Características estructurales y estratigráficas del substrato Plioceno del Delta del Llobregat (Barcelona, España): aplicación a los estudios hidrogeológicos

• Autores: Francisco J. Alcalá, J. Miró, P. Rodríguez, Manuel Martín Martín
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 5, 2003 (Ejemplar dedicado a: V Congreso del Grupo Español del Terciario (Granada, 23-25 de septiembre, 2003)), págs. 23-26
• Idioma: inglés
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• Resumen

  • The study of 71 mechanical bore-hole has allowed to characterize the pre-Quaternary substratum of the Llobregat delta, mainly composed by marine Pliocene clays. The Pliocene is divided in two depositional sequences. The first one is transgressive with a onlap device on the previous materials; the second are regressive with a offlap device on the previous one. The Plio-Quaternary limit (2,0±0,1 Ma) constitute to discontinuity surface associated to the fini-pliocene marine regression. Three marine stabilization sea levels have been detected to ~ 80, 100-110 and ~ 150 m.b.s.l. The two regional faults systems identified (SW-NE and NNW-SSE) have their continuation in the Quaternary materials as growth faults. These systems produce the extensional compartimentation of the former basin, giving a relief of rising and deeping blocks that conditions the unequal volume of accommodation and rate of subsidence during the Quaternary. The consequence is a bigger thickness of sediments affected by marine intrusion in coastal areas and the desconection of Quaternary aquifer levels.