Saline aqueous fluid circulation in mantle wedge inferred from olivine wetting properties

Yongsheng Huang (), Takayuki Nakatani, Michihiko Nakamura and Catherine McCammon
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Yongsheng Huang: Tohoku University, Aramaki-Aza-Aoba, Aoba-ku
Takayuki Nakatani: Tohoku University, Aramaki-Aza-Aoba, Aoba-ku
Michihiko Nakamura: Tohoku University, Aramaki-Aza-Aoba, Aoba-ku
Catherine McCammon: University of Bayreuth

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract Recently, high electrical conductors have been detected beneath some fore-arcs and are believed to store voluminous slab-derived fluids. This implies that the for-arc mantle wedge is permeable for aqueous fluids. Here, we precisely determine the dihedral (wetting) angle in an olivine–NaCl–H2O system at fore-arc mantle conditions to assess the effect of salinity of subduction-zone fluids on the fluid connectivity. We find that NaCl significantly decreases the dihedral angle to below 60° in all investigated conditions at concentrations above 5 wt% and, importantly, even at 1 wt% at 2 GPa. Our results show that slab-released fluid forms an interconnected network at relatively shallow depths of ~80 km and can partly reach the fore-arc crust without causing wet-melting and serpentinization of the mantle. Fluid transport through this permeable window of mantle wedge accounts for the location of the high electrical conductivity anomalies detected in fore-arc regions.

Date: 2019
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DOI: 10.1038/s41467-019-13513-7

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