ULTRAFAST UPWELLING BURSTING THROUGH THE UPPER MANTLE
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dc.contributor.author | Larsen T.B. | |
dc.contributor.author | Yuen D.A. | |
dc.date.accessioned | 2020-12-14T10:49:46Z | |
dc.date.available | 2020-12-14T10:49:46Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=267704 | |
dc.identifier.citation | Earth and Planetary Science Letters, 1997, , 3, 393-399 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20766 | |
dc.description.abstract | A high-resolution calculation of strongly time-dependent thermal convection in the upper mantle with non-Newtonian, temperature-dependent rheology shows that, for an effective Rayleigh number of around 106, extremely fast upwellings, at times exceeding 10 m/yr, can be generated a few hundred kilometers below the lithosphere. There is a clear separation of timescales between this fast jet and the more slowly convecting mantle. Within this fast vertical shear layer is embedded a thermal boundary layer with a width of the order of 50 km. The development of the fast non-Newtonian upwelling is characterized by the growth of the plume head to a large enough size, before the plume takes off rapidly at a depth of around 350 km. Upon impinging the base of the lithosphere, this fast plume thins the lithosphere and the flow then becomes a horizontally moving hot sheet, extending out for around 1000 km. This scenario is found to repeat itself at the same location about 10 Myr after the first plume impingement. | |
dc.subject | UPPER MANTLE | |
dc.subject | UPWELLING | |
dc.subject | PLUMES | |
dc.subject | MODELS | |
dc.subject | CONVECTION | |
dc.title | ULTRAFAST UPWELLING BURSTING THROUGH THE UPPER MANTLE | |
dc.type | Статья |
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