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DOI | 10.1002/2017GL074312 |
Mantle flow through a tear in the Nazca slab inferred from shear wave splitting | |
Lynner, Colton1; Anderson, Megan L.2; Portner, Daniel E.1; Beck, Susan L.1; Gilbert, Hersh3 | |
2017-07-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:13 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Canada |
英文摘要 | A tear in the subducting Nazca slab is located between the end of the Pampean flat slab and normally subducting oceanic lithosphere. Tomographic studies suggest mantle material flows through this opening. The best way to probe this hypothesis is through observations of seismic anisotropy, such as shear wave splitting. We examine patterns of shear wave splitting using data from two seismic deployments in Argentina that lay updip of the slab tear. We observe a simple pattern of plate-motion-parallel fast splitting directions, indicative of plate-motion-parallel mantle flow, beneath the majority of the stations. Our observed splitting contrasts previous observations to the north and south of the flat slab region. Since plate-motion-parallel splitting occurs only coincidentally with the slab tear, we propose mantle material flows through the opening resulting in Nazca plate-motion-parallel flow in both the subslab mantle and mantle wedge. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000406257400031 |
WOS关键词 | SEISMIC ANISOTROPY ; SOUTH-AMERICA ; PUNA PLATEAU ; OLIVINE CPO ; SUBDUCTION ; FLAT ; EVOLUTION ; TRANSITION ; DYNAMICS ; INSIGHTS |
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/25882 |
专题 | 气候变化 |
作者单位 | 1.Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA; 2.Colorado Coll, Dept Geol, Colorado Springs, CO 80903 USA; 3.Univ Calgary, Dept Geosci, Calgary, AB, Canada |
推荐引用方式 GB/T 7714 | Lynner, Colton,Anderson, Megan L.,Portner, Daniel E.,et al. Mantle flow through a tear in the Nazca slab inferred from shear wave splitting[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(13). |
APA | Lynner, Colton,Anderson, Megan L.,Portner, Daniel E.,Beck, Susan L.,&Gilbert, Hersh.(2017).Mantle flow through a tear in the Nazca slab inferred from shear wave splitting.GEOPHYSICAL RESEARCH LETTERS,44(13). |
MLA | Lynner, Colton,et al."Mantle flow through a tear in the Nazca slab inferred from shear wave splitting".GEOPHYSICAL RESEARCH LETTERS 44.13(2017). |
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