Early Badenian transgression on the outer flank of Western Carpathian Foredeep, Hluchov area, Czech Republic

Šárka Hladilová, Slavomír Nehyba, Kamil Zágoršek, Pavla Tomanová Petrová, Maria Aleksandra Bitner, A. Demény

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

This multidisciplinary study, based on borehole cores from the Hluchov area in Czech Republic, documents an early Badenian marine transgression on the outer flank of the Western Carpathian Foredeep. The shallow-marine deposits represent coastal transgression over a terrestrial topography of weathered pre-Cenozoic bedrock. The lower facies association (FA1) consists of siliciclastic sediment derived from local substrate erosion. Facies indicate a wave-dominated environment with unstable bottom, variable rate of sediment supply and an incremental rise of relative sea level. The upper facies association (FA2) consists of carbonates indicating a major landward shift of shoreline, decline in siliciclastic input and further sea-level rise. The succession represents a transgressive to highstand systems tract. The maximum flooding surface, ca. 1 m above the FA1/FA2 boundary, is signified by an anomalous decrease in K and Th, an increased Th/K ratio and highest U concentration. The heavy-mineral assemblages in FA1 confirm local sediment provenance, whereas those in FA2 indicate broader sediment derivation, including volcanic component from contemporaneous rhyolitic to rhyodacitic eruptions. The deposits contain a wide range of marine fauna, with the foraminifers and molluscs indicating an early Badenian age. Molluscs, bryozoans and echinoderms indicate a normal-salinity environment with a decreasing hydraulic energy. Foraminifers indicate salinity fluctuations in the lowest part of the succession. The isotopic composition of mollusc shells shows marked inter-species differences and a general negative shift in the δ13C and δ18O values, indicating diagenetic alteration. The impact of diagenetic processes appears to have been controlled by sedimentary facies. The highly negative δ13C and δ18O values correspond to sediment layers with the highest Th/K ratios and hence low clay content. Sediment permeability was thus probably crucial in controlling the differential circulation and impact of diagenetic fluids.

Original languageEnglish
Pages (from-to)259-279
Number of pages21
JournalAnnales Societatis Geologorum Poloniae
Volume84
Issue number3
Publication statusPublished - 2014

Fingerprint

Badenian
forearc basin
transgression
mollusc
sediment
foraminifera
salinity
systems tract
echinoderm
highstand
heavy mineral
provenance
shoreline
bedrock
isotopic composition
volcanic eruption
flooding
borehole
topography
sea level

Keywords

  • Borehole cores
  • Carpathian Foredeep
  • Early Badenian
  • Geochemistry
  • Marine transgression
  • Palaeontology
  • Sedimentology

ASJC Scopus subject areas

  • Stratigraphy
  • Geology
  • Economic Geology

Cite this

Early Badenian transgression on the outer flank of Western Carpathian Foredeep, Hluchov area, Czech Republic. / Hladilová, Šárka; Nehyba, Slavomír; Zágoršek, Kamil; Petrová, Pavla Tomanová; Bitner, Maria Aleksandra; Demény, A.

In: Annales Societatis Geologorum Poloniae, Vol. 84, No. 3, 2014, p. 259-279.

Research output: Contribution to journalArticle

Hladilová, Š, Nehyba, S, Zágoršek, K, Petrová, PT, Bitner, MA & Demény, A 2014, 'Early Badenian transgression on the outer flank of Western Carpathian Foredeep, Hluchov area, Czech Republic', Annales Societatis Geologorum Poloniae, vol. 84, no. 3, pp. 259-279.
Hladilová, Šárka ; Nehyba, Slavomír ; Zágoršek, Kamil ; Petrová, Pavla Tomanová ; Bitner, Maria Aleksandra ; Demény, A. / Early Badenian transgression on the outer flank of Western Carpathian Foredeep, Hluchov area, Czech Republic. In: Annales Societatis Geologorum Poloniae. 2014 ; Vol. 84, No. 3. pp. 259-279.
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