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- W3137713019 endingPage "101182" @default.
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- W3137713019 abstract "Zinc isotopes may act as a new tool of tracking recycling of crustal materials that causes compositional heterogeneity of the mantle. This application relies on an investigation of Zn isotopic behaviors during slab subduction. In this study, we report Zn isotopic compositions for a suite of metabasalts (greenschists, amphibolites, and coesite-bearing eclogites) from the Dabie Orogen (China), which were formed via the subduction of mafic rocks into different depths and up to > 200 km. Three out of eight greenschists are characterized by lighter δ 66 Zn JMC-Lyon (0.10‰–0.16‰) than those of global basalts (0.28‰ ± 0.05‰), which may be caused by crustal assimilation of the protoliths by sedimentary rocks due to their extremely high 87 Sr/ 86 Sr (up to 0.7130) and low εNd values (down to −12.3). The remaining greenschists have relatively low 87 Sr/ 86 Sr and their δ 66 Zn values (0.21‰–0.38‰) overlap the ranges of amphibolites (0.18‰–0.32‰) and coesite-bearing eclogites (0.18‰–0.36‰). There is no correlation between δ 66 Zn and sensitive indicators of dehydration (Rb/TiO 2 , Ba/Yb, and H 2 O + ), suggesting that no detectable Zn isotope fractionation has occurred during the deep subduction of mafic rocks even into > 200 km, which is attributed to the limited loss of Zn during prograde metamorphism and dehydration. Thus, Zn isotopic compositions of the deeply subducted mafic rocks are inherited from their protoliths. Considering that these metamorphosed rocks have higher δ 66 Zn than that of the mantle value by up to 0.2‰, the recycled/subducted mafic crust can incorporate isotopically heavy Zn into the mantle. The subducted slabs may partially melt and generate a metasomatized mantle, resulting in changes of Zn isotopic composition of the hybridized mantle as have been observed in some mantle xenoliths and basaltic lavas. • A Zn isotopic study on a suite of greenschist, amphibolite, and eclogite. • No detectable Zn isotope fractionation during deep subduction of mafic rocks to >200 km. • Recycled mafic crust can incorporate isotopically heavy Zn into the mantle." @default.
- W3137713019 created "2021-03-29" @default.
- W3137713019 creator A5042538052 @default.
- W3137713019 creator A5078152672 @default.
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- W3137713019 date "2021-09-01" @default.
- W3137713019 modified "2023-10-17" @default.
- W3137713019 title "Zinc isotopic behavior of mafic rocks during continental deep subduction" @default.
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- W3137713019 doi "https://doi.org/10.1016/j.gsf.2021.101182" @default.
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