气候变化领域集成服务门户(CCPortal): Crystallographic preferred orientation, seismic velocity and anisotropy in roofing slates

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DOI	10.1016/j.tecto.2021.228815
	Crystallographic preferred orientation, seismic velocity and anisotropy in roofing slates
	Cardenes V.; Lopez-Sanchez M.A.; Barou F.; Olona J.; Llana-Fúnez S.
发表日期	2021
ISSN	00401951
卷号	808
英文摘要	Mica-rich rocks (shales, slates, schists) are a major and significant component of the continental crust. They are often characterized by a strong seismic anisotropy, a key factor in the seismic interpretation of the architecture of the continental crust. Roofing slates are a group of natural rocks used in construction that must possess a continuous and undeformed slaty cleavage. This makes roofing slates an exceptional benchmark to study the relation between the rock microstructure and the development of seismic anisotropy in single-foliated low-grade slates. Direct measurements of seismic velocities using an ultrasonic wavemeter at room conditions were done on eight cubic samples from active quarries in the NW Iberian Peninsula. Seismic velocities were also calculated using the Hill averaging method from crystallographic preferred orientation (CPO) maps of slate-forming minerals on the same sample blocks using electron backscatter diffraction (EBSD), achieving unprecedented coverages of up to 87%. The seismic velocities estimated by both methods are similar parallel to the slaty cleavage but much slower using direct measures in the axial direction, producing anisotropies for Vp and Vs1 up to 7 and 5 times higher than the calculated velocities. The results are indicative of the highly anisotropic contribution that cracks, pores and fractures have in single-foliated slates, given the strong shape fabric that the rocks present. The samples selected also show that not all slates exhibit near-transverse isotropy, as it has been commonly assumed. © 2021 Elsevier B.V.
关键词	Crystallographic Preferred Orientation Phyllosilicates Seismic anisotropy Seismic velocity Slate Tectonite
英文关键词	Anisotropy; Crystallography; Mica; Roofs; Seismic waves; Seismology; Velocity; Continental crusts; Crystallographic preferred orientations; Direct measurement; Electron back scatter diffraction; Pores and fractures; Rock microstructure; Seismic interpretation; Transverse isotropy; Slate; continental crust; crystallography; data interpretation; phyllosilicate; seismic anisotropy; seismic velocity; slate; tectonic evolution; Iberian Peninsula
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/207952
作者单位	Geology Department, Oviedo University, C/ Jesús Arias de Velasco s/n, Oviedo, Asturias 33005, Spain; Géosciences Montpellier, Université de Montpellier & CNRS, Place E. Bataillon, Cedex 5, Montpellier 34095, France
推荐引用方式 GB/T 7714	Cardenes V.,Lopez-Sanchez M.A.,Barou F.,et al. Crystallographic preferred orientation, seismic velocity and anisotropy in roofing slates[J],2021,808.
APA	Cardenes V.,Lopez-Sanchez M.A.,Barou F.,Olona J.,&Llana-Fúnez S..(2021).Crystallographic preferred orientation, seismic velocity and anisotropy in roofing slates.Tectonophysics,808.
MLA	Cardenes V.,et al."Crystallographic preferred orientation, seismic velocity and anisotropy in roofing slates".Tectonophysics 808(2021).