Naslov
Late Miocene variation of accommodation in the Drava Trough: stratigraphic forward modeling and field observations

Autori
Kovács, Ádám ; Balázs, Attila ; Špelić, Marko ; Magyar, Imre ; Sztanó, Orsolya

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Petroleum Systems Between Central Europe and the Caspian Region / Tari, Gabor ; Sachsenhofer, Reinhard - Beč : AAPG, 2019, 149-149

Skup
AAPG Europe Regional Conference: Paratethys Petroleum Systems between Central Europe and the Caspian Region

Mjesto i datum
Beč, Austrija, 26.03.2019. - 27.03.2019

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
DionisosFlow, intra-Messinian unconformity, Lake Pannon, basin inversion

Sažetak
This study focuses on the so-called Pa(n)-4 sequence boundary or intra-Messinian unconformity and its appearance in the Drava Trough. A surface with similar geometric relations, i.e. folded/tilted lacustrine beds overlain by onlaps, can be observed in many places over the Pannonian Basin (PB). The regional nature of this surface led to the conclusion that it can be correlated basin-wide and it is a result of a major lake-level drop related to the Messinian Salinity Crisis (MSC) even though the Lake Pannon had no direct connection to the Mediterranian Sea. In contrast others argue, studying this feature in the eastern part of the PB, that a local interplay of structural events and the superposition of two different sediment feeder systems may have caused the observed geometry. There is still no consensus about the nature or the age of this surface. Prior to the events leading to the formation of this unconformity a significant flooding event took place. Stratal stacking is remarkably different in the Drava Trough compared to the one of the Eastern PB, though large thickness of shallow-water deposits is a common feature. The main goal of this study is to analyze factors controlling stratal geometries and to understand what change of the depositional environments occurred in relation with the above described events. The DionisosFlow stratigraphic modeling software was used constrained by seismic stratigraphy to reveal interactions of controlling factors. The extent of the Pa(n)-4 was traced in 2D seismic sections from the Mecsek Mts. (SW Hungary) to the Papuk Mts. (N Croatia). The model takes into account numerous factors such as sediment supply, tectonic uplift or subsidence rate. With the backstripping method three different scenarios were modeled: a) structural, b) climatic and c) sediment-supply controlled versions. By modifying input parameters, different effects became dominant and the variations in stratal geometries were analyzed. In addition, field observations from the margin of the Papuk Mts. helped to identify similar events in outcrops. A Late Miocene angular unconformity could be studied within the lacustrine succession, between profundal calcareous marls and shallow- water deltaic sands and clays. The hypothesis was tested favoring basin inversion and other factors rather than a major lake-level fall causing the prominent unconformity, with the onlap geometry. Results of the modeling are relevant to the expression of the MSC in the Pannonian Basin. This presentation was supported by MOL Academic Aid Program and NKFIH 116618.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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