Evolución diagenética en el sector occidental de la Falla del Vallès-Penedès (Cadenas Costero Catalanas)

Abstract

From the study of the fracturing, fault rocks, petrology and geochemistry of carbonate cements were established the relative chronology of the different episodes of fracturing and the role of fluids during deformation in the western sector of the Vallès-Penedès Fault. Were recognized different types of fluids and hydraulic regimes during the development of the fault. Thus, during the early stages of fracturing attributed to Paleogene compression, fluids were highly interacted with the host-rock. By contrast, cements that fill the fractures related to the latest stages of deformation have low interaction with the host-rock and can be attributed to: 1) meteoric fluids circulated through the fractures during the latest stages of Paleogene compression or 2) the compressional fractures remained open and were subsequently sealed by cements precipitated from meteoric water. On the other hand, the later stages of fracturing attributed to Neogene extension, the hydrogeological system was opened to the meteoric waters and there was not interacted with the host-rock