Geological, geophysical and geochemical structure of a fault zone developed in granitic rocks: Implications for fault zone modeling in 3-D

摘要: The structure of a fault zone developed in granitic rocks can be established on the basis spatial variability geological, geophysical and geochemical parameters. In North Fault Mina Ratones area (SW Iberian Massif, Spain), along two studied traverses (SR-2 SR-3 boreholes) exhibit systematic changes mineralogy, geochemistry, fabrics microstructures that are related to brittle deformation alteration granite form cataclasite subsequent gouge. distribution intensity these suggest morphology is consistent with fault-core/damage-zone model proposed by Chester et al. (1993) describe architecture. damage thickness defined development mechanically mesoscopic faults joints, produce Fracture Index (FI)>10. High FI values spatially correlated relative low seismic velocity zones (VP<5 km/s VS<2.5 well-logs), more probably high concentration fractures produced meteoric water-granite interaction surfaces. This correlation base geostatistical final part this study image architecture massif.