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The role of sulphur on the melting of Ca-poor sediment and on trace element transfer in subduction zones: an experimental investigation

Anne-Aziliz Pelleter 1, 2 Gaëlle Prouteau 1, 2 Bruno Scaillet 1, 2
2 Magma - UMR7327
ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327
Abstract : We performed phase equilibrium experiments on a natural Ca-poor pelite at 3 GPa, 750-1000°C, under moderately oxidizing conditions, simulating the partial melting of such lithologies in subduction zones. Experiments investigated the effect of sulphur addition on phase equilibria and compositions, with S contents of up to ~ 2.2 wt. %. Run products were characterized for their major and trace element contents, in order to shed light on the role of sulphur on the trace element patterns of melts produced by partial melting of oceanic Ca-poor sediments. Results show that sulphur addition leads to the replacement of phengite by biotite along with the progressive consumption of garnet, which is replaced by an orthopyroxenekyanite assemblage at the highest sulphur content investigated. All Fe-Mg silicate phases produced with sulphur, including melt, have higher MgO/(MgO+FeO) ratios (relative to Sfree/poor conditions), owing to Fe being primarily locked up by sulphide in the investigated redox range. Secular infiltration of the mantle wedge by such MgO and K 2 O-rich melts may
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Anne-Aziliz Pelleter, Gaëlle Prouteau, Bruno Scaillet. The role of sulphur on the melting of Ca-poor sediment and on trace element transfer in subduction zones: an experimental investigation. Journal of Petrology, Oxford University Press (OUP), 2021, Accepted Manuscript, pp.egab005. ⟨10.1093/petrology/egab005⟩. ⟨insu-03143260⟩

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