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• W4382058770 abstract "Fluids are important media for elemental cycling in subduction zones, but the compositions of such fluids remain obscure, especially those derived from dehydration of serpentinite. To better understand the role of subduction-zone fluids in arc magmatism of the Chinese Eastern Tianshan (CET), we present Mg and B isotopic data for the arc diorites (e.g. Kalatage and Nanshankou). Our results show that the Kalatage diorites have higher <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>δ</mml:mi> </mml:math> 26 Mg (−0.23 to −0.13‰) and <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>δ</mml:mi> </mml:math> 11 B (−0.04 to +1.08‰) values than the corresponding mantle values, whereas the Nanshankou diorites display relatively lower <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>δ</mml:mi> </mml:math> 26 Mg (−0.26 to −0.19‰) and <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>δ</mml:mi> </mml:math> 11 B (−10.7 to −2.97‰) values. Because high-temperature magmatic and post-magmatic processes have limited effects on Mg and B isotope fractionation of our samples, their distinct Mg–B isotopic signatures inherited from the mantle sources should be caused by subduction-related metasomatism. Because neither altered oceanic crust (AOC) directly melting nor the incorporation of subducted sediments could induce significant Mg–B isotope fractionation in these rocks, we infer that their variable <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>δ</mml:mi> </mml:math> 26 Mg and <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>δ</mml:mi> </mml:math> 11 B values were probably associated with subduction fluids that were derived from different sources. Specifically, dehydrated fluids from serpentinites possess high <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>δ</mml:mi> </mml:math> 26 Mg and <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>δ</mml:mi> </mml:math> 11 B values, which resulted in the heavy Mg–B isotopic compositions of the Kalatage diorites, whereas mantle metasomatized by fluids from AOC and subducted sediments were responsible for the Nanshankou rocks with relatively low <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>δ</mml:mi> </mml:math> 26 Mg and <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi>δ</mml:mi> </mml:math> 11 B values. Taking into account the different effects of serpentinite-derived and slab-derived fluids in the formation of arc magmatism, subduction-zone fluids can be probably an important factor in changing the Mg–B isotope composition of mantle sources. Supplementary material : Supplementary data tables and parameters used in models are available at https://doi.org/10.6084/m9.figshare.c.6702686" @default.
• W4382058770 created "2023-06-27" @default.
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• W4382058770 date "2023-08-23" @default.
• W4382058770 modified "2023-10-05" @default.
• W4382058770 title "Different effects of serpentinite-derived and slab-derived fluids on arc magmatism in the Chinese Eastern Tianshan: evidence from Mg–B isotopic systematics" @default.
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• W4382058770 doi "https://doi.org/10.1144/jgs2023-011" @default.
• W4382058770 hasPublicationYear "2023" @default.
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