Hf-Nd isotopic variability in mineral dust from Chinese and Mongolian deserts: implications for sources and dispersal

Zhao, Wancang; Sun, Youbin; Balsam, William; Lu, Huayu; Liu, Lianwen; Chen, Jun; Ji, Junfeng

doi:10.1038/srep05837

Cited by 59 publications

(90 citation statements)

References 59 publications

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“…Sun et al, 2000;Ding et al, 2002;Gallet et al, 1996). While these methods can still provide valuable insights into source via analysis of potential mixing lines in data (Zhao et al, 2014), they have the disadvantage of averaging out multiple distinct sediment source signatures. As such, more recent studies have used single-grain approaches such as detrital zircon U-Pb geochronology on Chinese Plateau Loess (Stevens et al, 2010(Stevens et al, , 2013bPullen et al, 2011;Che & Li 2013;Xiao et al, 2012;Nie et al, 2014) and loess deposits elsewhere (e.g.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Quaternary dust source variation across the Chinese Loess Plateau

Bird

Stevens

Rittner

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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106

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The Chinese Loess Plateau in north central China contains one of the most valuable Cenozoic climate archives on land. Establishing the origin of this substantial archive of aeolian sediments is critical for the interpretation of loess climate proxies, past atmospheric wind patterns and changing climatic/tectonic controls on erosion over potentially the past 25 Ma. Despite this significance there are a number of disagreements over the precise source areas and the extent to which these vary through time and across the plateau. To address this, we utilize a multi-technique, approach of combined detrital singlegrain zircon U-Pb dating and heavy mineral analysis to establish the sources of loess through the Quaternary and constrain their variation geographically across the Loess Plateau. We combine our data with suitable published single-grain datasets from loess and possible source regions. The results

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Section: Accepted Manuscriptmentioning

confidence: 99%

Quaternary dust source variation across the Chinese Loess Plateau

Bird

Stevens

Rittner

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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106

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“…Provenance studies using both using Nd-Sr isotopic composition (Chen and Li, 2011;Zhao et al, 2014) and detrital zircon U-Pb age analyses (Xie et al, 2012) have demonstrated that the major source areas of the loess deposits in NE China are likely to be the upwind Horqin and Otindag sandy deserts. Therefore, the loess and adjacent sandy deserts Catena 154 (2017) [21][22][23][24][25][26][27][28][29][30][31][32] in NE China can be regarded as a coupled system, with dust source and sink formed under a semi-arid climate, which is quite distinct from the loess deposits of the CLP and their corresponding sources areas in northwestern and central China.…”

Section: Introductionmentioning

confidence: 99%

Long-term Pleistocene aridification and possible linkage to high-latitude forcing: New evidence from grain size and magnetic susceptibility proxies from loess-paleosol record in northeastern China

Zeng

et al. 2017

CATENA

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Loess deposits are regarded as good indicators of the inception and development of arid and semi-arid climate in central Asia and northern China during the late Cenozoic. In northeastern China extensive loess deposits are found surrounding the Horqin and Otindag sand fields, and they have great potential for reconstructing the long-term aridification history of the region. However, these loess deposits are currently poorly understood.Here, we present a high-resolution magnetic susceptibility (MS) and grain-size record spanning the last 1.0 Ma from a 36.6-m-thick loess-paleosol sequence at Niuyangzigou site (NYZG) in NE China. The grain-size record reveals a long-term drying trend in NE China since ca. 1.0 Ma, punctuated by two significant abrupt drying events at~0.65 Ma and~0.3 Ma. These results demonstrate a process of stepwise intensification of drying in NE China over the past 1 Ma, and lend support to the hypothesis that global ice volume/temperature changes were the major driver of the long-term aridification of Asian dust source areas. However, unlike the widely studied loess deposits on the central Chinese Loess Plateau (CLP), the MS record in paleosol units S1, S2 and S4 from the NYZG site do not show evidence of enhanced monsoon precipitation resulting from decreased global ice volume and the prolonged episodes of interglaciation after the Mid-Pleistocene Transition evident in the ice volume record. We hypothesize that this may be due to differences in the climatic sensitivity of the MS of Chinese loess deposits on a regional scale, rather than to in regional differences in monsoon intensity.

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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%

“…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%

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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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Hf-Nd isotopic variability in mineral dust from Chinese and Mongolian deserts: implications for sources and dispersal

Cited by 59 publications

References 59 publications

Quaternary dust source variation across the Chinese Loess Plateau

Quaternary dust source variation across the Chinese Loess Plateau

Long-term Pleistocene aridification and possible linkage to high-latitude forcing: New evidence from grain size and magnetic susceptibility proxies from loess-paleosol record in northeastern China

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

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