气候变化领域集成服务门户(CCPortal): Oceanic crustal flow in Iceland observed using seismic anisotropy

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DOI	10.1038/s41561-021-00702-7
	Oceanic crustal flow in Iceland observed using seismic anisotropy
	Volk O.; White R.S.; Pilia S.; Green R.G.; Maclennan J.; Rawlinson N.
发表日期	2021
ISSN	17520894
起始页码	168
结束页码	173
卷号	14 期号:3
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.
英文关键词	accretion; crustal deformation; deformation mechanism; lower crust; mantle plume; observational method; oceanic crust; Rayleigh wave; seismic anisotropy; Iceland
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206972
作者单位	Department of Earth Sciences, Bullard Laboratories, University of Cambridge, Cambridge, United Kingdom; GeoForschungsZentrum Potsdam, Potsdam, Germany
推荐引用方式 GB/T 7714	Volk O.,White R.S.,Pilia S.,et al. Oceanic crustal flow in Iceland observed using seismic anisotropy[J],2021,14(3).
APA	Volk O.,White R.S.,Pilia S.,Green R.G.,Maclennan J.,&Rawlinson N..(2021).Oceanic crustal flow in Iceland observed using seismic anisotropy.Nature Geoscience,14(3).
MLA	Volk O.,et al."Oceanic crustal flow in Iceland observed using seismic anisotropy".Nature Geoscience 14.3(2021).