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A global assessment of copper, zinc, and lead isotopes in mineral dust sources and aerosols

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Title: A global assessment of copper, zinc, and lead isotopes in mineral dust sources and aerosols
Authors: Schleicher, NJ
Dong, S
Packman, H
Little, SH
Ochoa Gonzalez, R
Najorka, J
Sun, Y
Weiss, DJ
Item Type: Journal Article
Abstract: The stable isotope compositions of Cu and Zn in major geochemical reservoirs are increasingly studied with the aim to develop these isotope systems as tools to investigate the global biogeochemical cycles of these trace metals. The objectives of the present study were (i) to expand the range of Cu, Zn, and Pb isotope compositions of mineral dust by analyzing samples from major mineral dust sources in Asia and Africa (Chinese Loess Plateau, Chinese deserts, Thar desert, Sahel region) and (ii) to assess the potential impact of human activities on the isotope composition of aerosols by synthesizing published Cu and Zn isotope compositions in aerosols and natural and anthropogenic sources. For the newly analyzed mineral dust areas in Asia and Africa, δ65CuNIST−976 values range from −0.54 to +0.52‰, δ66ZnJMC−Lyon values from −0.07 to +0.57‰, and 206Pb/204Pb values from 18.522 to 19.696. We find a significant geographic control with samples from the Thar Desert having the heaviest isotopic compositions (δ65CuNIST−976 = +0.48 ± 0.06‰, δ66ZnJMC−Lyon = +0.49 ± 0.11‰) and samples from the Sahel and the Badain Jaran desert having the lightest Zn isotope composition (δ66ZnJMC−Lyon = +0.19 ± 0.15‰ and +0.07 ± 0.07‰, respectively). We find important variations in the isotope signatures between particle size fractions with heavier isotopic compositions in the smallest and largest particle size fractions and lighter isotopic compositions in the mid particle size fractions. Associations with the mineralogical composition are less clear. Newly analyzed aerosol samples for Beijing and Xi'an show δ65CuNIST−976 values of +0.29 ± 0.19‰ and +0.16 ± 0.04‰, δ66ZnJMC−Lyon values of −0.36 ± 0.04‰ and +0.02 ± 0.06‰, and 206Pb/204Pb values of 18.129 ± 0.003 and 18.031 ± 0.003, respectively. Based on a synthesis of published and novel data, we suggest improved ranges and mean values for the isotopic composition of mineral dust from selected locations in Asia and Africa and of anthropogenic sources such as non-exhaust traffic emissions, combustion, electroplating and galvanization. This should serve as a valuable reference for future studies using these isotope systems. This paper demonstrates univocally that human activity introduces a wide range of Zn isotope compositions into the atmospheric environment and, thus, impacts the biogeochemical cycle of Zn.
Issue Date: Jun-2020
Date of Acceptance: 30-Apr-2020
URI: http://hdl.handle.net/10044/1/80583
DOI: 10.3389/feart.2020.00167
ISSN: 2296-6463
Publisher: Frontiers Media
Start Page: 1
End Page: 20
Journal / Book Title: Frontiers in Earth Science
Volume: 8
Copyright Statement: © 2020 Schleicher, Dong, Packman, Little, Ochoa Gonzalez, Najorka, Sun and Weiss. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY) (http://creativecommons.org/licenses/by/4.0/). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Sponsor/Funder: Commission of the European Communities
Funder's Grant Number: PIEF-GA-2012-329878
Keywords: 0403 Geology
0404 Geophysics
0406 Physical Geography and Environmental Geoscience
Publication Status: Published
Open Access location: https://www.frontiersin.org/articles/10.3389/feart.2020.00167/full
Article Number: 167
Online Publication Date: 2020-06-12
Appears in Collections:Earth Science and Engineering
Grantham Institute for Climate Change