Laboratory SIP signatures associated with oxidation of disseminated metal sulfides

Geophysical Properties of the Near Surface Earth: Electrical Properties

“…is the magnitude of the electric field applied to the material (in V m À1 ) and J ! It is worth noting that the range of measured resistivities is extremely large from 10 À7 Om for copper to 10 18 Om for diamond (Pierson, 2004). Resistivity depends on temperature.…”

On the pore water chemistry effect on spectral induced polarization measurements in the presence of pyrite

“…The leaky-capacitive effect (or "imperfect" surface polarization) and the mineralogical transformations on the external lattice of the metallic mineral surface (e.g., the formation of Fe-oxy-hydroxy-sulphate phases) as part of the oxidative-weathering process, have been found to diminish the magnitude and broaden the peak of the laboratory-measured SIP response for pyrrhotite-sand mixtures (Placencia-Gómez et al, 2013;Placencia-Gómez and Slater, 2014) and mine waste materials (tailings) containing pyrite and pyrrhotite (Campbell and Horton, 2001;Placencia-Gómez et al, 2015). This is likely accompanied by a shift of the polarization peak towards lower frequencies as suggested by the model of Wong (Fig.…”

“…We used four mixtures of silica-sand and pyrite (py-sand) prepared as identically as possible and packed in cylindrical columns following procedures described in Placencia-Gómez et al (2013). The representative grain size of the materials was based on the diameter of the sieve openings, ranging between 0.5 mm and 1 mm for the silica sand and between 0.125 and 1 mm for the pyrite particles, respectively.…”

“…These include investigations on biogeochemical transformations (FloresOrozco et al, 2011;Ntarlagiannis et al, 2005;Personna et al, 2008;Slater et al, 2007;Williams et al, 2005Williams et al, , 2009, oxidation-reduction (redox) reactions (Hubbard et al, 2014;Placencia-Gómez et al, 2013), mine tailings and acid mine drainage characterization (Campbell and Horton, 2001;Placencia-Gómez et al, 2015;Vanhala et al, 2005;Yuval and Oldenburg, 1996), monitoring of reactive iron barrier performance (Slater et al, , 2006Wu et al, 2005); and characterization of the polarization properties of different metal minerals (Abdel Aal et al, 2014;Gurin et al, 2013Gurin et al, , 2015Zhdanov et al, 2012) and nanoparticles (Joyce et al, 2012;Flores-Orozco et al, 2015). Such studies mainly focus on the role of the metal content (total weight or volume fraction percentage) and physical (textural) properties such as the metallic particle grain size and surface area on the spectral induced polarization (SIP) response.…”

Induced polarization applied to biogeophysics: recent advances and future prospects

“…(2004) and Placencia‐Gómez et al . () studied processes relevant to mineral surface dynamics, including mineral transformation, surface absorption/desorption, as well as mineral transformation during redox reactions. While such studies have collectively demonstrated the sensitivity of SIP signals to the by‐products of biogeochemical processes, the way SIP signals can be better related to reactive processes in the mineral‐water system is still poorly explored.…”