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Extreme lithium isotopic fractionation in three zircon standards (Plešovice, Qinghu and Temora)

To understand the behavior of Li in zircon, we have analyzed the abundance and isotopic composition of Li in three zircon standards (Plešovice, Qinghu and Temora) widely used for microbeam analysis of U-Pb ages and O-Hf isotopes. We have mapped Li concentration ([Li]) on large grains, using a Cameca...

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Autores principales: Gao, Yu-Ya, Li, Xian-Hua, Griffin, William L., Tang, Yan-Jie, Pearson, Norman J., Liu, Yu, Chu, Mei-Fei, Li, Qiu-Li, Tang, Guo-Qiang, O’Reilly, Suzanne Y.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4655365/
https://www.ncbi.nlm.nih.gov/pubmed/26594042
http://dx.doi.org/10.1038/srep16878
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author Gao, Yu-Ya
Li, Xian-Hua
Griffin, William L.
Tang, Yan-Jie
Pearson, Norman J.
Liu, Yu
Chu, Mei-Fei
Li, Qiu-Li
Tang, Guo-Qiang
O’Reilly, Suzanne Y.
author_facet Gao, Yu-Ya
Li, Xian-Hua
Griffin, William L.
Tang, Yan-Jie
Pearson, Norman J.
Liu, Yu
Chu, Mei-Fei
Li, Qiu-Li
Tang, Guo-Qiang
O’Reilly, Suzanne Y.
author_sort Gao, Yu-Ya
collection PubMed
description To understand the behavior of Li in zircon, we have analyzed the abundance and isotopic composition of Li in three zircon standards (Plešovice, Qinghu and Temora) widely used for microbeam analysis of U-Pb ages and O-Hf isotopes. We have mapped Li concentration ([Li]) on large grains, using a Cameca 1280HR Secondary Ion Mass Spectrometer (SIMS). All zircons have a rim 5–20 μm wide in which [Li] is 5 to 20 times higher than in the core. Up to ~20‰ isotopic fractionation is observed on a small scale in the rims of a single zircon grain. The measured δ(7)Li values range from –14.3 to 3.7‰ for Plešovice, –22.8 to 1.4‰ for Qinghu and –4.7 to 16.1‰ for Temora zircon. The [Li] and δ(7)Li are highly variable at the rims, but relatively homogenous in the cores of the grains. From zircon rim to core, [Li] decreases rapidly, while δ(7)Li increases, suggesting that the large isotopic variation of Li in zircons could be caused by diffusion. Our data demonstrate that homogeneous δ(7)Li in the cores of zircon can retain the original isotopic signatures of the magmas, while the bulk analysis of Li isotopes in mineral separates and in bulk-rock samples may produce misleading data.
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spelling pubmed-46553652015-11-27 Extreme lithium isotopic fractionation in three zircon standards (Plešovice, Qinghu and Temora) Gao, Yu-Ya Li, Xian-Hua Griffin, William L. Tang, Yan-Jie Pearson, Norman J. Liu, Yu Chu, Mei-Fei Li, Qiu-Li Tang, Guo-Qiang O’Reilly, Suzanne Y. Sci Rep Article To understand the behavior of Li in zircon, we have analyzed the abundance and isotopic composition of Li in three zircon standards (Plešovice, Qinghu and Temora) widely used for microbeam analysis of U-Pb ages and O-Hf isotopes. We have mapped Li concentration ([Li]) on large grains, using a Cameca 1280HR Secondary Ion Mass Spectrometer (SIMS). All zircons have a rim 5–20 μm wide in which [Li] is 5 to 20 times higher than in the core. Up to ~20‰ isotopic fractionation is observed on a small scale in the rims of a single zircon grain. The measured δ(7)Li values range from –14.3 to 3.7‰ for Plešovice, –22.8 to 1.4‰ for Qinghu and –4.7 to 16.1‰ for Temora zircon. The [Li] and δ(7)Li are highly variable at the rims, but relatively homogenous in the cores of the grains. From zircon rim to core, [Li] decreases rapidly, while δ(7)Li increases, suggesting that the large isotopic variation of Li in zircons could be caused by diffusion. Our data demonstrate that homogeneous δ(7)Li in the cores of zircon can retain the original isotopic signatures of the magmas, while the bulk analysis of Li isotopes in mineral separates and in bulk-rock samples may produce misleading data. Nature Publishing Group 2015-11-23 /pmc/articles/PMC4655365/ /pubmed/26594042 http://dx.doi.org/10.1038/srep16878 Text en Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Gao, Yu-Ya
Li, Xian-Hua
Griffin, William L.
Tang, Yan-Jie
Pearson, Norman J.
Liu, Yu
Chu, Mei-Fei
Li, Qiu-Li
Tang, Guo-Qiang
O’Reilly, Suzanne Y.
Extreme lithium isotopic fractionation in three zircon standards (Plešovice, Qinghu and Temora)
title Extreme lithium isotopic fractionation in three zircon standards (Plešovice, Qinghu and Temora)
title_full Extreme lithium isotopic fractionation in three zircon standards (Plešovice, Qinghu and Temora)
title_fullStr Extreme lithium isotopic fractionation in three zircon standards (Plešovice, Qinghu and Temora)
title_full_unstemmed Extreme lithium isotopic fractionation in three zircon standards (Plešovice, Qinghu and Temora)
title_short Extreme lithium isotopic fractionation in three zircon standards (Plešovice, Qinghu and Temora)
title_sort extreme lithium isotopic fractionation in three zircon standards (plešovice, qinghu and temora)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4655365/
https://www.ncbi.nlm.nih.gov/pubmed/26594042
http://dx.doi.org/10.1038/srep16878
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