Miocene syn-rift lacustrine sediments in the Mecsek Mts. (SW Hungary)

Krisztina Sebe, Ildikó Selmeczi, Andrea Szuromi-Korecz, L. Hably, Ádám Kovács, Zsolt Benkó

Research output: Article

Abstract

The Pannonian Basin, a major back-arc basin in the Alpine–Carpathian orogenic belt, experienced its syn-rift phase during the Early–Middle Miocene. Studying coeval sediments can provide important information on the initiation of the extension. This paper investigates syn-rift deposits in the Mecsek Mts. in SW Hungary from a tectono-sedimentary aspect, using stratigraphy, palaeontology and structural observations to constrain palaeoenvironments and their tectonic background. Our study shows that in the Mecsek area the widespread Early Miocene fluvial sedimentation was not directly followed by inundation by the Central Paratethys sea, instead, a phase of lacustrine deposition in the Karpatian–Early Badenian (late Burdigalian–early Langhian) preceded the marine flooding. The lake sediments have a low-diversity but abundant, endemic mollusc and ostracod fauna, dominated by the bivalve Congeria boeckhi and the gastropod Ferebithynia vadászi. Identical faunas at various sites indicate that “Lake Mecsek” was a single water body, covering the present-day Mecsek Mts. and their surroundings. Wedge-shaped clastic bodies along faults, fault scarp breccias and semi-soft sediment deformations suggest that extensional tectonic activity related to the rifting of the Pannonian Basin played a role in lake basin formation. The accumulation of lakes was probably also enhanced by increased precipitation during the Miocene Climatic Optimum. The Central Paratethys flooded the area in the Badenian (Langhian) and deposited normal marine sediments over the lacustrine ones. Considering the fauna, the sedimentary succession, the structural background and evolution history, the Mecsek area seems to be part of the Illyrian bioprovince and related to the Dinaride Lake System.

Original languageEnglish
JournalSwiss Journal of Geosciences
DOIs
Publication statusAccepted/In press - jan. 1 2019

Fingerprint

lacustrine deposit
Paratethys
Badenian
Miocene
fauna
lake
basin
fault scarp
Hypsithermal
paleontology
extensional tectonics
paleoenvironment
basin evolution
orogenic belt
ostracod
mollusc
gastropod
sediment
marine sediment
rifting

ASJC Scopus subject areas

  • Geology

Cite this

Miocene syn-rift lacustrine sediments in the Mecsek Mts. (SW Hungary). / Sebe, Krisztina; Selmeczi, Ildikó; Szuromi-Korecz, Andrea; Hably, L.; Kovács, Ádám; Benkó, Zsolt.

In: Swiss Journal of Geosciences, 01.01.2019.

Research output: Article

Sebe, Krisztina ; Selmeczi, Ildikó ; Szuromi-Korecz, Andrea ; Hably, L. ; Kovács, Ádám ; Benkó, Zsolt. / Miocene syn-rift lacustrine sediments in the Mecsek Mts. (SW Hungary). In: Swiss Journal of Geosciences. 2019.
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abstract = "The Pannonian Basin, a major back-arc basin in the Alpine–Carpathian orogenic belt, experienced its syn-rift phase during the Early–Middle Miocene. Studying coeval sediments can provide important information on the initiation of the extension. This paper investigates syn-rift deposits in the Mecsek Mts. in SW Hungary from a tectono-sedimentary aspect, using stratigraphy, palaeontology and structural observations to constrain palaeoenvironments and their tectonic background. Our study shows that in the Mecsek area the widespread Early Miocene fluvial sedimentation was not directly followed by inundation by the Central Paratethys sea, instead, a phase of lacustrine deposition in the Karpatian–Early Badenian (late Burdigalian–early Langhian) preceded the marine flooding. The lake sediments have a low-diversity but abundant, endemic mollusc and ostracod fauna, dominated by the bivalve Congeria boeckhi and the gastropod Ferebithynia vad{\'a}szi. Identical faunas at various sites indicate that “Lake Mecsek” was a single water body, covering the present-day Mecsek Mts. and their surroundings. Wedge-shaped clastic bodies along faults, fault scarp breccias and semi-soft sediment deformations suggest that extensional tectonic activity related to the rifting of the Pannonian Basin played a role in lake basin formation. The accumulation of lakes was probably also enhanced by increased precipitation during the Miocene Climatic Optimum. The Central Paratethys flooded the area in the Badenian (Langhian) and deposited normal marine sediments over the lacustrine ones. Considering the fauna, the sedimentary succession, the structural background and evolution history, the Mecsek area seems to be part of the Illyrian bioprovince and related to the Dinaride Lake System.",
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AU - Selmeczi, Ildikó

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AU - Hably, L.

AU - Kovács, Ádám

AU - Benkó, Zsolt

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AB - The Pannonian Basin, a major back-arc basin in the Alpine–Carpathian orogenic belt, experienced its syn-rift phase during the Early–Middle Miocene. Studying coeval sediments can provide important information on the initiation of the extension. This paper investigates syn-rift deposits in the Mecsek Mts. in SW Hungary from a tectono-sedimentary aspect, using stratigraphy, palaeontology and structural observations to constrain palaeoenvironments and their tectonic background. Our study shows that in the Mecsek area the widespread Early Miocene fluvial sedimentation was not directly followed by inundation by the Central Paratethys sea, instead, a phase of lacustrine deposition in the Karpatian–Early Badenian (late Burdigalian–early Langhian) preceded the marine flooding. The lake sediments have a low-diversity but abundant, endemic mollusc and ostracod fauna, dominated by the bivalve Congeria boeckhi and the gastropod Ferebithynia vadászi. Identical faunas at various sites indicate that “Lake Mecsek” was a single water body, covering the present-day Mecsek Mts. and their surroundings. Wedge-shaped clastic bodies along faults, fault scarp breccias and semi-soft sediment deformations suggest that extensional tectonic activity related to the rifting of the Pannonian Basin played a role in lake basin formation. The accumulation of lakes was probably also enhanced by increased precipitation during the Miocene Climatic Optimum. The Central Paratethys flooded the area in the Badenian (Langhian) and deposited normal marine sediments over the lacustrine ones. Considering the fauna, the sedimentary succession, the structural background and evolution history, the Mecsek area seems to be part of the Illyrian bioprovince and related to the Dinaride Lake System.

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