Effect of post-perovskite rheology on the thermal evolution of the Earth

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F16%3A10330164" target="_blank" >RIV/00216208:11320/16:10330164 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.pepi.2015.11.004" target="_blank" >http://dx.doi.org/10.1016/j.pepi.2015.11.004</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.pepi.2015.11.004" target="_blank" >10.1016/j.pepi.2015.11.004</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of post-perovskite rheology on the thermal evolution of the Earth

Popis výsledku v původním jazyce

Secular cooling of the Earth mantle is a complex process affected by many factors. Here we present the results of a modelling study focused on efficiency of cooling in the presence of theologically distinct post-perovskite. We evaluate combined effects of variable thermal expansivity and diffusivity, initial thermal condition and heat source model and concentrate on the effects of rheologically weak post-perovskite. Cooling of the core is included in the model core is assumed to be an isothermal heat reservoir with temperature controlled by heat flux through core-mantle boundary. Our 2D axisymmetric convection model has pressure, temperature and phase dependent viscosity and includes the effects of an endothermic phase transition at 660 km depth and an exothermic perovskite-post-perovskite phase transition in the lowermost mantle. In agreement with previous studies we conclude that depth-dependent material parameters tend to delay secular cooling. Presence of the weak post-perovskite on the other hand significantly enhances core cooling and its effect on core temperature is opposite and comparable in magnitude.

Název v anglickém jazyce

Effect of post-perovskite rheology on the thermal evolution of the Earth

Popis výsledku anglicky

Secular cooling of the Earth mantle is a complex process affected by many factors. Here we present the results of a modelling study focused on efficiency of cooling in the presence of theologically distinct post-perovskite. We evaluate combined effects of variable thermal expansivity and diffusivity, initial thermal condition and heat source model and concentrate on the effects of rheologically weak post-perovskite. Cooling of the core is included in the model core is assumed to be an isothermal heat reservoir with temperature controlled by heat flux through core-mantle boundary. Our 2D axisymmetric convection model has pressure, temperature and phase dependent viscosity and includes the effects of an endothermic phase transition at 660 km depth and an exothermic perovskite-post-perovskite phase transition in the lowermost mantle. In agreement with previous studies we conclude that depth-dependent material parameters tend to delay secular cooling. Presence of the weak post-perovskite on the other hand significantly enhances core cooling and its effect on core temperature is opposite and comparable in magnitude.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DE - Zemský magnetismus, geodesie, geografie

OECD FORD obor

—

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Physics of the Earth and Planetary Interiors

ISSN

0031-9201

e-ISSN

—

Svazek periodika

251

Číslo periodika v rámci svazku

-

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

10

Strana od-do

1-10

Kód UT WoS článku

000370095500001

EID výsledku v databázi Scopus

2-s2.0-84955291083