Stratigraphic and sedimentological analysis of the Upper Cretaceous sequence of the Zala Basin on the basis of the investigation of the Szilvágy-33 well

Ágnes Siegl-Farkas, J. Haas

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3 Citations (Scopus)

Abstract

The Senonian succession of the Szilvágy-33 well in the Northern Zala Basin was investigated in order to re-evaluate its chronostratigraphic subdivision and depositional history. The studied sequence begins with the Ajka Formation of reduced thickness and atypical facies. This is followed by the Jákó Formation with the interfingering layers of the Ugod Limestone, and then the approximately 300 m-thick section of the Ugod Limestone which is covered by the Polány Marl. According to the palynologic and nannoplankton investigations, the entire encountered sequence can be assigned to the Campanian. The layers assignable to the Ajka Formation contain the sporomorph assemblage known from the upper section of the Jákó Formation in the Bakony basins, clearly indicating a considerable temporal shift of the lithofacies during transgression. The late transgression demonstrated in the Szilvágy-33 well suggests an elevated paleotopography. In contrast to the former assumptions, the transgression may not have reached the Bakony region via the Zala Basin; rather, both sub-areas were invaded by the sea from the South Alpine pelagic basins.

Original languageEnglish
Pages (from-to)153-174
Number of pages22
JournalActa Geologica Hungarica
Volume45
Issue number2
DOIs
Publication statusPublished - 2002

Fingerprint

transgression
Cretaceous
basin
limestone
paleotopography
Senonian
nanoplankton
marl
Campanian
lithofacies
analysis
history
sea

Keywords

  • Biostratigraphy
  • Campanian
  • Lithostratigraphy
  • Paleogeography
  • Palynology
  • Rudist limestone
  • Transdanubian range
  • Transgression-regression cycle
  • Zala Basin

ASJC Scopus subject areas

  • Geology

Cite this

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title = "Stratigraphic and sedimentological analysis of the Upper Cretaceous sequence of the Zala Basin on the basis of the investigation of the Szilv{\'a}gy-33 well",
abstract = "The Senonian succession of the Szilv{\'a}gy-33 well in the Northern Zala Basin was investigated in order to re-evaluate its chronostratigraphic subdivision and depositional history. The studied sequence begins with the Ajka Formation of reduced thickness and atypical facies. This is followed by the J{\'a}k{\'o} Formation with the interfingering layers of the Ugod Limestone, and then the approximately 300 m-thick section of the Ugod Limestone which is covered by the Pol{\'a}ny Marl. According to the palynologic and nannoplankton investigations, the entire encountered sequence can be assigned to the Campanian. The layers assignable to the Ajka Formation contain the sporomorph assemblage known from the upper section of the J{\'a}k{\'o} Formation in the Bakony basins, clearly indicating a considerable temporal shift of the lithofacies during transgression. The late transgression demonstrated in the Szilv{\'a}gy-33 well suggests an elevated paleotopography. In contrast to the former assumptions, the transgression may not have reached the Bakony region via the Zala Basin; rather, both sub-areas were invaded by the sea from the South Alpine pelagic basins.",
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