Influence of Variable Thermal Expansivity and Conductivity on Deep Subduction

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F15%3A00000185" target="_blank" >RIV/00025798:_____/15:00000185 - isvavai.cz</a>

Výsledek na webu

<a href="http://eu.wiley.com/WileyCDA/WileyTitle/productCd-1118888855.html" target="_blank" >http://eu.wiley.com/WileyCDA/WileyTitle/productCd-1118888855.html</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/9781118888865.ch0" target="_blank" >10.1002/9781118888865.ch0</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Influence of Variable Thermal Expansivity and Conductivity on Deep Subduction

Popis výsledku v původním jazyce

Thickening of slabs subducted in the lower mantle is a robust feature from seismic tomography. Numerical models show clearly that, under suitable circumstances, deeply subducted plates experience buckling instabilities near the transition zone. These canlead to the formation of large-scale folds, which ultimately cause the lower mantle portion of slabs to be significantly thicker than the upper mantle part. Such models, however, generally rely on the assumption of constant thermodynamic properties. Here we present subduction simulations that include pressure-, temperature-, and phase-dependent thermal expansivity and conductivity, and demonstrate that these parameters exert a dramatic effect on the dynamics of lower mantle slabs. The decrease of expansivity with pressure causes slabs to lose buoyancy during their descent. This strongly enhances buckling and reduces sinking speed, thereby promoting thermal diffusion and a significant spreading of the slab thermal anomalies in the lower

Název v anglickém jazyce

Influence of Variable Thermal Expansivity and Conductivity on Deep Subduction

Popis výsledku anglicky

Thickening of slabs subducted in the lower mantle is a robust feature from seismic tomography. Numerical models show clearly that, under suitable circumstances, deeply subducted plates experience buckling instabilities near the transition zone. These canlead to the formation of large-scale folds, which ultimately cause the lower mantle portion of slabs to be significantly thicker than the upper mantle part. Such models, however, generally rely on the assumption of constant thermodynamic properties. Here we present subduction simulations that include pressure-, temperature-, and phase-dependent thermal expansivity and conductivity, and demonstrate that these parameters exert a dramatic effect on the dynamics of lower mantle slabs. The decrease of expansivity with pressure causes slabs to lose buoyancy during their descent. This strongly enhances buckling and reduces sinking speed, thereby promoting thermal diffusion and a significant spreading of the slab thermal anomalies in the lower

Druh

C - Kapitola v odborné knize

CEP obor

DB - Geologie a mineralogie

OECD FORD obor

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Projekt

<a href="/cs/project/LK11202" target="_blank" >LK11202: Role paleozoických akrečních a kolizních orogénů na tvorbu a růst kontinentální kůry</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název knihy nebo sborníku

Subduction Dynamics: From Mantle Flow to Mega Disasters

ISBN

9781118888858

Počet stran výsledku

19

Strana od-do

115-133

Počet stran knihy

210

Název nakladatele

American Geophysical Union

Místo vydání

Washington

Kód UT WoS kapitoly

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