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 (η e) and total porosity (η t) measurements and 3D pore reconstruction 3) ultrasonic pulse velocity and spatial attenuation (α 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 (42.73t (6.0
Pola, A., Crosta, G., Fusi, N., Barberini, V., Norini, G., POLA VILLASENOR, A. (2012). Influence of alteration on physical properties of volcanic rocks. TECTONOPHYSICS, 566–567, 67-86 [10.1016/j.tecto.2012.07.017].
Influence of alteration on physical properties of volcanic rocks
CROSTA, GIOVANNI;FUSI, NICOLETTA CHIARA;BARBERINI, VALENTINA;NORINI, GIANLUCA;POLA VILLASENOR, ANTONIO
2012
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 (η e) and total porosity (η t) measurements and 3D pore reconstruction 3) ultrasonic pulse velocity and spatial attenuation (α 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 (42.73t (6.0
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