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- W2033891379 abstract "The emplacement of kimberlites in the North American and African continents since the early Palaeozoic appears to have occurred during periods of relatively slow motion of these continents. The distribution of kimberlites in time may reflect the global pattern of convection, which forces individual plates to move faster or slower at different times. Two-dimensional numerical experiments on a convecting layer with a moving upper boundary show two different regimes: in the first, when the upper boundary velocity is high, heat is transferred by the large-scale circulation and in the second, when the upper boundary velocity is lower, heat is predominantly transferred by thermal plumes rising from the lower boundary layer. For a reasonable mantle solidus, this second regime can give rise to partial melting beneath the moving plate, far from the plate boundaries. The transition between these modes takes place over a small range of plate velocities; for a Rayleigh number of 106 it occurs around 20 mm yr−1. We suggest that the generation of kimberlite magmas may result from thermal plumes incident on the base of a slowly moving plate." @default.
- W2033891379 created "2016-06-24" @default.
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- W2033891379 date "1984-01-01" @default.
- W2033891379 modified "2023-10-14" @default.
- W2033891379 title "On the geodynamic setting of kimberlite genesis" @default.
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- W2033891379 doi "https://doi.org/10.1016/0012-821x(84)90043-8" @default.
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