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

Author

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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)

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.

Suggested Citation

  • Yongsheng Huang & Takayuki Nakatani & Michihiko Nakamura & Catherine McCammon, 2019. "Saline aqueous fluid circulation in mantle wedge inferred from olivine wetting properties," Nature Communications, Nature, vol. 10(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-13513-7
    DOI: 10.1038/s41467-019-13513-7
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