Mathematical Modeling of the Mechanism of Continental Subduction

A thermo-mechanical numerical model of subduction and subsequent ascent of continental metasediments to the crust has been proposed. The model of the “cold” subduction describes the mechanism of the formation of high-pressure metamorphic complexes, which are a mixture of metapelites and metabasites,...

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Bibliographic Details
Published inDoklady earth sciences Vol. 503; no. 2; pp. 179 - 184
Main Authors Reverdatto, V. V., Polyansky, O. P., Semenov, A. N., Babichev, A. V.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.04.2022
Springer
Springer Nature B.V
Subjects
Analysis
Continental crust
Dehydration
Diapirs
Earth
Earth and Environmental Science
Earth Sciences
Geodynamics
High pressure
Mantle
Mathematical models
Metamorphism
Metamorphism (Geology)
Numerical models
Rocks, Metamorphic
Subduction
Upper mantle
Viscosity
subduction
viscosity
phase transition
floating-up
numerical modeling
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Summary:A thermo-mechanical numerical model of subduction and subsequent ascent of continental metasediments to the crust has been proposed. The model of the “cold” subduction describes the mechanism of the formation of high-pressure metamorphic complexes, which are a mixture of metapelites and metabasites, the positively and negatively buoyant (relative to the upper mantle) material of the continental crust. The trigger of the reversal flow is dehydration and a decrease in the viscosity of the subducted substance under conditions that do not reach melting. The exhumation rates and the forms of PT -trends at the progressive and regressive stages of metamorphism have been assessed and compared with natural complexes. It has been shown that the mechanism of the diapir reversal flow is characterized by the rates of exhumation of high-pressure complexes that are 2–3 times lower than the rate of subduction.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X22040158