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Slab-parallel advection versus Rayleigh-Taylor instabilities in melt-rich layers in subduction zones : A criticality analysis

Ghosh, Dip; Maiti, Giridas; Mandal, Nibir

Abstract (englisch):
We show slab-parallel advection and Rayleigh-Taylor instability (RTI) as two competing gravity-driven flow mechanisms in the melt-rich layer atop a subducting slab. Scaled laboratory model results, supported by CFD simulations, indicate a transition of the RTI to advection mechanism at a threshold slab-dip angle (α) between 20° and 30°. The advection mechanism results in updip flow, forming a single plume at the upper edge of the melt-rich layer. Based on lubrication approximation, we present an analytical solution of the linear stability problem to perform a criticality analysis of α for the transition between RTI and advection, as observed in the experiments. The solution indicates this transition to occur at α⁎ = 28°, in favorable agreement with the experimental values. The article finally highlights the implications of this criticality analysis in interpreting the spatial distributions of subduction volcanism.

DOI: 10.1016/j.pepi.2020.106560
Zitationen: 2
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 10.2020
Sprache Englisch
Identifikator ISSN: 0031-9201
KITopen-ID: 1000140019
Erschienen in Physics of the earth and planetary interiors
Verlag Elsevier
Band 307
Seiten Article no: 106560
Nachgewiesen in Scopus
Web of Science
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