Monte Carlo simulation results of zircon depletion effects on Hf isotopic compositions of dust
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 compo...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.884461 2023-05-15T16:30:05+02:00 Monte Carlo simulation results of zircon depletion effects on Hf isotopic compositions of dust Ujvari, Gabor Wegner, Wencke Klötzli, Urs Horschinegg, Monika Hippler, Dorothee 2017-12-28 application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, 622.8 kBytes https://doi.pangaea.de/10.1594/PANGAEA.884461 https://doi.org/10.1594/PANGAEA.884461 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.884461 https://doi.org/10.1594/PANGAEA.884461 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Ujvari, Gabor; Wegner, Wencke; Klötzli, Urs; Horschinegg, Monika; Hippler, Dorothee (2018): Sr-Nd-Hf Isotopic Analysis of <10 mg Dust Samples: Implications for Ice Core Dust Source Fingerprinting. Geochemistry, Geophysics, Geosystems, 19(1), 60-72, https://doi.org/10.1002/2017GC007136 Dataset 2017 ftpangaea https://doi.org/10.1594/PANGAEA.884461 https://doi.org/10.1002/2017GC007136 2023-01-20T09:10:06Z 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 5-10 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 epsilon-Nd(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 towards 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, epsilon-Hf(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. Dataset Greenland Greenland ice cores PANGAEA - Data Publisher for Earth & Environmental Science Greenland |
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Open Polar |
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PANGAEA - Data Publisher for Earth & Environmental Science |
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ftpangaea |
language |
English |
description |
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 5-10 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 epsilon-Nd(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 towards 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, epsilon-Hf(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. |
format |
Dataset |
author |
Ujvari, Gabor Wegner, Wencke Klötzli, Urs Horschinegg, Monika Hippler, Dorothee |
spellingShingle |
Ujvari, Gabor Wegner, Wencke Klötzli, Urs Horschinegg, Monika Hippler, Dorothee Monte Carlo simulation results of zircon depletion effects on Hf isotopic compositions of dust |
author_facet |
Ujvari, Gabor Wegner, Wencke Klötzli, Urs Horschinegg, Monika Hippler, Dorothee |
author_sort |
Ujvari, Gabor |
title |
Monte Carlo simulation results of zircon depletion effects on Hf isotopic compositions of dust |
title_short |
Monte Carlo simulation results of zircon depletion effects on Hf isotopic compositions of dust |
title_full |
Monte Carlo simulation results of zircon depletion effects on Hf isotopic compositions of dust |
title_fullStr |
Monte Carlo simulation results of zircon depletion effects on Hf isotopic compositions of dust |
title_full_unstemmed |
Monte Carlo simulation results of zircon depletion effects on Hf isotopic compositions of dust |
title_sort |
monte carlo simulation results of zircon depletion effects on hf isotopic compositions of dust |
publisher |
PANGAEA |
publishDate |
2017 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.884461 https://doi.org/10.1594/PANGAEA.884461 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice cores |
genre_facet |
Greenland Greenland ice cores |
op_source |
Supplement to: Ujvari, Gabor; Wegner, Wencke; Klötzli, Urs; Horschinegg, Monika; Hippler, Dorothee (2018): Sr-Nd-Hf Isotopic Analysis of <10 mg Dust Samples: Implications for Ice Core Dust Source Fingerprinting. Geochemistry, Geophysics, Geosystems, 19(1), 60-72, https://doi.org/10.1002/2017GC007136 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.884461 https://doi.org/10.1594/PANGAEA.884461 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.884461 https://doi.org/10.1002/2017GC007136 |
_version_ |
1766019801818333184 |