Deep water recycling through time

Geochemistry, Geophysics, Geosystems : G³
Valentina MagniJeroen van Hunen

Abstract

We investigate the dehydration processes in subduction zones and their implications for the water cycle throughout Earth's history. We use a numerical tool that combines thermo-mechanical models with a thermodynamic database to examine slab dehydration for present-day and early Earth settings and its consequences for the deep water recycling. We investigate the reactions responsible for releasing water from the crust and the hydrated lithospheric mantle and how they change with subduction velocity (vs ), slab age (a) and mantle temperature (Tm). Our results show that faster slabs dehydrate over a wide area: they start dehydrating shallower and they carry water deeper into the mantle. We parameterize the amount of water that can be carried deep into the mantle, W (×10(5) kg/m(2)), as a function of vs (cm/yr), a (Myrs), and Tm (°C):[Formula: see text]. We generally observe that a 1) 100°C increase in the mantle temperature, or 2) ∼15 Myr decrease of plate age, or 3) decrease in subduction velocity of ∼2 cm/yr all have the same effect on the amount of water retained in the slab at depth, corresponding to a decrease of ∼2.2×10(5) kg/m(2) of H2O. We estimate that for present-day conditions ∼26% of the global influx water, or 7×10(8)...Continue Reading

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Citations

Dec 17, 2016·Nature Communications·Marie-Laure PonsHelen Williams
Oct 3, 2018·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Jun Korenaga
Dec 7, 2018·Scientific Reports·Mathew DomeierTrond H Torsvik
Feb 7, 2020·Geochemistry, Geophysics, Geosystems : G³·Nicholas SchliffkeMark B Allen
Mar 7, 2021·Nature Communications·Yoonah BangYongjae Lee
May 15, 2021·Scientific Reports·Thomas P Ferrand, Elena F Manea

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