Redox species and oxygen fugacity of slab-derived fluids: Implications for mantle oxidation and deep carbon-sulfur cycling
نویسندگان
چکیده
The generation and migration of slab-derived fluids modulate subduction zone seismicity, arc magmatism, deep volatile cycling. However, the redox species oxygen fugacity ( f O 2 ) (hereafter expressed as log units relative to fayalite–magnetite–quartz buffer, ?FMQ) are highly debated. Here we conducted phase equilibria modeling on altered oceanic crust (AOC) serpentinites along typical geotherms in C-S-bearing system over a pressure range 0.5–6 GPa. With averaged compositions AOC serpentinite, our calculated results show that oxidized carbon-sulfur dominate during slab subduction. As result, at or above ?FMQ values magmas forearc subarc depths. predicted carbon sulfur compatible with natural observations fluid inclusions from many HP metamorphic rocks. More importantly, it is revealed that, state primarily controlled by budget (RB) prior Subduction-zone thermal structure, however, only exerts minor influence , which supported similar ranges lavas cold hot zones. Our models further if an open assumed, most (>70%) (>50%) subducted serpentinite would be lost Small amounts could transported into deeper mantle via closed-system open-system subduction, supplying source materials for volatile-rich intraplate superdeep diamonds.
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ژورنال
عنوان ژورنال: Frontiers in Earth Science
سال: 2022
ISSN: ['2296-6463']
DOI: https://doi.org/10.3389/feart.2022.974548