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- W2007304281 abstract "Continental splitting is the response of the continental lithosphere, under favourable conditions, to deviatoric tension and a hot, partially fused upper mantle beneath. It has commonly been suggested that rift systems such as that of East Africa may possibly represent splitting in the process of occurring. Here, the hot upper mantle has probably formed by convective upwelling from deep in the mantle, allowing the escape of heat from the Earth's interior by hotspot activity. This causes volcanism and isostatic uplift of the heated and thinned lithosphère, and the crustal tension subsequently develops in response to the surface load caused by the uplift and the upthrust of the isostatic compensation at depth. It is suggested here that the crustal tension causing continental splitting does not normally originate as in East Africa, but rather by the suction force acting on the overriding plates at trenches at periods in Earth history when subduction occurs on the opposite sides of a large continental mass such as Pangaea. The critical evidence on the splitting mechanism is mostly deeply buried at passive margins and inaccessible to study. Some margins such as the north Biscay one were apparently formed under much quieter volcanic and tectonic conditions than continental rift zones, whereas others such as those of the Icelandic region underwent extensive continental volcanism indicating a hot upper mantle beneath. The Icelandic types of margin probably acted as foci for continental splitting by dyke emplacement, with dykes propagating laterally from them through the more quietly developed parts of the margin to link with existing plate boundaries. Normal plate motions occur in response to the steady escape of heat from the deep interior through formation and cooling of the oceanic lithosphere which can be recycled, whereas continental splitting is seen as the result of the spasmodic escape of heat from the deep interior through the continental lithosphere." @default.
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- W2007304281 title "The mechanism of continental splitting" @default.
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- W2007304281 doi "https://doi.org/10.1016/0040-1951(82)90134-2" @default.
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