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Statements

Subject Item
n2:RIV%2F00216208%3A11320%2F13%3A10139816%21RIV14-GA0-11320___
rdf:type
skos:Concept n9:Vysledek
rdfs:seeAlso
http://dx.doi.org/10.1007/s11200-012-0259-7
dcterms:description
Processes within subduction zones have a major influence on the plate dynamics and mantle convection. Subduction is controlled by a combination of many parameters and there is no simple global relationship between the resulting slab geometry and deformation and any specific subduction parameter. In the present work we perform a parametric study of slab dynamics in a two-dimensional model with composite rheology including diffusion creep, dislocation creep and stress limiter or Peierls creep. The mechanical decoupling of the subducting and overriding plates is facilitated by a low viscosity crust. We are particularly interested in the effect of the contact of subducting and overriding plates on the plate geometry in the upper mantle. We also study the influence of the surface boundary condition and of the rheological description (yield stress of stress-limiting rheology, additional viscosity contrast at 660-km discontinuity). Our results demonstrate that the slab morphology and deformation in the upper mantle and the transition zone is sensitive not only to the slab strength, but also to the decoupling mechanism at the contact of the subducting and overriding plates. Weak crust with a viscosity of 10(20) Pa s effectively decouples the subducting and overriding plates and produces reasonable slab morphologies. The geometry of the slab in the upper mantle is strongly influenced by the initial geometry of the contact between the subducting and overriding plates. Further, a step-wise viscosity increase by about an order of magnitude at 660 km depth is necessary to limit the plate velocities to a reasonable value around 5 cm/yr. Processes within subduction zones have a major influence on the plate dynamics and mantle convection. Subduction is controlled by a combination of many parameters and there is no simple global relationship between the resulting slab geometry and deformation and any specific subduction parameter. In the present work we perform a parametric study of slab dynamics in a two-dimensional model with composite rheology including diffusion creep, dislocation creep and stress limiter or Peierls creep. The mechanical decoupling of the subducting and overriding plates is facilitated by a low viscosity crust. We are particularly interested in the effect of the contact of subducting and overriding plates on the plate geometry in the upper mantle. We also study the influence of the surface boundary condition and of the rheological description (yield stress of stress-limiting rheology, additional viscosity contrast at 660-km discontinuity). Our results demonstrate that the slab morphology and deformation in the upper mantle and the transition zone is sensitive not only to the slab strength, but also to the decoupling mechanism at the contact of the subducting and overriding plates. Weak crust with a viscosity of 10(20) Pa s effectively decouples the subducting and overriding plates and produces reasonable slab morphologies. The geometry of the slab in the upper mantle is strongly influenced by the initial geometry of the contact between the subducting and overriding plates. Further, a step-wise viscosity increase by about an order of magnitude at 660 km depth is necessary to limit the plate velocities to a reasonable value around 5 cm/yr.
dcterms:title
The effects of rheological decoupling on slab deformation in the Earth's upper mantle The effects of rheological decoupling on slab deformation in the Earth's upper mantle
skos:prefLabel
The effects of rheological decoupling on slab deformation in the Earth's upper mantle The effects of rheological decoupling on slab deformation in the Earth's upper mantle
skos:notation
RIV/00216208:11320/13:10139816!RIV14-GA0-11320___
n9:predkladatel
n22:orjk%3A11320
n4:aktivita
n7:I n7:P n7:Z
n4:aktivity
I, P(GAP210/11/1366), Z(MSM0021620860)
n4:cisloPeriodika
3
n4:dodaniDat
n18:2014
n4:domaciTvurceVysledku
n14:4783034 n14:5782058
n4:druhVysledku
n10:J
n4:duvernostUdaju
n19:S
n4:entitaPredkladatele
n20:predkladatel
n4:idSjednocenehoVysledku
71987
n4:idVysledku
RIV/00216208:11320/13:10139816
n4:jazykVysledku
n12:eng
n4:klicovaSlova
rheology; slab deformation; subduction
n4:klicoveSlovo
n6:rheology n6:slab%20deformation n6:subduction
n4:kodStatuVydavatele
CZ - Česká republika
n4:kontrolniKodProRIV
[18B9F28B3CE2]
n4:nazevZdroje
Studia Geophysica et Geodaetica
n4:obor
n13:DC
n4:pocetDomacichTvurcuVysledku
2
n4:pocetTvurcuVysledku
3
n4:projekt
n8:GAP210%2F11%2F1366
n4:rokUplatneniVysledku
n18:2013
n4:svazekPeriodika
57
n4:tvurceVysledku
van den Berg, Arie Čížková, Hana Androvičová, Adela
n4:wos
000323315400007
n4:zamer
n21:MSM0021620860
s:issn
0039-3169
s:numberOfPages
22
n17:doi
10.1007/s11200-012-0259-7
n15:organizacniJednotka
11320