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Selenium isotope constraints on sediment–oceanic crust interaction during slab deserpentinization
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DOI：10.1016/j.gca.2026.07.049.png)
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Abstract
En 中文
Arc magmas acquire their subduction-component signature through mantle-wedge metasomatism by slab-derived fluids and melts sourced in variable proportions from altered oceanic crust (AOC) and metasediments. At subarc depths, deserpentinization of slab mantle promotes this transfer by releasing large volumes of fluids that mobilize AOC- and sediment-derived components into the mantle-wedge source of arc volcanism. To constrain subarc fluid–rock interactions during slab deserpentinization, we present new selenium (Se) isotope data for rocks from the Cerro del Almirez ultramafic massif (Nevado–Filábride Complex, Betic Cordillera, southern Spain) formed in a subarc paleo-subduction setting. We report Se isotopes, radiogenic strontium (Sr) isotopes, and fluid-mobile element concentrations in metaserpentinites (antigorite-serpentinite), their subarc dehydration products (chlorite-harzburgite), interbedded metarodingites, and associated metasediments.
Keywords:
Selenium isotopes
Serpentinite dehydration
Cerrodel Almirez
Slab fluids
Arc volcanism
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