Resumen de The meteoric fluids circulation during the Miocene rifting of the Penedès Halfgraben, NE Iberian Peninsula

Vinyet Baqués, Anna Travé Herrero, Antonio Benedicto, Irene Cantarero

• español

  The structural features of faults and fractures formed within the Penedès Half-graben during the Miocene have allowed identified three deformational phases. The first, during the syn-rift phase, is characterised by three successive stages of NE-SW normal faults. The second, during the early post-rift phase, consists of a minor compression phase which developed two successive stages of fractures agree with a dextral directional sense. The third, during the late post-rift phase, is characterised by two successive stages of N-S trending fractures. The fluids circulating during the Miocene rifting are meteoric in origin. The meteoric fluids related with the syn- and early post-rift stage were consistent with the fluids that cemented and altered the Miocene host-rocks, but latter, during the late post-rift, the fluids were characterised by higher involvement of soil-derived CO2 because of the vadose meteoric flow origin.

• English

  Las características de estructurales de fallas y fracturas formadas dentro del Semi-graben del Penedès durante el Mioceno han permitido identificar tres fases de deformación. La primera, durante la fase syn-rift, se caracteriza por tres etapas sucesivas de las fallas normales NE-SO. La segunda, durante el post-rift inicial, consiste en una fase de compresión menor, la cual desarrolla dos etapas sucesivas de fracturas con movimiento direccional dextro. La tercera, durante el post-rift tardío, se caracteriza por dos etapas sucesivas de fracturas de dirección N-S. Los fluidos que circularon durante el rifting Mioceno son de origen meteórico. Los fluidos meteóricos relacionados con el syn- y post-rift inicial eran compatibles con los fluidos que cementaron y alteraron las rocas de caja de edad Miocena. En cambio, los fluidos relacionados con el post-rift tardío se caracterizan por una mayor influencia del CO2 derivado del suelo debido a la circulación dentro del medio meteórico vadoso.