Geodynamic implications derived from Numidian-like distal turbidites deposited along the Internal–External Domain Boundary of the Betic Cordillera (S Spain)


Francisco J. Alcalá, Geo-Systems Centre (CVRM-IST), Technical University of Lisbon, Av. Rovisco Pais, 1, 1049-001 Lisbon, Portugal. Tel.: +351 218 417 408; fax: +351 218 417 442;


Terra Nova, 00, 1–12, 2012


New data reveal Early Burdigalian ‘Numidian-like lithofacies’ in successions of the internal (southernmost) part of the South Iberian Margin (SIM) and the south-western margin of the Mesomediterranean Microplate (MM). The well-known Numidian Formation was deposited in the external (Massylian) sub-domain of the Maghrebian Flysch Basin (a south-western branch of the Tethys Ocean). The anomalous occurrence of ‘Numidian-like lithofacies’ is induced by the particular Early Miocene palaeogeographical and geodynamic complexity of the sector. This consisted of a ‘triple point’ with a dextral transform fault between the SIM and the MM-Maghrebian Flysch Basin system. In this framework, the ageing of Iberian reliefs and the MM collapse, coupled with an African Margin upbulging, and a shortening of the Maghrebian Flysch Basin (both related to the subduction), could have resulted in the arrival of the Numidian depositional system from so far away.