Seismic evidence for a fossil mantle plume beneath South America and implications for plate driving forces
Seismic evidence for a fossil mantle plume beneath South America and implications for plate driving forces
复制标题
南美洲地幔柱化石的地震证据及其对板块驱动力的影响
DOI：
10.1038/378025a0
复制
发表时间：
1995
期刊：
影响因子：
64.8
通讯作者：
M. Assumpção
中科院分区：
文献类型：
--
作者：
J. VanDecar;D. James;M. Assumpção
一项远震旅行时研究揭示了巴西地下深部上地幔中存在一股化石羽流，尽管板块运动了数千公里，但它显然仍保持着相对于过度膨胀的大陆的地理上的固定。这一结果表明，自冈瓦瓦兰岛解体以来，南美洲的上地幔和岩石圈一直处于耦合状态，并可能为驱动大陆板块的长期存在的问题提供答案。
A teleseismic travel-time study reveals the presence of a fossil plume in the deep upper mantle beneath Brazil, which has apparently remained geographically fixed with respect to the overly-ing continent despite thousands of kilometres of plate motion. This result implies that the upper mantle and lithosphere beneath South America have remained coupled since the breakup of Gondwanaland and may provide an answer to the long-standing question of what forces drive continental plates.