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| DOI | 10.1016/j.tecto.2020.228524 |
| Seismic anisotropy of the Canadian High Arctic: Evidence from shear-wave splitting | |
| Dubé J.-M.; Darbyshire F.A.; Liddell M.V.; Stephenson R.; Oakey G. | |
| 发表日期 | 2020 |
| ISSN | 00401951 |
| 卷号 | 789 |
| 英文摘要 | The Canadian High Arctic preserves a long and complex tectonic history, including craton formation, multiple periods of orogenesis, extension and basin formation, and the development of a passive continental margin. We investigate the possible preservation of deformational structures throughout the High Arctic subcontinental lithosphere using measurements of seismic anisotropy from shear wave splitting at 11 seismograph stations across the region, including a N-S transect along Ellesmere Island. The majority of measurements indicate a fast-polarisation orientation that parallels tectonic trends and boundaries, suggesting that lithospheric deformation is the dominant source of seismic anisotropy in the High Arctic; however, a sub-lithospheric contribution cannot be ruled out. Beneath Resolute in the central Canadian Arctic, distinct back-azimuthal variations in splitting parameters can be explained by two anisotropic layers. The upper layer is oriented E–W and correlates with tectonic trends and the inferred lithospheric deformation history of the region. The lower layer has a ∼NNE–SSW orientation and may arise from present-day convective mantle flow beneath locally-thinned continental lithosphere. In addition to inferences of anisotropic structure beneath the Canadian High Arctic, measurements from the far north of our study region suggest the presence of an anisotropic zone in the lowermost mantle beneath northwest Alaska. © 2020 Elsevier B.V. |
| 关键词 | Canadian High ArcticLithospheric deformationSeismic anisotropyShear wave splitting |
| 英文关键词 | Anisotropy; Deformation; Lithology; Seismology; Shear flow; Structural geology; Tectonics; Anisotropic structure; Azimuthal variations; Canadian high arctic; Continental lithosphere; Lithospheric deformation; Passive continental margin; Seismograph stations; Shear wave splitting; Shear waves; continental margin; deformation; orogeny; S-wave; seismic anisotropy; seismic source; seismograph; tectonic evolution; tectonic setting; wave propagation; Canada; Ellesmere Island; Nunavut; Queen Elizabeth Islands |
| 语种 | 英语 |
| 来源期刊 | Tectonophysics
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/207738 |
| 作者单位 | Centre de recherche GEOTOP, Université du Québec à Montréal, CP 8888 succursale Centre-Ville, Montréal, QC H3C 3P8, Canada; Department of Physics, CCIS, University of Alberta, Edmonton, AB T6G 2E1, Canada; School of Geosciences, Geology and Geophysics, King's College, University of Aberdeen, Meston Building, Aberdeen, AB24 3UE, United Kingdom; Natural Resources Canada, 1 Challenger Drive, PO Box 1006, Dartmouth, NS B2Y 4A2, Canada |
| 推荐引用方式 GB/T 7714 | Dubé J.-M.,Darbyshire F.A.,Liddell M.V.,et al. Seismic anisotropy of the Canadian High Arctic: Evidence from shear-wave splitting[J],2020,789. |
| APA | Dubé J.-M.,Darbyshire F.A.,Liddell M.V.,Stephenson R.,&Oakey G..(2020).Seismic anisotropy of the Canadian High Arctic: Evidence from shear-wave splitting.Tectonophysics,789. |
| MLA | Dubé J.-M.,et al."Seismic anisotropy of the Canadian High Arctic: Evidence from shear-wave splitting".Tectonophysics 789(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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