The uppermost mantle beneath the Kenya dome and relation to melting, rifting and uplift in East Africa
The uppermost mantle beneath the Kenya dome and relation to melting, rifting and uplift in East Africa
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DOI：
10.1029/2001gl013676
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发表时间：
2002-04
影响因子：
5.2
通讯作者：
P. Davis;P. D. Slack
中科院分区：
文献类型：
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作者：
P. Davis;P. D. Slack
我们比较了S波延迟和P波层析成像的新结果，以表征肯尼亚圆顶下推断的地幔对流单体的上升翼和熔融区。这些结果扩展到尼拉贡戈和埃塞俄比亚圆顶使用长波长重力和地形。我们认为，东非裂谷的结果从更深的地幔上涌到三个电流的冲击和侵蚀岩石圈的基础分离。它们的热浮力驱动穹隆隆起，而岩石圈上部的脆性破坏形成裂谷地堑。
We compare new results on S‐wave delays and P wave tomography to characterize the rising limb and melt zone of an inferred mantle convection cell beneath the Kenya dome. These results are extended to the Nyiragongo and Ethiopia domes using long wavelength gravity and topography. We suggest that the east African rift results from separation of deeper mantle upwelling into three currents that impinge on and erode the base of the lithosphere. Their thermal buoyancy drives the domal uplift, whereas brittle failure of the upper lithosphere forms the rift grabens.