Geological records of transient fluid drainage into the shallow mantle wedge.

ABSTRACT: Pore fluid pressure on subduction zone megathrusts is lowered by fluid drainage into the overlying plate, affecting subduction zone seismicity. However, the spatial and temporal scales of fluid flow through suprasubduction zones are poorly understood. We constrain the duration and velocity of fluid flow through a shallow mantle wedge based on the analyses of vein networks consisting of high-temperature serpentine in hydrated ultramafic rocks from the Oman ophiolite. On the basis of a diffusion model and the time-integrated fluid flux, we show that the channelized fluid flow was short-lived (2.1 × 10^-1 to 1.1 × 10¹ years) and had a high fluid velocity (2.7 × 10^-3 to 4.9 × 10^-2 meters second^-1), which is close to the propagation velociti

SUBMITTER: Yoshida K 

PROVIDER: S-EPMC10075964 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature