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• W4229077139 endingPage "120897" @default.
• W4229077139 startingPage "120897" @default.
• W4229077139 abstract "The 143Nd/144Nd and 176Hf/177Hf values of depleted mid-ocean ridge basalt (MORB) mantle have long been used to calculate the Nd and Hf model ages and constrain the growth rate of the continental crust. However, because continental crust forms principally at subduction zones, the appropriate 143Nd/144Nd and 176Hf/177Hf for use in model age calculations are those of the mantle wedge that underlies the juvenile magmatic arcs. In this study, we compile the Nd and Hf isotopic compositions of the modern island arc volcanic rocks. The average 143Nd/144Nd value obtained for the arc mantle is 0.512959 (εNd = +6.3), with upper and lower 95% confidence uncertainties of 0.513115 (εNd = +9.3) and 0.512613 (εNd = −0.5), respectively. The average obtained for 176Hf/177Hf is 0.283144 (εHf = +13.2) with upper and lower limits of 0.283272 (εHf = +17.7) and 0.282927 (εHf = +5.5), respectively, at the 95% confidence level. The Nd and Hf isotopic compositions of the modern island arc volcanic rocks can be divided into three populations, the high, transitional and low ε arc mantle populations, that reflect a combination of mantle heterogeneity and additions of different slab-derived components to the mantle wedge. The high ε arc mantle (HAM) population (εNd > +5.7 and εHf > +10) and the transitional ε arc mantle (TAM) population (εNd < +5.7 and εHf > +10) were metasomatized by the transfer of unradiogenic Nd and Hf from pelagic sediments, and Fe-Mn crusts and nodules, to the mantle wedge, the HAM by fluid dominate process and the TAM by a combination of sediment melts and fluids. In contrast, melts derived from subducted sediments, particularly zircon-rich turbidites, play a more important role in the low ε arc mantle population (LAM, εNd < +5.7 and εHf < +10). The average of both Nd and Hf isotopic data for the arc mantle, together with the 95% confidence limits, are used to define the arc mantle growth curves and their uncertainties. We suggest that these arc mantle growth curves should be used to calculate Nd and Hf model ages and constrain the growth rate of the continental crust." @default.
• W4229077139 created "2022-05-08" @default.
• W4229077139 creator A5005650192 @default.
• W4229077139 creator A5005758630 @default.
• W4229077139 creator A5006994644 @default.
• W4229077139 date "2022-07-01" @default.
• W4229077139 modified "2023-10-16" @default.
• W4229077139 title "Nd-Hf isotopic systematics of the arc mantle and their implication for continental crust growth" @default.
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• W4229077139 doi "https://doi.org/10.1016/j.chemgeo.2022.120897" @default.
• W4229077139 hasPublicationYear "2022" @default.
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