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Chalcophile elements in post-subduction magmas and implications for metal recycling in oceanic and continental subduction.

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Title:	Chalcophile elements in post-subduction magmas and implications for metal recycling in oceanic and continental subduction.
Authors:	Wang, Xiang¹ (AUTHOR), Wang, Zaicong¹ (AUTHOR) zaicongwang@cug.edu.cn, Dai, Li-Qun^1,2 (AUTHOR), Zhang, Wen¹ (AUTHOR), Deng, Xiaodong³ (AUTHOR), Zhang, Xi⁴ (AUTHOR), Foley, Stephen⁵ (AUTHOR), Langmuir, Charles H.⁶ (AUTHOR), Fang, Wei² (AUTHOR), Wang, Lang¹ (AUTHOR), He, Tao¹ (AUTHOR), Ren, Aiqing¹ (AUTHOR), Hu, Zhaochu¹ (AUTHOR), Zong, Keqing¹ (AUTHOR), Liu, Yongsheng¹ (AUTHOR), Li, Jianwei³ (AUTHOR), Cheng, Huai⁷ (AUTHOR), Zhang, Pingyang⁸ (AUTHOR)
Source:	Geochimica et Cosmochimica Acta. Oct2025, Vol. 407, p193-210. 18p.
Subjects:	Metal recycling, Ore deposits, Chalcogenides, Isotopic analysis, Subduction zones, Lithosphere, Magmas
Abstract:	Subduction-driven recycling of chalcophile metals plays a crucial role in mantle enrichment and the formation of ore deposits. However, the role of oceanic and continental subduction in the recycling of various chalcophile elements, and their impact on the metal enrichment of metasomatized mantle and mantle-derived magmas remain poorly constrained. Here we report chalcophile element contents and S-Os isotopes for post-subduction magmas in the North China Craton. Magmas formed from mantle sources modified by oceanic subduction display elevated Ba/Nb (10–20), δ34S (0 ‰ − 2 ‰) and low εNd (t) (−4 to 5) values, along with the variable S (700–3200 μg/g) and low platinum-group elements (PGE), Au (0.1–1 ng/g), and Cu (20–50 μg/g) contents. By comparison, magmas formed following continental subduction with subsequent oceanic subduction display significantly higher Ba/Nb (100–500), δ34S (2 ‰ − 6 ‰), and lower εNd (t) (−20 to −2) values, and with higher S (up to 4700 μg/g), Au (1–4 ng/g) but similarly low PGE and Cu (20–70 μg/g) contents. The secondary processes and magmatic differentiation did not significantly affect their chalcophile element contents and patterns. The MORB-like PGE, Cu contents, together with Os/Ir, Ru/Ir, Pd/Ir, and Cu/Pd ratios in all high-Mg# (> 60) hydrous and oxidizing magmas suggest relatively limited PGE and Cu addition from the subducted oceanic and continental slabs. Conversely, continental subduction likely plays a key role in the enrichment of fluid-mobile elements (e.g., Ba, K) and Sr-Nd-S isotope signatures in the affected mantle, with moderate Au enrichment as reflected by higher Au contents and Au/Pd ratios in continental subduction-related magmas. Modelling results further show that the metasomatized mantle has chalcophile metal contents similar to, or slightly higher than, those of Paleozoic depleted mantle beneath the NCC, but lower than primitive mantle. Integrating our results with compiled global data on mantle peridotites/pyroxenites and sulfides, we conclude that subduction-related mantle metasomatism contributes substantial volatiles, and may also have restored strongly chalcophile metals in depleted lithospheric mantle to a level of fertile mantle for subsequent magmatic-hydrothermal processes and mineralization. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	Subduction-driven recycling of chalcophile metals plays a crucial role in mantle enrichment and the formation of ore deposits. However, the role of oceanic and continental subduction in the recycling of various chalcophile elements, and their impact on the metal enrichment of metasomatized mantle and mantle-derived magmas remain poorly constrained. Here we report chalcophile element contents and S-Os isotopes for post-subduction magmas in the North China Craton. Magmas formed from mantle sources modified by oceanic subduction display elevated Ba/Nb (10–20), δ34S (0 ‰ − 2 ‰) and low εNd (t) (−4 to 5) values, along with the variable S (700–3200 μg/g) and low platinum-group elements (PGE), Au (0.1–1 ng/g), and Cu (20–50 μg/g) contents. By comparison, magmas formed following continental subduction with subsequent oceanic subduction display significantly higher Ba/Nb (100–500), δ34S (2 ‰ − 6 ‰), and lower εNd (t) (−20 to −2) values, and with higher S (up to 4700 μg/g), Au (1–4 ng/g) but similarly low PGE and Cu (20–70 μg/g) contents. The secondary processes and magmatic differentiation did not significantly affect their chalcophile element contents and patterns. The MORB-like PGE, Cu contents, together with Os/Ir, Ru/Ir, Pd/Ir, and Cu/Pd ratios in all high-Mg# (> 60) hydrous and oxidizing magmas suggest relatively limited PGE and Cu addition from the subducted oceanic and continental slabs. Conversely, continental subduction likely plays a key role in the enrichment of fluid-mobile elements (e.g., Ba, K) and Sr-Nd-S isotope signatures in the affected mantle, with moderate Au enrichment as reflected by higher Au contents and Au/Pd ratios in continental subduction-related magmas. Modelling results further show that the metasomatized mantle has chalcophile metal contents similar to, or slightly higher than, those of Paleozoic depleted mantle beneath the NCC, but lower than primitive mantle. Integrating our results with compiled global data on mantle peridotites/pyroxenites and sulfides, we conclude that subduction-related mantle metasomatism contributes substantial volatiles, and may also have restored strongly chalcophile metals in depleted lithospheric mantle to a level of fertile mantle for subsequent magmatic-hydrothermal processes and mineralization. [ABSTRACT FROM AUTHOR]
ISSN:	00167037
DOI:	10.1016/j.gca.2025.09.023