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Halokinetic and Compressional Tectonics Interplay in the South and Central Adriatic, Offshore Croatia

The southern part of the Adriatic offshore in Croatia was only partially covered with vintage 2D seismic data, mostly near to the coast line and in the vicinity of larger islands. Recently, however, two independent seismic acquisitions have been conducted by INA (2012) and Spectrum (2013) that beside significantly better imaging of structures, resulted in coverage of previously unexplored parts of the South Adriatic basin, thus providing a new insight into structural styles and tectonics in this part of the Mediterranean. First studies show that compressional structures, which predominate in coastline and hinterland area of the fold-thrust belt of the Dinarides gradually turn towards the west into prevailing halokinetic structures controlled by deformation of Triassic salt. In the southern part of the study area the most prominent halokinetic structures are aligned along the NW-SE trending South Adriatic Ridge (SAR) formed ahead of the SW-verging fold-thrust belt of the Dinarides. The SAR comprises a set of salt anticlines and intervening synclines that gradually increase in height towards the NW and merge into the belt of salt diapirs concentrated around the Palagruža High. Onset of anticlines growth in the SAR took place, at least locally, already during Jurassic, and continued to growth during Cretaceous, Oligo-Miocene and locally even in Pliocene times. In the Central Adriatic, compressional tectonics with prevailing southwest-verging thrusting provoked intensive salt flowage that locally resulted in diapirism, salt extrusion, piercing and collapse structures. Almost as a rule, halokinetic structures are associated with fractures and normal faults well developed in younger Mesozoic carbonate and Cenozoic clastic sequences and are used as pathways for gas and fluid migration, clearly documented by numerous gas chimneys and bright spots developed above and around these halokinetic structures.

Halokinetic and compressional tectonics, Adriatic basin, Croatia

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