Pannóniai üledékképződés és szerkezeti mozgások az Északi-pikkely (Kelet-Mecsek) területén

Translated title of the contribution: Upper miocene sedimentation and tectonics in the northern imbricate zone (Eastern Mecsek Mts, SW Hungary)

Ádám Kovács, Krisztina Sebe, I. Magyar, Korecz Andrea Szurominé, Erika Kovács

Research output: Contribution to journalArticle

Abstract

The ’Northern Imbricate Zone’ along the northern edge of the Eastern Mecsek Mts, SW Hungary, are a complicated, narrow, uplifted band of basement, partly covered by Neogene sediments. The area is heavily deformed, with young, post-Miocene tectonic movements. Pannonian (Upper Miocene) lacustrine sediments are most widely distributed around the village of Nagymányok. Through their investigation it is possible to reveal the Late Miocene and subsequent evolution history. The present study concentrates on the temporary outcrops of Lake Pannon deposits created in 2015 south of Nagymányok, accompanied with fossil collection from the individual strata. This ~120 m thick sedimentary successsion is atypical compared to other parts of the Mecsek Mts, with relatively fine-grained, fossil-rich clays to fine sands above the thin (<3 m), gravelly base sands of local provenance. The fauna is dominated by bivalves; however, gastropods, ostracods and fish and plant remains have also been found. The base sands belong to the Prosodacnomya dainellii-P. vutskitsi mollusc biozones, the finer sediments to the Congeria rhomboidea biozone. Through the joint interpretation of the litho-and biofacies the sedimentary environments and the age of deposition of the sediments were identified, while the evolution of the wider surroundings was delineated by adding the tectonic observations, borehole data and seismic sections to the previous information. Lacustrine sedimentation first started only in the northern foreland of the mountains, accummulating offshore marls, claymarls and silts (Szák Claymarl Fm). The time of flooding is unknown in the trough directly at the foot of the mountains due to the lack of wells and palae-ontological data; the wide platform north of it became flooded no sooner than 8.9 Ma based on mollusc data. This was followed by the fine sands to clays of the Alpine-Carpathian delta system (Újfalu Fm), approx. 7.3 Ma ago, as indicated by molluscs belonging to the Prosodacnomya dainellii and P. vutskitsi littoral biozones. As no clinoforms are present on seismic profiles, the northern foreland must have been a shallow underwater high at that time. The Northern Imbricate Zone in the mountains were dryland during most of the Late Miocene. Sedimentation started here approximately coevally with the arrival of the delta system at the foot of the mountains. Flooding ensued on a dissected topography. The delta sediments with dominantly sublittoral fauna above the thin littoral base sands indicate rapid transgression. Late Miocene sedimentation was accompanied by small-scale movements of strike-slip character. More important tectonic deformations followed afterwards: strike-slip to north-vergent reverse displacements happened along the northern master fault of the Mecsek and roughly parallel planes.

Original languageHungarian
Pages (from-to)327-340
Number of pages14
JournalFoldtani Kozlony
Volume148
Issue number4
DOIs
Publication statusPublished - Jan 1 2018

Fingerprint

Tectonics
Sedimentation
Molluscs
Sediments
Sand
Miocene
sedimentation
tectonics
sand
mollusc
mountain
sediment
lacustrine deposit
flooding
fossil
fauna
clay
biofacies
Boreholes
ostracod

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology
  • Stratigraphy
  • Palaeontology

Cite this

Pannóniai üledékképződés és szerkezeti mozgások az Északi-pikkely (Kelet-Mecsek) területén. / Kovács, Ádám; Sebe, Krisztina; Magyar, I.; Szurominé, Korecz Andrea; Kovács, Erika.

In: Foldtani Kozlony, Vol. 148, No. 4, 01.01.2018, p. 327-340.

