Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016GL071937 |
Limited true polar wander as evidence that Earth's nonhydrostatic shape is persistently triaxial | |
Steinberger, Bernhard1,2; Seidel, Miriam-Lisanne3; Torsvik, Trond H.1,2,4,5 | |
2017-01-28 | |
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:2 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; Norway; South Africa |
英文摘要 | Earth's spin axis follows the maximum moment of inertia axis of mantle convection, with some delay due to adjustment of the rotational bulge. Here we compute this axis for geodynamic models based on subduction history, assuming constant slab sinking speed, with another contribution due to thermochemical piles. For a wide range of parameters, a large shift of approximate to 90 degrees is predicted around 80-90Ma. It can be largely attributed to a change in circum-Pacific subduction from predominantly in the North and South toward East and West. Actual amounts of true polar wander are much smaller, pointing toward additional inertia tensor contributions, possibly due to slabs in the lowermost mantle below both polar regions. These slabs would have been subducted before approximate to 150Ma, when plate motions in the Panthalassa basin are largely unknown. Matching predicted and observed true polar wander can serve at constraining such plate motions. |
英文关键词 | subduction true polar wander |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000395652600028 |
WOS关键词 | ROTATIONAL STABILITY ; PLATE-TECTONICS ; MYR ; RECONSTRUCTIONS ; SUBDUCTION ; DYNAMICS ; MODELS ; AXIS ; TPW |
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/28703 |
专题 | 气候变化 |
作者单位 | 1.GFZ German Res Ctr Geosci, Sect Geodynam Modelling 2 5, Potsdam, Germany; 2.Univ Oslo, Ctr Earth Evolut & Dynam, Oslo, Norway; 3.Werner von Siemens Gymnasium, Berlin, Germany; 4.Geol Survey Norway NGU, Trondheim, Norway; 5.Univ Witwatersrand, Sch Geosci, Johannesburg, South Africa |
推荐引用方式 GB/T 7714 | Steinberger, Bernhard,Seidel, Miriam-Lisanne,Torsvik, Trond H.. Limited true polar wander as evidence that Earth's nonhydrostatic shape is persistently triaxial[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(2). |
APA | Steinberger, Bernhard,Seidel, Miriam-Lisanne,&Torsvik, Trond H..(2017).Limited true polar wander as evidence that Earth's nonhydrostatic shape is persistently triaxial.GEOPHYSICAL RESEARCH LETTERS,44(2). |
MLA | Steinberger, Bernhard,et al."Limited true polar wander as evidence that Earth's nonhydrostatic shape is persistently triaxial".GEOPHYSICAL RESEARCH LETTERS 44.2(2017). |
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