Initially some analytical models were developed to understand the process of convection in the mantle. However the complexity of the structure dependence of rock properties on pressure and temperature and grain-size effects, distribution of plate boundaries. presence of heterogeneous boundary layers, etc...
The K/U ratio of the silicate Earth: Insights into mantle composition, structure and thermal evolution The abundance of K in the silicate Earth provides control on the composition of the Earth's interior, the dominant mode of mantle convection, the thermal e... R Arevalo,WF Mcdonough,M Luong...
THE concept of crustal plate motion over mantle hotspots has been advanced1to explain the origin of the Hawaiian and other island chains and the origin of the Walvis, Iceland-Farroe and other aseismic ridges. More recently the pattern of the aseismic ridges has been used in formulating continent...
Large-scale heterogeneities in the lower mantle Seismology: Structure of the Earth's interior below the upper mantleTectonophysics: Convection currentsCoefficients of a spherical harmonic expansion, up to ... AM Dziewonski,BH Hager,RJ O'Connell - 《Journal of Geophysical Research Atmospheres》 被引...
Physical processes (subduction, convection) affect the chemistry of the mantle. Chemical processes occur mainly through melting. Resulting chemical differences are acted upon by physical processes. Interaction physical-chemical state of the mantle. ...
We have assumed that convection currents in the Earth’s mantle are the motive force for the lithosphere. The geological literature has often invoked such currents, each time endowing them with the peculiar properties required for the problem at hand, without stating explicitly their general characte...
What causes convection currents in the mantle?Earth's LayersThe Earth is not just one big, solid ball. Rather, it is made up of several distinct layers. At the center is the inner core; surrounding this is the outer core. The thickest layer is the mantle, and the outermost layer is ...
Recently published a priori analyses of the mantle convection process demonstrate that the influence of the endothermic phase transformation at 660 km depth could be profound and such as to enforce a strongly intermittent style of circulation. In this phase-transition modulated regime, mass transfer ac...
It is noted that thermal convection in the whole mantle has a finite amplitude. The intensity of upper mantle convection is considered high enough to create areas where the total temperature decreases with the depth. The time necessary to reach a steady state for convection in the lower mantle,...
Seismic heterogeneity in the lower mantle suggests large-scale convection, which is perhaps driven by heat from the earth's core. Plate motions may interact with large-scale flow in the mantle, and are probably not completely decoupled from flow in the lower mantle. Lateral variations in flow ...