Ramp to platform evolution controlled by sea level variations: the case of the lower Givetian in Belgium.

Conference (2008)

Deposition within the vicinity of the Mid-Eifelian High : detailed sedimentological study and magnetic susceptibility of a mixed ramp-related system from the Eifelian Lauch and Nohn formations (Devonian ; Ohlesberg, Eifel, Germany)

in Facies (2008), 54

This study focuses on the base of the Eifelian stage and on the abandoned Ohlesberg quarry. The exposed section (92 m thick) is related to the Lauch and Nohn formations. Petrographic study leads to the ... [more ▼]

This study focuses on the base of the Eifelian stage and on the abandoned Ohlesberg quarry. The exposed section (92 m thick) is related to the Lauch and Nohn formations. Petrographic study leads to the defnition of 11 microfacies which are integrated in a palaeogeographical model. It corresponds to a complex ramp setting where carbonate, mixed and siliciclastic deposits coexist. The microfacies evolution is interpreted in terms of bathymetric and lateral variations, showing a general shallowing upward trend and transitions between carbonate-dominated and siliciclastic-dominated sedimentary domains. This interpretation is supported by trends in magnetic susceptibility data. Even if the proximity to emerged areas appears to be the major influence on magnetic susceptibility values, the influence of carbonate productivity and wave agitation is also noted. The Ohlesberg section clearly points to the local and regional complex facies architecture, and advocates to variegated depositional environments along the Mid-Eifelian High. [less ▲]

Magnetic susceptibility correlation of km-thick Eifelian–Frasnian sections (Belgium–Czech Republic).

in SDGG, Heft 58 – Abstract Volume – 26th IAS Regional Meeting/SEPM-CES SEDIMENT 2008 – Bochum (2008)

Carbon isotope lateral variability in a Middle Frasnian carbonate platform (Belgium): significance of facies, diagenesis and sea-level history

in Palaeogeography, Palaeoclimatology, Palaeoecology (2008), 269

Carbon isotopic variations of Frasnian shallow-water carbonates from Belgium are related to facies and major sea-level trends. The influence of the diagenetic overprint was assessed in order to determine ... [more ▼]

Carbon isotopic variations of Frasnian shallow-water carbonates from Belgium are related to facies and major sea-level trends. The influence of the diagenetic overprint was assessed in order to determine the primary signal of the Frasnian carbonates. Shallow-water microfacies are characterized by biostromes with stromatoporoids and lagoonal deposits dominated by carbonate mud and calcareous algae with subaerial exposure surfaces. The diagenetic history was controlled by three main events: early meteoric diagenesis (short-term subaerial exposure during deposition), late meteoric diagenesis (major Famennian regression) and burial diagenesis. The oxygen isotopic values are almost constant with respect to facies, original material (carbonate mud and cement) and sedimentological units (no differences before or after the main regression). This homogeneity is related to resetting during late meteoric diagenesis. The carbon isotopic values are related to facies (with the more negative values for the shallowest facies) and to major sea-level variations (most negative values after the main regression). This pattern is interpreted as being related to primary signals. This trend was enhanced by early meteoric diagenesis and the influence of more negative values from paleosols. The carbon isotope patterns reflect the influence of sea-level and water circulation on shallow water deposits and this influence implies that shallow-water carbonates are not necessarily good material for assessing the primary isotopic values of the ocean because of the influence of long residence time (“aging”) of the platform-top water and because of early diagenesis. [less ▲]

Growth and demise of a carbonate platform (Middle Devonian, Belgium) : sedimentary environments, magnetic susceptibility and stratigraphic evolution.

in SDGG, Heft 58 – Abstract Volume – 26th IAS Regional Meeting/SEPM-CES SEDIMENT 2008 – Bochum (2008)

Controlling factors on magnetic susceptiblity of mixed sediments from the Eifelian - Givetian of SW Belgium: a geochemical approach

in Book of Abstracts - 25th meeting of the IAS, Patras, Greece (2007)

from the deepest mud mound to the shallowest palaeosoils: correlations and sequence stratigraphy

in Abstract book 13th Bathurst meeting of carbonate sedimentologists (2007)

correlations and sequence stratigraphy of the Frasnian of Belgium.

in Book of Abstract - 25th meeting of the IAS - Patras (2007)

Upper Devonian carbonate platform correlations and sea level variations recorded in magnetic susceptibility

in Palaeogeography, Palaeoclimatology, Palaeoecology (2006), 240(3-4), 373-388

This paper: concerns the analysis of four outcrops in the Frasnian (Upper Devonian) of Belgium. We compare the results of a precise sedimentological analysis with magnetic susceptibility (MS) data. This ... [more ▼]

This paper: concerns the analysis of four outcrops in the Frasnian (Upper Devonian) of Belgium. We compare the results of a precise sedimentological analysis with magnetic susceptibility (MS) data. This comparison allows us to improve stratigraphic correlations and to test the relationship between magnetic susceptibility and sea level changes. Considering the sedimentological study, different microfacies have been identified, from the external belt dominated by relatively argillaceous open marine facies with crinoids, to the biostromal and the lagoonal belt dominated by algae-rich muddy facies. Fourth- and third-order sequences have also been identified and are probably related to sea level variations. Magnetic susceptibility data provides us very good fourth-order correlations and the link between magnetic susceptibility and different sedimentological parameters is obvious. More precisely, MS appears to be related to fourth- and third-order sequences and to microfacies. (c) 2006 Elsevier B.V. All rights reserved. [less ▲]

Sedimentology, magnetic susceptibility and high-resolution carbon isotope at the Early-Middle Frasnian boundary in the Ardenne area (Belgium): high-amplitude and rapid eustatic variations as potential cause of the punctata event.

Conference (2006, September)