The correlation potential of magnetic susceptibility and outcrop gamma-ray logs at Tournaisian-Viséan boundary sections in western Europe

We have measured five deep-water carbonate and carbonate-siliciclastic sections at the Tournaisian-Visean (Tn/V) boundary in western Europe, using petrophysical outcrop logging techniques (gamma-ray spectrometry /GRS/ and magnetic susceptibility /MS/). The aim was to trace correlatable log patterns across the flanks of the London-Brabant Massif from eastern Ireland to western Germany. Both GRS and MS logging proved useful for long-distance (up to similar to 1000 km) correlation. The log patterns can be interpreted in terms of sea-level fluctuations. A late Tournaisian regression, a sequence boundary at the Tn/V boundary, early Visean lowstand systems tract and an overlying transgressive to regressive succession can be identified from the GRS and MS logs. The Tn/V sequence boundary can be correlated with exposure features and karstic surfaces in the up-dip shallow-water settings at the boundary between sequence 4 and 5 of Hance et al. (2001, 2002). This indicates that sea-level fluctuations around the Tn/V boundary were synchronous and traceable on the flanks of the London-Brabant Massif. The GRS-based logging has a greater correlation potential than MS as it can be applied in a broad spectrum of facies and depositional settings. In certain sections, the MS signal shows an increasing trend during transgression and a decreasing during regression, which is opposite to the MS paradigm from shallow-water carbonate platform settings. These trends are assumed to result from landward/basinward facies shifts of low-productivity carbonate ramp systems. Lowstand shedding of carbonate tempestites and turbidites results in low MS values while during sea-level rise the ramp systems backstep, developing retrograding facies successions in their distal parts, which are associated with upward-increasing MS values

Data for: Million-year secular variations in the elemental geochemistry of Devonian marine records and a link to global climate and bioevents; Prague Basin, Czech Republic

A complete geochemical dataset including ICP-MS (inductively-coupled plasma mass spectrometry) data, TOC (total organic carbon) data, EDXRF (energy-dispersive X-ray fluorescence) data and a data file with calibration equations based on cross-correlation of ICP-MS and EDXRF data, along with section and sample identification and assignment to lithostratigraphic units indicated in the text, tables and figures

Data for: Reservoir deltas and their role in pollutant distribution in valley-type dam reservoirs: Les Království Dam, Elbe River, Czech Republic

Sediment grain size data, EDXRF geochemical data, ICP-MS data, ICP-OES data, PAH concentrations, gamma-ray spectrometric data including 137Cs mass activities and a set of 30 ground-penetration radar profile

Data for: Million-year secular variations in the elemental geochemistry of Devonian marine records and a link to global climate and bioevents; Prague Basin, Czech Republic

A complete geochemical dataset including ICP-MS (inductively-coupled plasma mass spectrometry) data, TOC (total organic carbon) data, EDXRF (energy-dispersive X-ray fluorescence) data and a data file with calibration equations based on cross-correlation of ICP-MS and EDXRF data, along with section and sample identification and assignment to lithostratigraphic units indicated in the text, tables and figures.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

Data for: Reservoir deltas and their role in pollutant distribution in valley-type dam reservoirs: Les Království Dam, Elbe River, Czech Republic

Sediment grain size data, EDXRF geochemical data, ICP-MS data, ICP-OES data, PAH concentrations, gamma-ray spectrometric data including 137Cs mass activities and a set of 30 ground-penetration radar profilesTHIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

The Pragian in the Prague Synform: Questions, Duration and Global correlation.

peer reviewe

Pleistocene speleothem fracturing in the Western Carpathian orogenic foreland : A case study from transtensional setting at the eastern margin of the Bohemian Massif

We studied speleothem-fracturing styles and their tectonic context in three cave systems situated in the eastern Bohemian Massif, close to the Western Carpathians orogenic front: the Za hájovnou, Javoříčko, and Mladeč caves. The morphology of the speleothems in particularly thin stalactites, and supporting evidence from the cave interior, indicates a tectonic origin of the breakage. U/Th series dating of the stalactites, supported by Optically Stimulated Luminiscence (OSL) and 14C dating of soft sediments indicate that most of the fracturing occurred in the Upper Pleistocene, with the last fracturing events corresponding to MIS6 and MIS5 stages. OSL dating of faulted soft-sediment infill may even indicate that latest Pleistocene to Early Holocene tectonic events occurred in the Mladeč Cave. The speleothem fracturing is discussed in the regional context of the seismically active Nysa-Morava Zone situated at the junction between the Bohemian Massif (Elbe Fault Zone) and the Western Carpathians. This study provides the first evidence of palaeoseismicity from the subsurface and the oldest dated palaeoseismicity from the contact between the Western Carpathians and the Bohemian Massif