Geologica Belgica

1374-8505 2034-1954

 

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Frédéric BOULVAIN, Anne-Christine DA SILVA, Cédric MABILLE, Jindrich HLADIL, Milan GERSL, Leona KOPTIKOVA & Petr SCHNABL

Magnetic susceptibility correlation of km-thick Eifelian–Frasnian sections (Ardennes and Moravia)

(volume 13 (2010) — number 4 - Magnetic susceptibility, correlations and Palaeozoic environments)
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Mots-clés : magnetic susceptibility, Devonian limestone, Moravian karst, Ardennes.

Abstract

After briefly introducing the sedimentology of two Eifelian-Frasnian carbonate sections in Belgium and Moravia, this paper focuses on the comparison of the magnetic susceptibility (MS) curves. The Ardennes section shows highly variable facies, with an alternation of ramp, platform and mound environments. Detrital inputs are locally very important. Time-equivalent facies in the area of the Moravian Karst correspond to rather pure carbonate platform facies, mostly composed of Amphipora beds. This first analyse of long-term trends in Devonian MS in Belgium and Moravia shows a remarkable similarity, despite a very different background of palaeogeographical setting, facies, sedimentary rate and retrogradation-progradation history. However, a relative independence of the MS and the distal-proximal curves, deduced either from the microfacies record (Ardennes) or from shoreline shifts (Moravia) is observed. This questions the nature of the forcing mechanisms that must at least be active at the inter-regional scale. Moravia and the Ardennes are located along the same palaeolatitude, perhaps suggesting some climatically driven mechanisms, responsible for the input of the detrital fraction responsible for the MS in these sediments. Trade winds are potentially responsible for transportation of dust and its widespread distribution in intertropical areas.

Om dit artikel te citeren:

Frédéric BOULVAIN, Anne-Christine DA SILVA, Cédric MABILLE, Jindrich HLADIL, Milan GERSL, Leona KOPTIKOVA & Petr SCHNABL, «Magnetic susceptibility correlation of km-thick Eifelian–Frasnian sections (Ardennes and Moravia)», Geologica Belgica [En ligne], number 4 - Magnetic susceptibility, correlations and Palaeozoic environments, volume 13 (2010), 309-318 URL : http://popups.ulg.be/1374-8505/index.php?id=3175.

Over : Frédéric BOULVAIN

Pétrologie sédimentaire, B20, Université de Liège, Sart Tilman, B-4000 Liège, Belgique

Over : Anne-Christine DA SILVA

Pétrologie sédimentaire, B20, Université de Liège, Sart Tilman, B-4000 Liège, Belgique

Over : Cédric MABILLE

TOTAL E&P, CSTJF, 18 avenue Larribau, 64018 Pau, France

Over : Jindrich HLADIL

Institute of Geology AS CR, v.v.i. Rozvojova 269, 165 00 Prague 6, Czech Republic

Over : Milan GERSL

Czech Geological Survey, branch Brno, Leitnerova 22, 658 69 Brno, Czech Republic

Over : Leona KOPTIKOVA

Institute of Geology AS CR, v.v.i. Rozvojova 269, 165 00 Prague 6, Czech Republic

Over : Petr SCHNABL

Institute of Geology AS CR, v.v.i. Rozvojova 269, 165 00 Prague 6, Czech Republic