Clay‐sized Hf‐Nd‐Sr isotopic composition of Mongolian dust as a fingerprint for regional to hemispherical transport

Zhao, Wancang; Sun, Youbin; Balsam, William; Zeng, Lin; Lu, Huayu; Khureldavaa, O; Ji, Junfeng

doi:10.1002/2015gl064357

Cited by 59 publications

(54 citation statements)

References 62 publications

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“…The Sr‐Nd isotopic compositions of dust from the Miaoergou ice core and those from other central Asia regions are reported in Figure S4 and Text S1. [ Chen et al ., ; Rao et al ., ; Wu et al ., ; Xu et al ., , ; Zhao et al ., ]. In addition, back trajectory analysis of air masses also indicates that most trajectories at the Miaoergou site originate from the west (Figure ), supporting the Taklimakan provenance of the Miaoergou dust.…”

Section: Resultsmentioning

confidence: 62%

A high‐resolution atmospheric dust record for 1810–2004 A.D. derived from an ice core in eastern Tien Shan, central Asia

et al. 2017

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Centennial‐scale, high‐resolution records of atmospheric dust conditions are rare in the arid and semiarid regions of central Asia, limiting our understanding of the regional climate and environmental changes and their potential driving forces. In this paper, we present an annually resolved atmospheric dust record covering the period of 1810–2004 A.D., reconstructed from an ice core retrieved at 4512 m above sea level from the Miaoergou Glacier in the eastern Tien Shan. The time series of dust flux for the past 195 years shows three periods of relatively low values (i.e., 1810–1829 A.D., 1863–1940 A.D., and 1979–2004 A.D.) and two periods of relatively high values (i.e., 1830–1862 A.D. and 1941–1978 A.D.). Spatial correlation analysis suggests possible regional factors controlling the dust flux, including antecedent summer precipitation, spring soil moisture, and near‐surface wind speed. In addition, the Miaoergou dust flux is closely associated with the winter index of the North Atlantic Oscillation (NAO) over the past two centuries, with high (low) dust periods coinciding with the negative (positive) phases of the NAO. The persistent relationship suggests that the NAO may have been a key driver on dust flux change over the arid regions between the Tien Shan and Kunlun Mountains.

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Section: Resultsmentioning

confidence: 62%

A high‐resolution atmospheric dust record for 1810–2004 A.D. derived from an ice core in eastern Tien Shan, central Asia

et al. 2017

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“…The Hf isotopic tracer has recently been used in dust source fingerprinting for marine sediments (e.g., Pettke et al, ), modern aerosols/soils (Aarons et al, ; Pourmand et al, ; Zhao et al, ) and dust in ice cores (Blakowski et al, ; Lupker et al, ; Újvári et al, ). Hafnium isotopic ratios do not seem to be affected by weak acetic acid applied in this study (Újvári et al, ), which is similar to Nd isotopes.…”

Section: Discussionmentioning

confidence: 99%

“…Hafnium isotopic ratios do not seem to be affected by weak acetic acid applied in this study (Újvári et al, ), which is similar to Nd isotopes. The 176 Hf/ 177 Hf isotopic compositions have an apparent grain size dependence: these are always more radiogenic in the fine fractions of dust/loess than in the bulk samples (Újvári et al, ; Zhao et al, ). Aerosol samples in dust plumes proved also to be more radiogenic in Hf with increasing distance from the source region (Aarons et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Numbers (50, 10, and 5) denote the sample/aliquot sizes in mg (for further details see the Methods section). Isotopic data sources: clay fractions (<2 μm) of desert surface samples (Zhao et al, ); Chinese bulk loess (Chauvel et al, ). The terrestrial, the zircon‐free, the clay‐sized and clay arrays are from Vervoort et al (), Bayon et al (), Zhao et al () and Bayon et al ().…”

