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- W2979432500 endingPage "4829" @default.
- W2979432500 startingPage "4810" @default.
- W2979432500 abstract "The “metasomatic underplating” hypothesis argues that crustal fractures develop during hot spot magma ascent to allow seawater to infiltrate and to serpentinize the sub-Moho mantle. Published seismic velocities and layer thicknesses support estimates that 1 km of seawater could be chemically bound within an underplated layer, which may require 2–4 Myr to mature. If a serpentinized mantle layer underlies hot spot tracks and/or aseismic ridges, their buoyancy can induce flat-slab behavior within subduction zones (e.g., beneath central Chile and Peru), weaken slab rheology, and foster slab tears. During serpentinization, metasomatic underplating would produce more serpentine and talc and less brucite and magnetite, if seawater equilibrates with silica in the gabbroic oceanic crust as it descends to the Moho. The restricted solubility of carbonate with temperature may induce seawater CO2 to sequester in the crust as carbonate concretions or intergrowths. Consumption of seawater H2O by serpentinization raises its salinity so that Fe cations stabilize in chloride complexes and depart the open system. Alkali cations in seawater contribute to the sodic metasomatism of pyroxenes, analogous to alterations observed in abyssal peridotites." @default.
- W2979432500 created "2019-10-18" @default.
- W2979432500 creator A5006897234 @default.
- W2979432500 creator A5049424223 @default.
- W2979432500 date "2019-11-01" @default.
- W2979432500 modified "2023-10-16" @default.
- W2979432500 title "Broader Impacts of the Metasomatic Underplating Hypothesis" @default.
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