Influence of alteration on physical properties of volcanic rocks (Articolo in rivista)

Type
Label
  • Influence of alteration on physical properties of volcanic rocks (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.tecto.2012.07.017 (literal)
Alternative label
  • Antonio Pola, Giovanni Crosta, Nicoletta Fusi, Valentina Barberini, Gianluca Norini (2012)
    Influence of alteration on physical properties of volcanic rocks
    in Tectonophysics (Amst. Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Antonio Pola, Giovanni Crosta, Nicoletta Fusi, Valentina Barberini, Gianluca Norini (literal)
Pagina inizio
  • 67 (literal)
Pagina fine
  • 86 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.sciencedirect.com/science/article/pii/S0040195112004350 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 566-567 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 20 (literal)
Note
  • ISI Web of Science (WOS) (literal)
  • Google Scholar (literal)
  • Scopus (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • - Instituto de Geofísica, Universidad Nacional Autónoma de México, Campus Morelia-UNAM, Antigua carretera a Pátzcuaro 8701, 58190 Morelia, Michoacán, Mexico - Dip. di Scienze Geologiche e Geotecnologie, Università degli Studi di Milano-Bicocca, Piazza della Scienza 4, 20126 Milano, Italy - Consiglio Nazionale delle Ricerche (IDPA), via Mario Bianco 9, 20133 Milano, Italy (literal)
Titolo
  • Influence of alteration on physical properties of volcanic rocks (literal)
Abstract
  • Physical properties of some weathered/altered volcanic rocks and their variation with the degree of alteration are described in detail. A series of tests was performed to identify and quantify the progressive degradation of the properties: 1) petrographycal and chemical studies; 2) effective (?e) and total porosity (?t) measurements and 3D pore reconstruction 3) ultrasonic pulse velocity and spatial attenuation (?s) measurements. Four different volcanic lithologies have been tested: i) trachytic lava with abundant crystals; ii) pyroclastic deposits, with lava clasts and pumice elements; iii) green tuff, made prevalently of pumice clasts; and iv) non-welded ignimbrite deposits. Chemical indices of weathering (CIW) reveal large differences (42.73 < Chemical Index of Alteration [CIA] < 69.24) not only between lithotypes, but also between samples. These differences are reflected by physical properties, in particular ?t (6.0 < ?t from X-ray tomography images < 49.8%), ?e (11.0 < ?e from mercury porosimeter < 65.0%) and shear wave velocity values (0.50 < Vs < 2.90 km/s). Pore network evolution with alteration for each lithology is well documented by fractal dimension (D) and ?s. Mean values of porosity are strictly related to P and S wave velocity (Vp and Vs) and the degree of alteration. Values of CIA are well correlated with the degradation trend exhibited by measured physical properties. The combination of techniques to measure the ?t and ?e provides a good estimate of grain size and pore size distribution and rock structure. Defects and particular characteristics in the rock sample (e.g. micro-fractures, voids, cavities and orientation and sizes of certain minerals and clasts) are revealed by ?s values: the smaller the ?s the more homogeneous and less altered is the sample. (literal)
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