| DOI: | 10.1038/s41561-021-00702-7
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| 论文题名: | Oceanic crustal flow in Iceland observed using seismic anisotropy |
| 作者: | Volk O.; White R.S.; Pilia S.; Green R.G.; Maclennan J.; Rawlinson N.
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| 刊名: | Nature Geoscience
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| ISSN: | 17520894
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| 出版年: | 2021
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| 卷: | 14, 期:3 | | 起始页码: | 168
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| 结束页码: | 173
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| 语种: | 英语
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| 英文关键词: | accretion
; crustal deformation
; deformation mechanism
; lower crust
; mantle plume
; observational method
; oceanic crust
; Rayleigh wave
; seismic anisotropy
; Iceland
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| 英文摘要: | Understanding accretion and deformation processes at mid-ocean ridges is crucial as they control the resulting oceanic crustal structure, which covers two-thirds of Earth’s surface. The most common tool for observing such dynamic processes within the Earth is seismic anisotropy. Iceland, which is uplifted by a convective mantle plume and has an active spreading ridge system exposed above sea level, offers a unique opportunity for studying this phenomenon. Here we use a high-resolution dataset of Love and Rayleigh wave speeds to constrain the seismic anisotropy in the Icelandic crust. We show that seismic anisotropy in the lower crust is controlled by crystal preferred orientation, providing a direct observation of lower crustal flow. Furthermore, since shear is needed to align the crystals, our results reveal that crustal flow cannot be a simple translation of mass and requires internal deformation. This finding suggests that crustal flow plays an important role in oceanic crustal accretion and deformation where thick, hot oceanic crust is formed, such as at volcanic rifted margins and where there are mantle plume–ridge interactions. © 2021, The Author(s), under exclusive licence to Springer Nature Limited. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/169828
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| Appears in Collections: | 气候变化与战略
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作者单位: | Department of Earth Sciences, Bullard Laboratories, University of Cambridge, Cambridge, United Kingdom; GeoForschungsZentrum Potsdam, Potsdam, Germany
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| Recommended Citation: | |
Volk O.,White R.S.,Pilia S.,et al. Oceanic crustal flow in Iceland observed using seismic anisotropy[J]. Nature Geoscience,2021-01-01,14(3)
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