1,720,983 research outputs found
Anisotropy of compressional wave velocities, complex electrical resistivity and magnetic susceptibility of mylonites from the deeper crust and their relation to the rock fabric
No full textThe electrical signature of rock samples exposed to hydrostatic and triaxial pressures
No full textThe electrical signature of sedimentary (carbonate) and crystalline rock samples was studied in hydrostatic and triaxial pressure experiments up to 300 MPa. The aim was to establish a relation between an electrical signal stimulated by an external pressure acting on the sample and the mechanical stability of the rock. Natural open fractures tend to be closed under hydrostatic pressure conditions, whereas in triaxial pressure experiments new fractures are generated. These contrary processes of either decrease or increase in crack density and geometry, cause a decrease or increase in the inner surface of the sample. Such pressure induced variations in pore geometry were investigated by an interpretation and modelling of the frequency dependence of the complex electrical conductivity. In a series of hydrostatic pressure experiments crack-closure was found in the electrical signature by a decrease of the model capacitor C being related to crack geometry. This capacitor increases in the triaxial experiments where new fractures were formed.JCR Journalope
Microstructures and electrical conductivity of graphite-bearing carbonates from the Northwestern Damara Orogen, Namibia
No full textMicrostructures and electrical conductivity of graphite-bearing carbonates from the Northwestern Damara Orogen, Namibia
No full textMikrogefüge, elektrische Leitfähigkeiten und Graphitbildung in graphitführenden Marmoren des NW Damara Orogens, Namibia
No full textFabric Development and Electrical Conductivity of graphite-bearing Marbles from the Central Damara Belt, Namibia: Characteristics of a (sub)superficial MT-Anomaly
No full textMikrogefüge, elektrische Leitfähigkeiten und Graphitbildung in graphitführenden Marmoren des NW Damara Orogens, Namibia
No full textFabric Development and Electrical Conductivity of graphite-bearing Marbles from the Central Damara Belt, Namibia: Characteristics of a (sub)superficial MT-Anomaly
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