Abstract

The authors present results of first high-resolution deep seismic reflection survey in the Pieniny Klippen Belt (PKB) in Poland. This survey sheds new light on the matter of olistostromes and mélange character of PKB. The sedimentary mass-transport deposits represented by olistoliths and olistostromes manifest themselves by different petrophysical parameters of rocks (velocity, density, and resistivity) and seismic attributes. The seismic attributes are very effective in the interpretation of complex mélanges geology. The authors used selected attributes: Low-pass filter, Energy, Energy Gradient, Dip Steered Median Filter, Prewitt filter, Laplacian edge enhancing filter, Square root of the energy gradient. These attributes emphasize changes of the seismic image inside mélange zones. The distinguished olistoliths are now inside imbricated thrust structures and they are tectonically rearranged. Polygenetic mélanges in PKB originated as a result of sedimentary and tectonic processes.

The PKB in the investigated area forms several north-vergent trust-sheets belonging to Złatne and Hulina nappes. Both nappes contain large chaotic, non-reflective olistoliths as well as the smaller mainly high-reflective olistoliths. Olistoliths are arranged parallel to the flysch layering and thrusts. The presented results confirm the postulated two olistostrome belts within PKB structure.

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