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

Crystallographic and shape preferred orientation producing anisotropy in slates from Northern Spain
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西班牙北部板岩的晶体学和形状择优取向产生各向异性

DOI:
10.1016/j.jsg.2022.104730
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发表时间:
2022
影响因子:
3.1
通讯作者:
Barrios-Sánchez, S.
Barrios-Sánchez, S.
中科院分区:
地球科学2区
文献类型:
--
作者:
Wenk, H.-R.;Huang, J.;Devoe, M.;Gómez-Barreiro, J.;Vasin, R.;Ren, Y.;Barrios-Sánchez, S.

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板岩是伊比利亚半岛常见的变质沉积岩,沉积时代从元古界到奥陶纪不等。西班牙目前是高质量板岩产品的主要生产国。这种良好的解理作用与白云母和绿泥石具有很强择优取向的微观结构有关。本文用高能同步辐射X射线衍射仪研究了西班牙北部11个不同成分和变质程度的板岩和1个千枚岩的择优取向,并用扫描电子显微镜研究了它们的显微结构。层状硅酸盐显示出高度的结晶学和形状择优取向,而石英,也具有高度扁平的颗粒,在大多数样品中具有随机的晶体取向。利用显微构造和纹理数据,用自洽方法模拟各向异性地震性质,并探讨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,由于其普遍存在,板岩各向异性对上地壳的地震各向异性有很大的贡献。
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.
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发表时间: 1998
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影响因子: 1.5
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