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.

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