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Early to Middle Miocene facies succession in lacustrine and marine environments on the southwestern margin of the Pannonian basin system (Croatia)

A continuous succession of Ottnangian-Badenian sediments along the southern margin of the Pannonian Basin System indicates transition from lacustrine to marine depositional environments. The Ottnangian lake is characterized by the alternation of silts deposited from suspension and sands representing sedimentation from turbidity currents, debris flows or grain flows. These facies continues into the Karpatian, although the depositional environment becomes marine. At the transition into the Early Badenian, the environment shallows, and is represented by high energy siliciclastic shoreface and stacked Gilbert-type fan deltas. The succession is terminated with marls deposited in an offshore environment, with intercalated biocalcarenites from turbidity currents. The marine sediments are subdivided into two depositional sequences separated by a correlative conformity of a type 2 unconformity. The first sequence consists of a transgressive system tract which is represented by the Karpatian offshore sediments, and a highstand system tract, which is represented by offshore sediments deposited close to the nearshore, shoreface and stacked Gilbert-type fan deltas of the Karpatian and the Lower Badenian age, showing rapid progradation. The second sequence consists of a shelf margin system tract composed of aggrading shoreface sediments, and a transgressive system tract composed of Lower Badenian offshore sediments.

Croatia; Pannonian basin system; miocene; sequence stratigraphy; sedimentary environments

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