Section: Discussionmentioning

confidence: 99%

“…Since the most powerful dust fingerprinting methods, such as REE composition (Ferrat et al, ; Gallet et al, ; Zdanowicz et al, ) and Sr‐Nd‐Pb isotopic analyses (e.g., Grousset & Biscaye, ), are destructive, there is a clear need to establish sequential separation techniques of Sr, Nd, Pb and other REEs to retrieve the most information from small (5–10 mg) dust samples recovered from ice cores. Although Hf isotopes have recently been added as a tool of aerosol/dust source discrimination (Aarons et al, ; Aciego et al, ; Blakowski et al, ; Lupker et al, ; Pettke et al, ; Pourmand et al, ; Újvári et al, ; Zhao et al, ), precise Hf isotopic measurements of small (<10 mg) dust samples are still challenging due to their minute amounts of Hf (on the order of 1–10 ng); these analyses are often compromised by problems that can arise during ion exchange chemistry. Such problems may include high Lu and Yb blanks causing inaccurate interference corrections on 176 Hf (Münker et al, ), insufficient Ti removal leading to reduced Hf transmission in the mass spectrometer (Blichert‐Toft et al, ; Wimpenny et al, ), and high Zr/Hf producing bias on 176 Hf/ 177 Hf ratios (Peters et al, ).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sr‐Nd‐Hf Isotopic Analysis of <10 mg Dust Samples: Implications for Ice Core Dust Source Fingerprinting

Újvári

Wegner

Klötzli

et al. 2018

Geochem Geophys Geosyst

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Combined Sr‐Nd‐Hf isotopic data of two reference materials (AGV‐1/BCR2) and 50, 10, and 5 mg aliquots of carbonate‐free fine grain (<10 μm) separates of three loess samples (Central Europe/NUS, China/BEI, USA/JUD) are presented. Good agreement between measured and reference Sr‐Nd‐Hf isotopic compositions (ICs) demonstrate that robust isotopic ratios can be obtained from 5 to 10 mg size rock samples using the ion exchange/mass spectrometry techniques applied. While 87Sr/86Sr ratios of dust aluminosilicate fractions are affected by even small changes in pretreatments, Nd isotopic ratios are found to be insensitive to acid leaching, grain‐size or weathering effects. However, the Nd isotopic tracer is sometimes inconclusive in dust source fingerprinting (BEI and NUS both close to ɛNd(0) –10). Hafnium isotopic values (<10 μm fractions) are homogenous for NUS, while highly variable for BEI. This heterogeneity and vertical arrays of Hf isotopic data suggest zircon depletion effects toward the clay fractions (<2 μm). Monte Carlo simulations demonstrate that the Hf IC of the dust <10 μm fraction is influenced by both the abundance of zircons present and maturity of crustal rocks supplying this heavy mineral, while the <2 μm fraction is almost unaffected. Thus, ɛHf(0) variations in the clay fraction are largely controlled by the Hf IC of clays/heavy minerals having high Lu/Hf and radiogenic 176Hf/177Hf IC. Future work should be focused on Hf IC of both the <10 and <2 μm fractions of dust from potential source areas to gain more insight into the origin of last glacial dust in Greenland ice cores.

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Two possible source regions for central Greenland last glacial dust

Újvári

Stevens

Svensson

et al. 2015

Geophysical Research Letters

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Dust in Greenland ice cores is used to reconstruct the activity of dust‐emitting regions and atmospheric circulation. However, the source of dust material to Greenland over the last glacial period is the subject of considerable uncertainty. Here we use new clay mineral and <10 µm Sr–Nd isotopic data from a range of Northern Hemisphere loess deposits in possible source regions alongside existing isotopic data to show that these methods cannot discriminate between two competing hypothetical origins for Greenland dust: an East Asian and/or central European source. In contrast, Hf isotopes (<10 µm fraction) of loess samples show considerable differences between the potential source regions. We attribute this to a first‐order clay mineralogy dependence of Hf isotopic signatures in the finest silt/clay fractions, due to absence of zircons. As zircons would also be absent in Greenland dust, this provides a new way to discriminate between hypotheses for Greenland dust sources.

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Clay‐sized Hf‐Nd‐Sr isotopic composition of Mongolian dust as a fingerprint for regional to hemispherical transport

Cited by 59 publications

References 62 publications

A high‐resolution atmospheric dust record for 1810–2004 A.D. derived from an ice core in eastern Tien Shan, central Asia

A high‐resolution atmospheric dust record for 1810–2004 A.D. derived from an ice core in eastern Tien Shan, central Asia

Sr‐Nd‐Hf Isotopic Analysis of <10 mg Dust Samples: Implications for Ice Core Dust Source Fingerprinting

Two possible source regions for central Greenland last glacial dust

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