Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017GL074769 |
Shallow Mantle Anisotropy Beneath the Juan de Fuca Plate | |
VanderBeek, Brandon P.; Toomey, Douglas R. | |
2017-11-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:22 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The anisotropic fabric of the oceanic mantle lithosphere is often assumed to parallel paleo-relative plate motion (RPM). However, we find evidence that this assumption is invalid beneath the Juan de Fuca (JdF) plate. Using travel times of seismic energy propagating through the topmost mantle, we find that the fast direction of P wave propagation is rotated 18 degrees +/- 3 degrees counterclockwise to the paleo-spreading direction and strikes between Pacific-JdF relative and JdF absolute plate motion (APM). The mean mantle velocity is 7.85 +/- 0.02 km/s with 4.6% +/- 0.4% anisotropy. Synthesis of the plate-averaged Pn anisotropy signal with measurements of Pn anisotropy beneath the JdF Ridge and SKS splits across the JdF plate suggests that the anisotropic structure of the topmost mantle continues to evolve away from the spreading center to more closely align with APM. We infer that the oceanic mantle lithosphere may record the influence of both paleo-RPM and paleo-APM. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000419102300019 |
WOS关键词 | LATTICE PREFERRED ORIENTATION ; EAST PACIFIC RISE ; SEISMIC ANISOTROPY ; SEA-FLOOR ; OCEANIC LITHOSPHERE ; UPPERMOST MANTLE ; SIMPLE SHEAR ; OLIVINE CPO ; EVOLUTION ; WAVES |
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/27653 |
专题 | 气候变化 |
作者单位 | Univ Oregon, Dept Earth Sci, Eugene, OR 97403 USA |
推荐引用方式 GB/T 7714 | VanderBeek, Brandon P.,Toomey, Douglas R.. Shallow Mantle Anisotropy Beneath the Juan de Fuca Plate[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(22). |
APA | VanderBeek, Brandon P.,&Toomey, Douglas R..(2017).Shallow Mantle Anisotropy Beneath the Juan de Fuca Plate.GEOPHYSICAL RESEARCH LETTERS,44(22). |
MLA | VanderBeek, Brandon P.,et al."Shallow Mantle Anisotropy Beneath the Juan de Fuca Plate".GEOPHYSICAL RESEARCH LETTERS 44.22(2017). |
条目包含的文件 | 条目无相关文件。 |
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