Abstract
A Bajocian to Callovian carbonate sequence at Mareta Beach, Sagres, Portugal, contains slide deposits laid down on the southern continental slope of the Iberian Meseta. Translational slide deposits form nine discrete zones up to 6 m thick. Intercalated hard and soft beds in lobate slide masses were deformed into megascopic recumbent folds, isolated fold noses, and imbricate slabs, in a partially coherent to incoherent manner. A prominent lineation on planar and folded surfaces is due to microfold and microfault sets which formed while the beds were semi-consolidated. Bioturbated omission surfaces overlie some slide deposits suggesting that slides incorporated near-surface sediments and formed topographically high sea floor features. Early partial cementation of the hard beds may have contributed to sliding by increasing pore pressure. A rotational slide scar closely associated with the deformed zones and low-angle truncation surfaces beneath some zones suggest that rotational failure may have initiated the translational slides. A southerly paleoslope toward the Tethys Ocean is indicated by orientations of folds, bedding-plane lineations, and slide scars.
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