Research output: Contribution to journalArticle

Kovács, Ádám ; Sebe, Krisztina ; Magyar, I. ; Szurominé, Korecz Andrea ; Kovács, Erika. / Pannóniai üledékképződés és szerkezeti mozgások az Északi-pikkely (Kelet-Mecsek) területén. In: Foldtani Kozlony. 2018 ; Vol. 148, No. 4. pp. 327-340.
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abstract = "The ’Northern Imbricate Zone’ along the northern edge of the Eastern Mecsek Mts, SW Hungary, are a complicated, narrow, uplifted band of basement, partly covered by Neogene sediments. The area is heavily deformed, with young, post-Miocene tectonic movements. Pannonian (Upper Miocene) lacustrine sediments are most widely distributed around the village of Nagym{\'a}nyok. Through their investigation it is possible to reveal the Late Miocene and subsequent evolution history. The present study concentrates on the temporary outcrops of Lake Pannon deposits created in 2015 south of Nagym{\'a}nyok, accompanied with fossil collection from the individual strata. This ~120 m thick sedimentary successsion is atypical compared to other parts of the Mecsek Mts, with relatively fine-grained, fossil-rich clays to fine sands above the thin (<3 m), gravelly base sands of local provenance. The fauna is dominated by bivalves; however, gastropods, ostracods and fish and plant remains have also been found. The base sands belong to the Prosodacnomya dainellii-P. vutskitsi mollusc biozones, the finer sediments to the Congeria rhomboidea biozone. Through the joint interpretation of the litho-and biofacies the sedimentary environments and the age of deposition of the sediments were identified, while the evolution of the wider surroundings was delineated by adding the tectonic observations, borehole data and seismic sections to the previous information. Lacustrine sedimentation first started only in the northern foreland of the mountains, accummulating offshore marls, claymarls and silts (Sz{\'a}k Claymarl Fm). The time of flooding is unknown in the trough directly at the foot of the mountains due to the lack of wells and palae-ontological data; the wide platform north of it became flooded no sooner than 8.9 Ma based on mollusc data. This was followed by the fine sands to clays of the Alpine-Carpathian delta system ({\'U}jfalu Fm), approx. 7.3 Ma ago, as indicated by molluscs belonging to the Prosodacnomya dainellii and P. vutskitsi littoral biozones. As no clinoforms are present on seismic profiles, the northern foreland must have been a shallow underwater high at that time. The Northern Imbricate Zone in the mountains were dryland during most of the Late Miocene. Sedimentation started here approximately coevally with the arrival of the delta system at the foot of the mountains. Flooding ensued on a dissected topography. The delta sediments with dominantly sublittoral fauna above the thin littoral base sands indicate rapid transgression. Late Miocene sedimentation was accompanied by small-scale movements of strike-slip character. More important tectonic deformations followed afterwards: strike-slip to north-vergent reverse displacements happened along the northern master fault of the Mecsek and roughly parallel planes.",
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T1 - Pannóniai üledékképződés és szerkezeti mozgások az Északi-pikkely (Kelet-Mecsek) területén

AU - Kovács, Ádám

AU - Sebe, Krisztina

AU - Magyar, I.

