The computer modeling of the physical mechanism of the 2D convective transport of hydrocarbons from the mantle wedge to the Earth’s surface: a comparison of the Newtonian and non-Newtonian rheology cases

Abstract For the non-Newtonian mantle rheology case the 2D thermal viscous dissipation-driven thermal convection in the mantle wedge above the Apulian lithospheric microplate subducting under the Euro-Asian plate is modeled numerically. The effects of the 410 km and 660 km phase transitions are taken into account. Within the framework of the model constructed the horizontal extent of the 2D heat flux anomaly observed in the rear of the Dinarides mountain belt corresponds to subduction velocity of ~10 mm per year which is close to that observed with the help of geodetic means. In the case of non-Newtonian rheology the upwelling convective flow transporting heat to the Earth’s surface locates at the distance from the trench corresponding to the actually observed 2D heat flux anomaly, the velocity in the convective vortices being from ~10 mm per year to ~10 m per year for the water content in the mantle wedge from 0.3´10 –1 to 3´10 –1 weight percent respectively. The convection cell dimension is of the order of the horizontal scale of the heat flux anomaly observed in the Pannonia petroleum basin and Vardar zone. Upwelling mantle wedge convective flow is indicated to be able to provide the mantle wedge hydrocarbons transport to the Earth’s surface for the mantle wedge mantle content over 0.3´10– 1 weight percent.

Keywords Computer Modeling, Thermal Convection, Newtonian & Non-Newtonian Rheology Cases.

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Engineering Journal: The computer modeling of the physical mechanism of the 2D convective transport of hydrocarbons from the mantle wedge to the Earth's surface: a comparison of the Newtonian and non-Newtonian rheology cases

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