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Crystallographic and shape preferred orientation producing anisotropy in slates from Northern Spain
Journal of Structural Geology ( IF 3.1 ) Pub Date : 2022-09-25 , DOI: 10.1016/j.jsg.2022.104730
H.-R. Wenk , J. Huang , M. Devoe , J. Gomez-Barreiro , R. Vasin , Y. Ren , S. Barrios-Sánchez

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.



中文翻译:

西班牙北部板岩的晶体学和形状择优取向产生各向异性

板岩是伊比利亚半岛常见的变沉积岩,沉积时代从元古代到奥陶纪。西班牙目前是优质板岩产品的主要生产国。优异的解理与白云母和绿泥石具有很强的择优取向的微观结构有关。在这项研究中,我们利用高能同步辐射 X 射线衍射探索了西班牙北部不同成分和变质等级的 11 块板岩和 1 块千枚岩的择优取向,并用扫描电子显微镜研究了微观结构。虽然页硅酸盐显示出高晶体学和形状优选取向,但具有高度扁平晶粒的石英在大多数样品中具有随机晶体学取向。微观结构和纹理数据用于通过自洽方法模拟各向异性地震特性,并探索晶体形状对弹性各向异性的影响。与片麻岩和页岩相比,这些板岩的各向异性非常高,并且由于其普遍存在,板岩的各向异性对上地壳的地震各向异性有显着贡献。

更新日期:2022-09-25
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