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Coupled geochemical-petrological-geodynamical modelling of subduction zones

English title Coupled geochemical-petrological-geodynamical modelling of subduction zones
Applicant Gerya Taras
Number 129487
Funding scheme Project funding
Research institution Institut für Geophysik ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Geophysics
Start/End 01.04.2010 - 30.11.2010
Approved amount 39'804.00
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Keywords (5)

Subduction; mantle convection; geochemistry; numerical modeling; volcanic arcs

Lay Summary (English)

Lead
Lay summary
Subduction enforces a great material exchange between Earth's mantle and crust; and mainly subduction triggers the mantle convection. Thus, to understand dynamics of subduction and to resolve processes occurring within mantle wedge and subducting slab are highly important in order to better understand geochemical evolution of the global mantle. Fully integrated geophysical - geochemical models are arguably the best approach to study the dynamics of subduction (from its initiation) and related crust formation in intraoceanic and oceanic-continental settings, but so far only a few studies have used this approach. We propose to use a fully integrated geophysical-geochemical-petrological approach to study the water and trace element evolution during subduction using numerical geodynamical models that track water and trace elements. We will use self-consistent 2D numerical models of spontaneous intraoceanic and oceanic-continental subduction with coupled compositional-petrological-geodynamical processes in the mantle wedge and magmatic arc (including crustal growth processes) resolved at high resolution.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Name Institute

Publications

Publication
Lead transport in intra-oceanic subduction zones: 2D geochemical–thermo-mechanical modeling of isotopic signatures
Baitsch-Ghirardello B. Stracke A. Connolly J.A.D. Nikolaeva K.M. GeryaT.V. (2014), Lead transport in intra-oceanic subduction zones: 2D geochemical–thermo-mechanical modeling of isotopic signatures, in Lithos, 208–209, 265.
Testing the influence of far-field topographic forcing on subduction initiation at
Marques F.O. Nikolaeva K. Assumpcao M. Gerya T.V, Bezerra F.H.R. do Nascimento A.F. Ferreira J.M. (2013), Testing the influence of far-field topographic forcing on subduction initiation at, in Tectonophysics, 608, 517-524.
Numerical analysis of subduction initiation risk along the Atlantic American passive margins
Nikolaeva K. Gerya T.V. Marques F.O. (2011), Numerical analysis of subduction initiation risk along the Atlantic American passive margins, in Geology, 39, 463.
Subduction initiation at passive margins: numerical modeling
Nikolaeva K. T.V. Gerya and F.O. Marques (2010), Subduction initiation at passive margins: numerical modeling, in Journal of Geophysical Research, 115, B03406.

Collaboration

Group / person Country
Types of collaboration
Prof. F.O. Marques, University of Lisbon Portugal (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication

Communication with the public

Communication Title Media Place Year
Media relations: print media, online media The Atlantic ‘resting’ – for now ETH-Life International 2011

Associated projects

Number Title Start Funding scheme
113672 Coupled geochemical-petrological-geodynamical modelling of subduction zones and global mantle convection 01.12.2006 Project funding

Abstract

Subduction enforces a great material exchange between Earth’s mantle and crust; and mainly subduction triggers the mantle convection. Thus, to understand dynamics of subduction and to resolve processes occurring within mantle wedge and subducting slab are highly important in order to better understand geochemical evolution of the global mantle. Fully integrated geophysical - geochemical models are arguably the best approach to study the dynamics of subduction (from its initiation) and related crust formation in intraoceanic and oceanic-continental settings, but so far only a few studies have used this approach. We propose to use a fully integrated geophysical-geochemical-petrological approach to study the water and trace element evolution during subduction using numerical geodynamical models that track water and trace elements. We will use self-consistent 2D numerical models of spontaneous intraoceanic and oceanic-continental subduction with coupled compositional-petrological-geodynamical processes in the mantle wedge and magmatic arc (including crustal growth processes) resolved at high resolution. These models are already developed during the previous project for which one-year extension is needed. This extension will allow the PhD student (Ksenia Nikolaeva) employed in the previous project to run remaining numerical experiments, publish remaining papers and prepare the PhD thesis.
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