Actividad tectónica durante la época medieval y romana en la cuenca de Granada (La falla de la Malaha)

Resumen

The Malahá Fault produces an intrabasinal high in the Granada basin. This active normal fault, over 15 km long, with a WNW-ENE trend exhumes the metamorphic basement in the middle part of the basin. The sedimentary sequence related with the fault activity is formed byHolocene deposits with human vestiges like bones, ash levels and roman and medieval ceramic fragments. In order to estimate the sedimentation rates, we have dated several depositional units of the hanging-wall by AMS-C14. The AMS-C14 ages, between 3010±25 BP (base of the sedimentary sequence) and 887±48 BP, are consistent with the ceramic fragments found in different levels. The fault produces the tilting of deposits with an age of 2422±25 BP. Consequently, we conclude the fault has been active during the last three millenniums, producing sedimentation rates in its hanging-wall ranging between 0.4 and 1.7 mm/yr. The lack of pre-Quaternary sediments related with this fault suggests that it formed recently in relation with bainward propagation of extension in the Granada Basin.