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• W2965754080 abstract "Abstract Sulphur isotopes can be used as a powerful tool to trace fluid evolution and explore the formation of chimneys. To clarify the in situ S isotopic variations of sulphides at the micro-scale, we analyzed a sulphide chimney collected from the hydrothermal field in the East Pacific Rise 1–2° S using a sensitive high-mass-resolution ion micro-probe for stable isotopes (SHRIMP SI). Three mineral zones can be identified in the chimney: an external outer wall of porous anhydrite and colloform pyrite, an internal middle zone of sub-euhedral pyrite and massive chalcopyrite, and an inner zone of massive pyrite. The δ 34 S V-CDT values of the sulphides fall within the range 1.83–7.51 ‰ (avg. 4.05 ‰, n = 16), and S isotopic values increase from the core (3.09 ‰, n = 3) to the middle (3.78 ‰, n = 11) to the edge (6.99 ‰, n = 2). These results illustrate mineral crystallization processes and the mixing between seawater-derived S and magmatic–hydrothermal fluids during the growth of the chimney. The zones from the edge to the core are characterized by crystal morphologies of colloform/anhedral pyrite to massive pyrite with decreasing δ 34 S values, revealing multi-stage mineral deposition and sulphur isotopic fractionation. In contrast to the increase in δ 34 S values from the core to the edge in one profile (profile A), anomalously low δ 34 S values in fine-grained pyrite relative to chalcopyrite in another profile (profile B) in the middle zone result from S isotopic exchange between seawater SO 4 2− and fluid H 2 S due to different fluid–seawater mixing, possibly caused by variations in permeability and porosity across the chimney." @default.
• W2965754080 created "2019-08-13" @default.
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• W2965754080 date "2018-05-11" @default.
• W2965754080 modified "2023-09-27" @default.
• W2965754080 title "Multi-stage growth and fluid evolution of a hydrothermal sulphide chimney in the East Pacific Ridge 1–2° S hydrothermal field: constraints from in situ sulphur isotopes" @default.
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• W2965754080 doi "https://doi.org/10.1017/s0016756818000316" @default.
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