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Titel |
Tectonic and sequence stratigraphic evolution of asymmetric extensional back-arc basins: seismic interpretations in the Pannonian Basin |
VerfasserIn |
Attila Balázs, Liviu Matenco, Imre Magyar, Ferenc Horváth, Sierd Cloetingh ![Link zu Wikipedia](images_gba/icon_wikipedia.jpg) |
Konferenz |
EGU General Assembly 2015
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 17 (2015) |
Datensatznummer |
250107042
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Publikation (Nr.) |
EGU/EGU2015-6730.pdf |
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Zusammenfassung |
The evolution of the Pannonian Basin is generally thought to be driven by subduction roll-back associated with mantle flow dynamics. The Miocene back-arc extension resulted in the formation of dominantly half-grabens in the hanging wall of low-angle detachments and listric normal faults, associated with coeval large-scale exhumation of their footwalls. To quantify the evolution of these asymmetric extensional structures, a novel kinematic and seismic sequence stratigraphic interpretation was performed. Based on reflection terminations and characteristic seismic facies we separated systems tracts of the half-graben deposits that formed as a result of interplay between subsidence, sedimentation and water-level variations. Lower order systems tracts were defined by separating rift initiation, rift climax, immediate post-rift and late post-rift systems tracts, while a higher order transgressive-regressive cyclicity and associated unconformities were locally identified in the syn-tectonic basin fill.
Connecting these observations demonstrates that extension migrated in time and space across the basin. Extension started during Early Miocene in the oldest sub-basins, while Middle Miocene rift climax is quite common in the entire study area. The youngest syn-tectonic strata were deposited during Late Miocene times in the eastern parts of the Pannonian Basin, for instance, in the Derecske, Makó and Szeged Troughs. The syn-rift/post-rift boundary cannot be interpreted as a discrete event in the entire basin system, because it is a progressive, process-related expression. The obtained results significantly improve the classic ideas of syn-rift/post-rift evolution of the Pannonian Basin. |
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