Crystallographic and shape preferred orientation producing anisotropy in slates from Northern Spain

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

1 Scopus Citations
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Author(s)

  • H.-R. Wenk
  • J. Huang
  • M. Devoe
  • J. Gómez-Barreiro
  • R. Vasin
  • S. Barrios-Sánchez

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number104730
Journal / PublicationJournal of Structural Geology
Volume164
Online published25 Sept 2022
Publication statusPublished - Nov 2022

Abstract

Slates are common metasedimentary rocks in the Iberian Peninsula, ranging in deposition age from Proterozoic to Ordovician. Spain is currently the primary producer of high-quality slate products. The excellent cleavage is related to microstructures with very strong preferred orientation of white mica and chlorite. In this study we explore preferred orientation of eleven slates and one phyllite of different composition and metamorphic grade from Northern Spain with high energy synchrotron X-ray diffraction and study microstructures with scanning electron microscopy. While phyllosilicates display high crystallographic and shape preferred orientation, quartz, with also highly flattened grains, has in most samples a random crystallographic orientation. The microstructural and texture data are used to model anisotropic seismic properties with a self-consistent method and to explore the influence of crystal shapes on elastic anisotropy. Anisotropy for these slates is very high compared with gneiss and shale and, due to its prevalence, slate anisotropy contributes significantly to seismic anisotropy in the upper crust.

Research Area(s)

  • Crystallographic and shape preferred orientation, Microstructure, Northern Spain, Seismic anisotropy, Slate

Citation Format(s)

Crystallographic and shape preferred orientation producing anisotropy in slates from Northern Spain. / Wenk, H.-R.; Huang, J.; Devoe, M. et al.
In: Journal of Structural Geology, Vol. 164, 104730, 11.2022.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review