Transition zone structure under a stationary hot spot: Cape Verde

被引：21
|
作者：
Helffrich, George [1 ]
Faria, Bruno [2 ,3 ]
Fonseca, Joao F. B. D. [3 ,4 ]
Lodge, Alexandra [1 ]
Kaneshima, Satoshi [5 ]
机构：
[1] Univ Bristol, Bristol BS8 1RJ, Avon, England
[2] Inst Nacl Meteorol & Geofis, S Vicente, Cape Verde
[3] Inst Super Tecn, Dept Phys, P-1049001 Lisbon, Portugal
[4] Inst Super Tecn, ICIST, P-1049001 Lisbon, Portugal
[5] Tokyo Inst Technol, Meguro Ku, Tokyo 1528551, Japan
来源：
EARTH AND PLANETARY SCIENCE LETTERS | 2010年 / 289卷 / 1-2期
关键词：
Cape Verde; hot spot; transition zone; receiver function; MANTLE PLUMES; HOTSPOTS; TOPOGRAPHY; BENEATH;
D O I：
10.1016/j.epsl.2009.11.001
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
We report on a two-year seismic deployment in the Cape Verde Islands, one goal of which was to study the upper mantle to determine its structure under a hot spot that is stationary in the hot spot reference frame. We find from analysis of P-to-S receiver functions estimated from broadband seismic recordings that, within uncertainty, the time separation between the 410 and 660 km discontinuities is normal compared to radial earth models. Thus, to exist, even stationary hot spots do not require vertical thermal anomalies from deep melting sources anchored in the lower mantle or at the core-mantle boundary or their anomalies are narrower than similar to 250 km in the upper mantle. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：156 / 161
页数：6
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