Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1038/s41561-019-0325-7 |
Ubiquitous lower-mantle anisotropy beneath subduction zones | |
Ferreira, Ana M. G.1,2; Faccenda, Manuele3; Sturgeon, William2; Chang, Sung-Joon4; Schardong, Lewis2,5 | |
2019-04-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2019 |
卷号 | 12期号:4页码:301-+ |
文章类型 | Article |
语种 | 英语 |
国家 | Portugal; England; Italy; South Korea; Israel |
英文摘要 | Seismic anisotropy provides key information to map the trajectories of mantle flow and understand the evolution of our planet. While the presence of anisotropy in the uppermost mantle is well established, the existence and nature of anisotropy in the transition zone and uppermost lower mantle are still debated. Here we use three-dimensional global seismic tomography images based on a large dataset that is sensitive to this region to show the ubiquitous presence of anisotropy in the lower mantle beneath subduction zones. Whereas above the 660 km seismic discontinuity slabs are associated with fast SV anomalies up to about 3%, in the lower mantle fast SH anomalies of about 2% persist near slabs down to about 1,000-1,200 km. These observations are consistent with 3D numerical models of deformation from subducting slabs and the associated lattice-preferred orientation of bridgmanite produced in the dislocation creep regime in areas subjected to high stresses. This study provides evidence that dislocation creep may be active in the Earth's lower mantle, providing new constraints on the debated nature of deformation in this key, but inaccessible, component of the deep Earth. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000462621700017 |
WOS关键词 | EARTHS LOWER MANTLE ; SEISMIC ANISOTROPY ; SHEAR VELOCITY ; RADIAL ANISOTROPY ; CLUSTER-ANALYSIS ; DEFORMATION ; CRUSTAL ; MODEL ; BRIDGMANITE ; TOMOGRAPHY |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/182203 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Univ Lisbon, Inst Super Tecn, CERIS, Lisbon, Portugal; 2.UCL, Fac Math & Phys Sci, Dept Earth Sci, London, England; 3.Univ Padua, Dipartimento Geosci, Padua, Italy; 4.Kangwon Natl Univ, Div Geol & Geophys, Chunchon, South Korea; 5.Tel Aviv Univ, Dept Geophys & Planetary Sci, Tel Aviv, Israel |
推荐引用方式 GB/T 7714 | Ferreira, Ana M. G.,Faccenda, Manuele,Sturgeon, William,et al. Ubiquitous lower-mantle anisotropy beneath subduction zones[J]. NATURE GEOSCIENCE,2019,12(4):301-+. |
APA | Ferreira, Ana M. G.,Faccenda, Manuele,Sturgeon, William,Chang, Sung-Joon,&Schardong, Lewis.(2019).Ubiquitous lower-mantle anisotropy beneath subduction zones.NATURE GEOSCIENCE,12(4),301-+. |
MLA | Ferreira, Ana M. G.,et al."Ubiquitous lower-mantle anisotropy beneath subduction zones".NATURE GEOSCIENCE 12.4(2019):301-+. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论