Faults that develop in subducting slabs act as conduits for sea water. Numerical modelling indicates that pressure gradients resulting from the bending of slabs may then drive the water deep into their interior.
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Billen, M. Soaking slabs. Nature Geosci 2, 744–746 (2009). https://doi.org/10.1038/ngeo674
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DOI: https://doi.org/10.1038/ngeo674
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