Abstract
The mid-Cretaceous lower Albian succession of Mañaria in North Spain contains an interval of 20 m of volcaniclastic sediments, intercalated in carbonate platform rudist limestones. The lower and upper boundaries of the volcanic interval are sharp and may represent depositional sequence boundaries. The volcaniclastic sequence is made up of epiclastic cross- and parallel-laminated volcanic sandstone and conglomerates/breccias interbedded with deeper-water marly facies. The volcanic lithoclasts are derived from a basaltic rock source. Some clasts of limestone occur mixed with the volcanics and suggest the existence of a nearby lithified carbonate platform submarine escarpment. The Mañaria epiclastic volcanics are interpreted as toe of slope submarine turbiditic systems derived from an active synsedimentary fault line (Urkiola) nearby. The activity of this fault is related to sinistral strike-slip movements of the Iberian plate with respect to the European plate during the opening of the North Atlantic (Bay of Biscay).
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