THREE-DIMENSIONAL NUMERICAL SIMULATIONS OF CRUSTAL DEFORMATION AND SUBCONTINENTAL MANTLE CONVECTION
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dc.contributor.author | Moresi L.N. | |
dc.contributor.author | Lenardic A. | |
dc.date.accessioned | 2020-12-13T04:29:21Z | |
dc.date.available | 2020-12-13T04:29:21Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=31715721 | |
dc.identifier.citation | Earth and Planetary Science Letters, 1997, , 3, 233-243 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20650 | |
dc.description.abstract | 3-D simulations of mantle convection allowing for continental crust are explored to study the effects of crustal thickening on lithosphere stability and of continents on large-scale mantle flow. Simulations begin with a crustal layer within the upper thermal boundary layer of a mantle convection roll in a 1 × 1 × 1 Cartesian domain. Convective stresses cause crust to thicken above a sheet-like mantle downwelling. For mild convective vigor an initial crustal thickness variation is required to induce 3-D lithospheric instability below the zone of crustal convergence. The amplitude of the required variation decreases with increasing convective vigor. Morphologically, instability is manifest in formation of drip-like thermals that exist within the large-scale roll associated with initial crustal thickening. A strong surface signature of the drips is their ability to cause deviations from local Airy compensation of topography. After the initial thickening phase, the crustal accumulation that forms serves as a model analog to a continent. Its presence leads to mantle flow patterns distinctly different from the steady-state roll that results in its absence. Large lateral thermal gradients are generated at its edge allowing this region to be the initiation site for continued small-scale thermal instabilities. Eventually these instabilities induce a restructuring of large-scale mantle flow, with the roll pattern being replaced by a square cell. Although preliminary and idealized, the simulations do show the fluid dynamical plausibility behind the idea that significant mantle variations can be generated along the strike of a largely 2-D mountain chain by the formation of the chain itself. The ability of a model continent to cause a change in fundamental convective planform also suggests that the effects of continental crust on mantle convection may be low-order despite the seemingly trivial volume of crust relative to mantle. | |
dc.title | THREE-DIMENSIONAL NUMERICAL SIMULATIONS OF CRUSTAL DEFORMATION AND SUBCONTINENTAL MANTLE CONVECTION | |
dc.type | Статья |
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