C2: Lower Devonian palaeoclimate and sea-level changes as recorded in ramp carbonates of the Prague Basin

2 days, 26–27 June, Czech Republic; Trip leaders: Bábek O., Šimíček D.
Palacký University, Czech Republic
Contact: ondrej.babek@upol.cz
Price: 240 EUR
 
Transportation: bus; Participants: Minimum 13, Maximum 25
Departure: Prague, Hotel Diplomat (8:00); Return: Prague, Hotel Diplomat
Includes: field trip guidebook, transportation, accommodation, breakfast, lunch packets, snacks and dinner.
Degree of physical difficulty: Intermediate level of physical fitness is required. The trip will include short walks (within 1km distance), frequently on unpaved quarry floors (trekking shoes are recommended).
 
Devonian carbonate-siliciclastic ramp successions of the Prague Basin (Teplá – Barrandian Unit, Bohemian Massif) represent the type strata for several globally recognized bioevents – overturns in pelagic and benthic faunal assemblages: basal Zlíchov Event, Daleje E., Choteč E. and Kačák E., all named after the local stratigraphic units. These bioevents are coupled with distinct facies shifts along the carbonate ramp bathymetric profile and, consequently, were presumably linked to carbonate production and relative sea-level changes during the early – middle Devonian peak greenhouse climate. The Devonian strata are well exposed in many >100-m-thick sections in a number of old/active quarries which can be correlated using outcrop gamma-ray logs thus provide a very good insight into the facies architecture of the carbonate ramp systems. The field trip will focus on facies variability along the ramp bathymetric profile in 15 stops ranging from coral-bryozoan reef flank deposits through crinoidal banks, storm deposits, mass-flow breccias and carbonate turbidites to nodular pelagic limestones and shales. The facies stacking patterns and unconformities will be discussed with biostratigraphy, gamma-ray based basin-wide correlation (including practical demonstration of field GR logging), carbonate microfacies, element geochemistry and carbon isotope geochemistry into an integrated sequence-stratigraphic interpretation. The age range of the stops encompasses Lochkovian to Givetian stages, including two GSSPs localities for the base of Lochkovian (Klonk) and the base of Pragian stage.
 
 
Left: Lower Devonian (Pragian - lower Emsian) carbonate ramp succession in Velká Amerika Quarry; Right: Wavy lamination with sharp bed bases in a storm-deposit succession, Lochkovian, Hvížďalka Quarry, Prague Basin
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