3D velocity distribution of P- and S-waves in a biotite gneiss, measured in oil as the pressure medium: Comparison with velocity measurements in a multi-anvil pressure apparatus and with texture-based calculated data

Lokajı́ček, T.; Kern, H.; Svítek, T.; Ivankina, T. I.

doi:10.1016/j.pepi.2014.04.002

Cited by 20 publications

(16 citation statements)

References 21 publications

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“…This method was recently refined to allow simultaneous measurement of P and S waves in arbitrary directions at hydrostatic pressures up to 2 R.N. Vasin et al 100 MPa (Lokajíček et al 2014). Here we follow up on previous work where elastic wave velocities have been measured on spheres and cubes (e.g.…”

Section: Introductionmentioning

confidence: 99%

Elastic anisotropy of Tambo gneiss from Promontogno, Switzerland: a comparison of crystal orientation and microstructure-based modeling and experimental measurements

et al. 2017

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Felsic and mafic gneisses constitute large proportions of the upper and lower continental crust. Gneisses often display high anisotropy of elastic properties associated with preferred orientations of sheet silicates. Here we study the elastic anisotropy of a sample of Tambo gneiss from Promontogno in the Central Alps. We apply optical microscopy, time-of-flight neutron diffraction, neutron and X-ray tomography to quantify mineral composition and microstructures and use them to construct self-consistent models of elastic properties. They are compared to results of ultrasonic measurements on a cube sample in a multi-anvil apparatus and on a spherical sample in an apparatus that can measure velocities in multiple directions. Both methods provide similar results. It is shown that models of microstructure-derived elastic properties provide a good match with ultrasonic experiment results at pressures above 100 MPa. At a pressure of 0.1 MPa the correspondence between the model and the experiment is worse. This may be caused by an oversimplification of the model with respect to microfractures or uncertainties in the experimental determination of S-wave velocities and elastic tensor inversion. The study provides a basis to determine anisotropic elastic properties of rocks either by ultrasonic experiments or quantitative models based on microstructures. This information can then be used for interpretation of seismic data of the crust.

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Section: Introductionmentioning

confidence: 99%

Elastic anisotropy of Tambo gneiss from Promontogno, Switzerland: a comparison of crystal orientation and microstructure-based modeling and experimental measurements

et al. 2017

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“…For a more detailed description of the measuring procedure, see Lokajíček et al . [] and Lokajíček and Svitek [].…”

Section: Sample Experimental Techniques and Resultsmentioning

confidence: 99%

“…Shear wave velocities measured on the sphere are systematically lower than those measured on the cube. Similar observations were already made on a foliated biotite gneiss from Outokumpu [ Lokajíček et al ., ]. The differences are probably due to the differences in the geometry of the samples with flat surfaces for cube and curved surfaces for sphere, with limitations for the transducer‐sample assembly.…”

Section: Discussionmentioning

confidence: 99%

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Seismic anisotropy of serpentinite from Val Malenco, Italy

et al. 2015

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Serpentinites, deformed in mantle subduction zones, are thought to contribute significantly to seismic anisotropy of the upper mantle and have therefore been of great interest with studies on deformation, preferred orientation, and elastic properties. Here we present a combined study of a classical sample from Val Malenco, Italy, investigating the microstructure and texture with state‐of‐the art synchrotron X‐ray and neutron diffraction methods and measuring ultrasonic velocities both with a multi‐anvil apparatus and a novel instrument to measure 3‐D velocities on spheres. Both, results from diffraction methods and velocity measurements are compared, discussing advantages and disadvantages. From spherical velocities, elastic tensor properties can be derived by inversion. Also from quantitative texture measurements, elastic properties can be modeled by self‐consistent averaging. Good agreement between the velocity and microstructural models is observed.

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“…In the first case the neutron diffraction gave the best results [Ivankina et al, 2005;Lokajicek et al, 2014;Barreiro et al, 2015] while in the second case the image analysis of thin section or -computed tomography ( -CT) are preferred [Jerram and Higgins, 2007]. The information provided by these methods are rather complementary as the neutron diffraction data refer to the mineral lattices CPO while the optical methods evidence only Figure 2.…”

Section: Introductionmentioning

confidence: 99%

\baselineskip =13pt Orientation distribution function of biotite platelets based on optical, thin sections and $\mu $-CT image analysis in an Outokumpu (Finland) biotite gneiss: Comparison with neutron diffraction texture analysis

Duliu¹,

Ivankina²,

Herman³

et al. 2016

Russ. J. Earth Sci.

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The results of the neutron diffraction investigation were compared with similar results obtained by analysing more -CT, high resolution photographic and thin section images of a cylindrical sample of the textured Outokumpu (Finland) biotite gneiss. All data were interpreted by means of corresponding orientation distribution function (ODF). Both Rayleigh test of uniformity and Rao's test for homogeneity of the corresponding ODF confirmed the existence of a real anisotropic distribution of mineralogical phases within investigated specimens. Together with the neutron diffraction pole figures, ODF, unambiguously proved the existence of a lattice as well as of the shape preferred orientations of the mineralogical components of the complex Outokumpu gneiss. KEYWORDS: Outokumpu; mica gneiss; neutron diffraction; computed tomography; foliation; lineation; orientation distribution function.

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3D velocity distribution of P- and S-waves in a biotite gneiss, measured in oil as the pressure medium: Comparison with velocity measurements in a multi-anvil pressure apparatus and with texture-based calculated data

Cited by 20 publications

References 21 publications

Elastic anisotropy of Tambo gneiss from Promontogno, Switzerland: a comparison of crystal orientation and microstructure-based modeling and experimental measurements

Elastic anisotropy of Tambo gneiss from Promontogno, Switzerland: a comparison of crystal orientation and microstructure-based modeling and experimental measurements

Seismic anisotropy of serpentinite from Val Malenco, Italy

\baselineskip =13pt Orientation distribution function of biotite platelets based on optical, thin sections and $\mu $-CT image analysis in an Outokumpu (Finland) biotite gneiss: Comparison with neutron diffraction texture analysis

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