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Rift tectonostratigraphic sequences: a tool for correlation of syn-rift strata in sedimentary basins

Tectonostratigraphic approaches to sequence stratigraphy provide an exploration tool for predictable characterization of the spatial and temporal distribution of depositional systems in rift basins. Pulsating extension can result in more tectonostratigraphic packages bounded with unconformities [1]. These units can be a result of tectonic activity of a different order, from single fault or subsidence episode, when reduced to the simplest [2], to the regional scale of the entire infill of one tectonic regime [3]. In order to utilize units for practical use in different basins and data resolution conditions, Rift tectonostratigraphic sequences (RS) are suggested. RS are defined as tectonostratigraphic units resulting from the pulsating extension, i.e., tectonic cycles of a different order (magnitude) controlled by the fault movements. This type of units represent genetically related sediments bounded by unconformities and/or their correlative conformities predominantly controlled by tectonic subsidence. Their boundaries determine the rank of each unit in the sense previously defined by Embry [4], whereas the difference is that the boundaries are primarily set by tectonic activity. More precisely, the 1st order (i) boundaries are widespread unconformities coinciding with a significant shift in tectonic setting (e.g., syn-rift to post-rift), while the highest order boundaries i+1th are set by the individual movements along fault or the smallest subsidence episode. Each RS consists of two systems tracts - Fault active system tract contains sediments influenced by intense fault activity, while Fault stagnation system tract encompasses sedimentary succession characteristic of fault quiescence. Thus defined units can illustrate basin evolution and can be used at different temporal and spatial scales, especially if abundant seismic data is available, overcoming the lack of well data for spatial correlation. RS are tested in SW part of the Pannonian Basin System, continental rift type basin characterised by episodic tectonic movements, migration of depocenters, and complex lithology.

tectonostratigraphy, sequence stratigraphy, seismic data, syn-rift.

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