A SELF-CONSISTENT 2-D MODEL FOR THE DIP ANGLE OF MANTLE DOWNFLOW BENEATH AN OVERRIDING CONTINENT
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dc.contributor.author | Trubitsyn V.P. | |
dc.contributor.author | Rykov V.V. | |
dc.contributor.author | Jacoby W.R. | |
dc.date.accessioned | 2021-01-11T07:57:16Z | |
dc.date.available | 2021-01-11T07:57:16Z | |
dc.date.issued | 1999 | |
dc.identifier | https://elibrary.ru/item.asp?id=13316006 | |
dc.identifier.citation | Journal of Geodynamics, 1999, , 2, 215-224 | |
dc.identifier.issn | 0264-3707 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/22658 | |
dc.description.abstract | We demonstrate how the inclination of descending mantle flow is affected by thepresence of a continent overriding the downwelling zone. The mantle is modelled by a fluidhaving a temperature- and pressure-dependent viscosity which describes a low viscosityasthenosphere and a higher viscosity lower mantle. The fluid occupies a square x:y=10:1 boxheated from below. In the absence of overlying continents thermal convection sets in with colddownwellings being nearly vertical. A continent is placed on the convecting mantle and starts todrift. The continent is assumed to be a thick rigid plate. We consider models of two types. Model1 involves a free-floating continent. The continent is pulled by viscous forces and approaches acold downwelling nearby. Interactions between the convective mantle and the drifting continentlead to an inclined downwelling zone. Model 2 involves a continent moving horizontally with agiven velocity. When the continent approaches a downwelling, it alters the flow and causes thedownwelling to deviate from the vertical. The dip angle of the downflow depends on the velocityof the overriding continent and can take values ranging from 0 to 90 degrees. | |
dc.title | A SELF-CONSISTENT 2-D MODEL FOR THE DIP ANGLE OF MANTLE DOWNFLOW BENEATH AN OVERRIDING CONTINENT | |
dc.type | Статья |
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