A numerical and experimental investigation on seismic anisotropy of Finero peridotite, Ivrea-Verbano Zone, Northern Italy

17th International Conference on Textures of Materials

材料科学;物理学

Zhong, X.^1 ; Frehner, M.^2 ; Kunze, K.^3 ; Zappone, A.S.^4,5

Institute for Geochemistry and Petrology, ETH Zurich, Switzerland^1

Geological Institute, ETH Zurich, Switzerland^2

Scientific Centre for Optical and Electron Microscopy, ETH Zurich, Switzerland^3

Institute for Process Engineering, ETH Zurich, Switzerland^4

Swiss Seismological Service, Zurich, Switzerland^5

关键词: Crystallographic preferred orientations;    Electron back scatter diffraction;    Experimental investigations;    Mineral phasis;    Northern Italy;    Seismic anisotropy;    Serpentinization;    Ultrasonic P-wave velocity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/82/1/012072/pdf
DOI  :  10.1088/1757-899X/82/1/012072

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The Ivrea-Verbano Zone offers a unique opportunity to study lower crust/upper mantle rocks unaffected by serpentinization. Peridotites from Finero (North-East Ivrea-Verbano Zone) have been collected to investigate the influence of individual mineral phases on seismic anisotropy. The methods involve experimental ultrasonic P-wave velocity measurements using a hydrostatic pressure vessel, and electron backscatter diffraction (EBSD) analysis to investigate the crystallographic preferred orientation (CPO). CPO was analyzed by large area EBSD scans for major minerals including olivine, orthopyroxene, but also for metasomatic hornblende. The CPO of olivine is confirmed to be the major source of detected seismic anisotropy. Minor influence can arise from hornblende if it is sufficiently abundant.