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  • Quantitative analysis of X-ray microtomography images of geomaterials [Elektronski vir] : application to volcanic rocks
    Zandomeneghi, D. ...
    X-ray computed microtomography is an excellent tool for the three-dimensional analy- sis of rock microstructure. Digital images are acquired, visualized, and processed to iden- tify and measure ... several discrete features and constituents of rock samples, by means of mathematical algorithms and computa- tional methods. In this paper, we present digital images of volcanic rocks collected with X-ray computed microtomography techniques and studied by means of a software library, called Pore3D, custom-implemented at the Elettra Synchro- tron Light Laboratory of Trieste (Italy). Using the Pore3D software, we analyzed the fabrics and we quantified the characteristics of the main constituents (vesicles, crystals, and glassy matrix) of four different types of pyroclasts: frothy pumice, tube pumice, scoria, and “crystalline” scoria. We identified the distinctive features of these different types of volcanic rocks. The frothy pumices show vesicles that coalesce in isotropic aggregates, especially toward the sample interior, while the scoriae have a low porosity and an abundance of isolated vesi- cles. In the “crystalline” scoria sample most of the vesicle separation is due to the pres- ence of crystals of different types, while the tube pumice shows an anisotropic distribu- tion of vesicles and crystals at the microscale, as also observed at the scale of the hand sample. Quantitative analysis and textural information may supply an additional tool to investigate the eruptive processes and the origin of volcanic rocks.
    Source: Geosphere. - ISSN 1553-040X (Vol. 6, no. 6, Dec. 2010, str. 793-804)
    Type of material - e-article
    Publish date - 2010
    Language - english
    COBISS.SI-ID - 136654339

    Link(s):

    https://pubs.geoscienceworld.org/gsa/geosphere/article/6/6/793/132402/Quantitative-analysis-of-X-ray-microtomography
    DOI

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