AU - Szurominé, Korecz Andrea

AU - Kovács, Erika

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N2 - The ’Northern Imbricate Zone’ along the northern edge of the Eastern Mecsek Mts, SW Hungary, are a complicated, narrow, uplifted band of basement, partly covered by Neogene sediments. The area is heavily deformed, with young, post-Miocene tectonic movements. Pannonian (Upper Miocene) lacustrine sediments are most widely distributed around the village of Nagymányok. Through their investigation it is possible to reveal the Late Miocene and subsequent evolution history. The present study concentrates on the temporary outcrops of Lake Pannon deposits created in 2015 south of Nagymányok, accompanied with fossil collection from the individual strata. This ~120 m thick sedimentary successsion is atypical compared to other parts of the Mecsek Mts, with relatively fine-grained, fossil-rich clays to fine sands above the thin (<3 m), gravelly base sands of local provenance. The fauna is dominated by bivalves; however, gastropods, ostracods and fish and plant remains have also been found. The base sands belong to the Prosodacnomya dainellii-P. vutskitsi mollusc biozones, the finer sediments to the Congeria rhomboidea biozone. Through the joint interpretation of the litho-and biofacies the sedimentary environments and the age of deposition of the sediments were identified, while the evolution of the wider surroundings was delineated by adding the tectonic observations, borehole data and seismic sections to the previous information. Lacustrine sedimentation first started only in the northern foreland of the mountains, accummulating offshore marls, claymarls and silts (Szák Claymarl Fm). The time of flooding is unknown in the trough directly at the foot of the mountains due to the lack of wells and palae-ontological data; the wide platform north of it became flooded no sooner than 8.9 Ma based on mollusc data. This was followed by the fine sands to clays of the Alpine-Carpathian delta system (Újfalu Fm), approx. 7.3 Ma ago, as indicated by molluscs belonging to the Prosodacnomya dainellii and P. vutskitsi littoral biozones. As no clinoforms are present on seismic profiles, the northern foreland must have been a shallow underwater high at that time. The Northern Imbricate Zone in the mountains were dryland during most of the Late Miocene. Sedimentation started here approximately coevally with the arrival of the delta system at the foot of the mountains. Flooding ensued on a dissected topography. The delta sediments with dominantly sublittoral fauna above the thin littoral base sands indicate rapid transgression. Late Miocene sedimentation was accompanied by small-scale movements of strike-slip character. More important tectonic deformations followed afterwards: strike-slip to north-vergent reverse displacements happened along the northern master fault of the Mecsek and roughly parallel planes.

AB - The ’Northern Imbricate Zone’ along the northern edge of the Eastern Mecsek Mts, SW Hungary, are a complicated, narrow, uplifted band of basement, partly covered by Neogene sediments. The area is heavily deformed, with young, post-Miocene tectonic movements. Pannonian (Upper Miocene) lacustrine sediments are most widely distributed around the village of Nagymányok. Through their investigation it is possible to reveal the Late Miocene and subsequent evolution history. The present study concentrates on the temporary outcrops of Lake Pannon deposits created in 2015 south of Nagymányok, accompanied with fossil collection from the individual strata. This ~120 m thick sedimentary successsion is atypical compared to other parts of the Mecsek Mts, with relatively fine-grained, fossil-rich clays to fine sands above the thin (<3 m), gravelly base sands of local provenance. The fauna is dominated by bivalves; however, gastropods, ostracods and fish and plant remains have also been found. The base sands belong to the Prosodacnomya dainellii-P. vutskitsi mollusc biozones, the finer sediments to the Congeria rhomboidea biozone. Through the joint interpretation of the litho-and biofacies the sedimentary environments and the age of deposition of the sediments were identified, while the evolution of the wider surroundings was delineated by adding the tectonic observations, borehole data and seismic sections to the previous information. Lacustrine sedimentation first started only in the northern foreland of the mountains, accummulating offshore marls, claymarls and silts (Szák Claymarl Fm). The time of flooding is unknown in the trough directly at the foot of the mountains due to the lack of wells and palae-ontological data; the wide platform north of it became flooded no sooner than 8.9 Ma based on mollusc data. This was followed by the fine sands to clays of the Alpine-Carpathian delta system (Újfalu Fm), approx. 7.3 Ma ago, as indicated by molluscs belonging to the Prosodacnomya dainellii and P. vutskitsi littoral biozones. As no clinoforms are present on seismic profiles, the northern foreland must have been a shallow underwater high at that time. The Northern Imbricate Zone in the mountains were dryland during most of the Late Miocene. Sedimentation started here approximately coevally with the arrival of the delta system at the foot of the mountains. Flooding ensued on a dissected topography. The delta sediments with dominantly sublittoral fauna above the thin littoral base sands indicate rapid transgression. Late Miocene sedimentation was accompanied by small-scale movements of strike-slip character. More important tectonic deformations followed afterwards: strike-slip to north-vergent reverse displacements happened along the northern master fault of the Mecsek and roughly parallel planes.

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