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首页> 外文期刊>South African journal of geology >The African Plate
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The African Plate

机译：非洲板块

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The entire African Plate in both its continental and oceanic areas has evolved in distinctive and unusual ways over the past roughly 30 million years. I attribute these peculiarities to the African Plate having come to rest with respect to at least part of the convective circulation in the underlying mantle. On the grandest scale interaction has produced a plate-wide structure of basins and swells with wavelengths ranging from 200 to 2000 km, and a common above average elevation of both the land surface and the ocean floor. Denudation of the swell areas on land has generated escarpments and extensive erosion surfaces, and has resulted in rapid progradation of the deltas of those of the continent's great rivers which reach the sea. During a preceding interval lasting from at least 65 to about 30 Ma, Africa was a low-lying continent with widespread deep weathering. Igneous activity, apart from that generated by the Tristan and Deccan plumes, was continuous only in an area in Cameroon.
机译：在过去的大约三千万年中，整个非洲板块在其大陆和海洋地区都以独特而不同寻常的方式演变。我将这些特殊性归因于非洲板块至少在下地幔的对流环流中已经停止。在最大尺度上，相互作用产生了一个全盘状的盆地和隆起结构，其波长范围为200至2000 km，并且陆地和海床的海拔均高于平均水平。陆地上的隆起区的剥蚀产生了悬崖和广泛的侵蚀面，并导致了到达海洋的大陆大河的三角洲的迅速发展。在从至少65 Ma到大约30 Ma的持续时间间隔中，非洲是一个地势低洼的大陆，广泛的深层风化。除了特里斯坦和德干羽流产生的火成岩活动，仅在喀麦隆的某个地区是连续的。

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