Zinc systematics quantify crustal thickness control on fractionating assemblages of arc magmas

Zinc systematics quantify crustal thickness control on fractionating assemblages of arc magmas

Abstract Understanding the processes leading to the broad chemical variability of arc magmas is an essential, yet not fully elucidated, issue in Earth Sciences. Here, I show that Zn–MgO–SiO2 systematics of magmatic arc rocks correlate significantly with arc thickness. Because Zn–MgO–SiO2 systematics...

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Autor principal: M. Chiaradia
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2021
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Acceso en línea:https://doaj.org/article/4612f76564824e31ab35310014954fce
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spelling oai:doaj.org-article:4612f76564824e31ab35310014954fce2021-12-02T17:55:13ZZinc systematics quantify crustal thickness control on fractionating assemblages of arc magmas10.1038/s41598-021-94290-62045-2322https://doaj.org/article/4612f76564824e31ab35310014954fce2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-94290-6https://doaj.org/toc/2045-2322Abstract Understanding the processes leading to the broad chemical variability of arc magmas is an essential, yet not fully elucidated, issue in Earth Sciences. Here, I show that Zn–MgO–SiO2 systematics of magmatic arc rocks correlate significantly with arc thickness. Because Zn–MgO–SiO2 systematics are mostly controlled by fractionation of different mineral phases, this suggests a systematic change in the proportions of fractionating mineral assemblages depending on arc thickness. Using a mass balance model with a Monte Carlo approach, I show that Zn–MgO–SiO2 systematics can be quantitatively explained by a continuous transition from plagioclase-dominated fractionating assemblages in thin arcs to amphibole-garnet-magnetite-dominated assemblages in increasingly thicker arcs. Most likely, such a systematic change results from the increase of average depth of magma differentiation that is ultimately controlled by arc thickness. Results presented have implications on the causes of different geochemical trends in arcs, the role of arcs as H2O filters, and their association with porphyry deposits.M. ChiaradiaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
M. Chiaradia
Zinc systematics quantify crustal thickness control on fractionating assemblages of arc magmas
description Abstract Understanding the processes leading to the broad chemical variability of arc magmas is an essential, yet not fully elucidated, issue in Earth Sciences. Here, I show that Zn–MgO–SiO2 systematics of magmatic arc rocks correlate significantly with arc thickness. Because Zn–MgO–SiO2 systematics are mostly controlled by fractionation of different mineral phases, this suggests a systematic change in the proportions of fractionating mineral assemblages depending on arc thickness. Using a mass balance model with a Monte Carlo approach, I show that Zn–MgO–SiO2 systematics can be quantitatively explained by a continuous transition from plagioclase-dominated fractionating assemblages in thin arcs to amphibole-garnet-magnetite-dominated assemblages in increasingly thicker arcs. Most likely, such a systematic change results from the increase of average depth of magma differentiation that is ultimately controlled by arc thickness. Results presented have implications on the causes of different geochemical trends in arcs, the role of arcs as H2O filters, and their association with porphyry deposits.
format article
author M. Chiaradia
author_facet M. Chiaradia
author_sort M. Chiaradia
title Zinc systematics quantify crustal thickness control on fractionating assemblages of arc magmas
title_short Zinc systematics quantify crustal thickness control on fractionating assemblages of arc magmas
title_full Zinc systematics quantify crustal thickness control on fractionating assemblages of arc magmas
title_fullStr Zinc systematics quantify crustal thickness control on fractionating assemblages of arc magmas
title_full_unstemmed Zinc systematics quantify crustal thickness control on fractionating assemblages of arc magmas
title_sort zinc systematics quantify crustal thickness control on fractionating assemblages of arc magmas
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/4612f76564824e31ab35310014954fce
work_keys_str_mv AT mchiaradia zincsystematicsquantifycrustalthicknesscontrolonfractionatingassemblagesofarcmagmas
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