globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2021.228815
论文题名:
Crystallographic preferred orientation, seismic velocity and anisotropy in roofing slates
作者: Cardenes V.; Lopez-Sanchez M.A.; Barou F.; Olona J.; Llana-Fúnez S.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 808
语种: 英语
中文关键词: 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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170785
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Cardenes V.,Lopez-Sanchez M.A.,Barou F.,et al. Crystallographic preferred orientation, seismic velocity and anisotropy in roofing slates[J]. Tectonophysics,2021-01-01,808
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