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Diagenetic Evolution During Progressive Development of Neogene Faults, NE Spain
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 72nd EAGE Conference and Exhibition incorporating SPE EUROPEC 2010, Jun 2010, cp-161-00313
- ISBN: 978-90-73781-86-3
Abstract
Different fractures, cements, breccias and karstic sediments identified on the Mesozoic carbonates attest to establish the diagenetic processes that have taken place during the Neogene evolution of the Penedès half-graben. Six families of fractures are identified. The first generation trending NNW-SSE is compatible with the Alpine compression whereas the fractures 2 to 6 have been attributed to the Neogene extension. The fractures 2, without preferred orientation, generated a fault breccia related to the initial propagation of the Neogene normal faults. The fluid involved during this deformation, shows a high interaction with the host-rock, in a closed hydrological system. The fractures 3, enlarged by the subaerial exposure of the Mesozoic horsts, are filled by different karstic sediments. The geochemistry of the sediments indicates the opening of the system to meteoric water. When the normal faults reached to the surface, fractures 4 to 6 are formed. The fractures fillings are a mixture of tectonic and karstic processes and resulted from multi-stages movement of the normal faults.