr/ 86 Sr ratios of silicates vary from 0.7182 to 0.7234 in the Lingtai profile, which are higher than those of calcites in this study. We suggest that their Sr isotope data can represent Sr isotopic compositions of primary silicates in the Lingtai profile.…”

Section: Influences On Strontium Isotopic Variations Of Calcitescontrasting

confidence: 51%

Strontium isotopic and elemental characteristics of calcites in the eolian dust profile of the Chinese Loess Plateau during the past 7 Ma

et al. 2008

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Strontium isotopic ratios, calcium and strontium contents of calcites in the eolian dust profile during the last 7 Ma at Lingtai were systematically studied. 87 Like Ca contents, Ca/Sr ratios in the Tertiary red clay are close to those in the Quaternary loess. Elemental ratios and contents have different variations from the Sr isotopic ratios of calcites in the Lingtai profile, implying that isotopic ratios were better proxies for climate change than elemental ratios and contents. Primary carbonate and silicate comprised two endmembers determining the range of the Sr isotopic ratios of calcites, and chemical weathering was an inner driver to induce strontium isotopic variations of calcites in the eolian dust profile. Our isotope data indicate that chemical weathering was strongest in the Tertiary red clay, the second in the Quaternary paleosols, and weakest in the Quaternary loess. Strontium isotopic variations of calcites are in a good agreement with pedogenic characteristics in the Lingtai profile, broadly consistent with a proxy of the summer monsoon-Fe 2 O 3 (f)/Fe 2 O 3 (t) ratios, and correlate with variations of Fe 2+ / Fe 3+ ratios in the Lingtai profile and the dust flux in ODP885/886 during the late Cenozoic. Strontium isotopic variations of calcites are different from the magnetic susceptibility records in the Lingtai profile, further demonstrating that magnetic susceptibility of the Tertiary red clay could not reliably indicate the Tertiary summer monsoon.As a result, strontium isotopic characteristics of calcites in the Lingtai profile indicate that the Quaternary summer monsoon had a glacial-interglacial alternation and weakened with large-amplitude oscillations since 0.5 Ma B.P., and also reveal that the Tertiary summer monsoon was more stable and overall stronger than the Quaternary, nevertheless, similar climates to those in the Tertiary probably occurred during a few paleosol developments of the Quaternary.

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Section: Influences On Strontium Isotopic Variations Of Calcitescontrasting

confidence: 51%

Strontium isotopic and elemental characteristics of calcites in the eolian dust profile of the Chinese Loess Plateau during the past 7 Ma

et al. 2008

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“…The major and trace element compositions are given in Table 2 Pb/ 204 Pb = 36.715 ± 0.009. The analytical procedures for Nd, Pb, and Sr isotopic measurements were described in detail by Wang et al (2007). The SrNd-Pb isotopes data are listed in Table 3.…”

Section: Whole-rock Major and Trace Element Geochemistrymentioning

confidence: 99%

Melt evolution of upper mantle peridotites and mafic dikes in the northern ophiolite belt of the western Yarlung Zangbo suture zone (southern Tibet)

et al. 2018

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The Yarlung Zangbo suture zone (YZSZ) in southern Tibet is divided by the Zhongba terrane into two subparallel belts in its western end. The northern belt (NB) is tectonically juxtaposed against an accretionary prism complex and the Gangdese magmatic arc of Eurasia along dextral oblique-slip faults. Peridotite massifs in this belt are intruded by mafic dikes, providing critical geochemical, geochronological, and isotopic information about the melting-melt extraction history of the Tethyan mantle. Peridotites consist of harzburgite and clinopyroxene harzburgite with minor Iherzolite and dunite-chromitite. Dolerite and microgabbro dikes crosscutting these peridotites display U-Pb zircon ages of 128-122 Ma, and show normal mid-oceanic ridge basalt (N-MORB) like rare earth element patterns with negative Nb, Ta, and Ti anomalies, high ε Nd (t) Pb of 37.724-37.845, suggesting that their N-MORB-like mantle source was modified by island arc melts. Slab rollback-induced extension in an arc-trench system along the Eurasian continental margin led to ~7%-12% partial melting of subduction-influenced, spinel lherzolite peridotites, producing dike magmas. The NB peridotite massifs and ophiolites thus represent a suprasubduction zone oceanic lithosphere formed in close proximity to the late Mesozoic active continental margin of Eurasia.

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“…6). Some authors considered ε Nd (0) values of >-9.0 as a result of circum-Pacific volcano (Wang et al, 2007). Nd isotope ratios of eolian deposits in the Chinese Loess Plateau is independent of particle sorting and chemical weathering but only depends on its parent rocks (Rao et al, 2006).…”

Section: Sr-nd Isotopes Of Eolian Sand In the Erdos Desertmentioning

confidence: 99%

“…Here, eolian profiles of the western-central Loess Plateau with relatively constant ε Nd (0) values are taken as examples to be discussed. Sun (2005) chose the 2.5 mol/L HCl leaching residue of <20 µm eolian deposit in Jingchuan profile as their research object, Wang et al (2007) took the 0.5 mol/L HOAc leaching residue of eolian deposit in Lingtai profile as their research object, and Gallet et al (1996) and Jahn et al (2001) bulk sample in Luochuan, Xifeng, Xining and Jixian profiles as theirs. As Fig.…”

Section: Sr-nd Isotopes Of Eolian Sand In the Erdos Desertmentioning

confidence: 99%

“…4), and between those of the former two members: fine-grained materials in potential sources and parent rocks in the Erdos desert. It is possible that the former two members were mixed at some ratio, which gives the result that ε Nd (0) Luochuan profile (Gallet et al, 1996) Xining profile (Jahn et al, 2001) Xifeng profile (Jahn et al, 2001) Jixian profile (Jahn et al, 2001) Lingtai profle (Wang et al, 2007) Jingchuan profile (Sun, 2005) Surface soil of WCLP Surface soil of WCLP Surface soil of ELP Lanzhou loess (Nakai et al, 1993) Luochuan loess (Liu et al, 1994) µm silicate fractions are about 5ε unit higher than those of the >100 µm silicate fractions in the Erdos desert. Furthermore, the influence of potential source areas lying upwind of the Erdos desert on fine-grained materials of this desert decreased gradually from the west to east, leading to a great difference of ε Nd (0) values between the west and east (Fig.…”

Section: The Provenance Of Eolian Sand In the Erdos Desertmentioning

confidence: 99%

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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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The Sr and Nd isotopic variations of the Chinese Loess Plateau during the past 7 Ma: Implications for the East Asian winter monsoon and source areas of loess

Cited by 177 publications

References 66 publications

Strontium isotopic and elemental characteristics of calcites in the eolian dust profile of the Chinese Loess Plateau during the past 7 Ma

Strontium isotopic and elemental characteristics of calcites in the eolian dust profile of the Chinese Loess Plateau during the past 7 Ma

Melt evolution of upper mantle peridotites and mafic dikes in the northern ophiolite belt of the western Yarlung Zangbo suture zone (southern Tibet)

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

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