Triassic Sequence Stratigraphy in the Western Part of the Northern Calcareous Alps (Austria)
Published:January 01, 1999
Thomas Rüffer, Thilo Bechstädt, 1999. "Triassic Sequence Stratigraphy in the Western Part of the Northern Calcareous Alps (Austria)", Mesozoic and Cenozoic Sequence Stratigraphy of European Basins, Pierre-Charles de Graciansky, Jan Hardenbol, Thierry Jacquin, Peter R. Vail
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During Triassic times, the Northern Calcareous Alps were situated at the northwestern margin of the Tethys ocean. Succeeding the Permian and Lower Triassic red bed stage, shallow-water carbonates were the main constituents of the Middle and Late Triassic strata, in addition to some mixed carbonate-clastic deposits and basin carbonates. Biostratigraphic data enables exact positioning of the depositional sequences. Despite many good correlations with other Alpine regions as well as with epicontinental Triassic units of central, northwestern and northern Europe, no correlative sequences exist in the Northern Calcareous Alps during late Anisian, late Ladinian, early Carnian and probably Norian times. Variations resulted from local (basin-wide) controls, mainly caused by diverging subsidence patterns. While second-order trends roughly correspond with other Triassic basins, peak transgressions and maximum regressions show some differences.
Separated by postdepositional Alpine strike-slip and thrust tectonics from the stable European northern hinterland, definition of third-order sequence boundaries is often problematic in the Northern Calcareous Alps. Without unconformities, sequence stratigraphy sensu Vail and coworkers cannot be applied in a strict sense. Transgressive and maximum flooding surfaces comprised the best marker horizons for correlationing sequences. A working procedure that incorporates at least parts of the genetic stratigraphic sequence model of Galloway (1989) proved extremely helpful in working with these successions.
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Mesozoic and Cenozoic Sequence Stratigraphy of European Basins
Mesozoic and Cenozoic Sequence Stratrigraphy of European Basins - This project was designed to build a documented chronostratigraphic and outcrop record of depositional sequences calibrated across European Basins. Data on standard stages, magnetostratigraphy, and geochronology integrated with high resolution biostratigraphy calibrate the stratigraphic position of depositional sequence boundaries. Higher order eustatic sequences show a significant increase in the number identified. A good portion of the European Mesozoic and Cenozoic succession is set in a sequence stratigraphic context with a better stratigraphic record of its bonding surfaces.