Geologica Belgica

1374-8505

 

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Maurice STREEL, Michel VANGUESTAINE, Andrés PARDO-TRUJILLO1 & Eric THOMALLA

THE FRASNIAN-FAMENNIAN BOUNDARY SECTIONS AT HONY AND SINSIN (ARDENNE, BELGIUM): NEW INTERPRETATION BASED ON QUANTITATIVE ANALYSIS OF PALYNOMORPHS, SEQUENCE STRATIGRAPHY AND CLIMATIC INTERPRETATION

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Mots-clés : Belgium, Ardenne, Sequence Stratigraphy, paleoclimate, KEYWORDS: palynology, Frasnian-Famennian Boundary

Abstract

ABSTRACT. In the light of recent geochemical and sedimentological investigations, the Frasnian-Famennian Bound­ary sections at Hony and Sinsin (eastern and central Ardenne, Belgium) are re-evaluated in terms of quantitative analy­sis of spiny acritarchs and miospores. It is concluded that the shaly interval separating the limestone beds dated Frasnian and Famennian by conodonts corresponds to a transgressive - regressive marine sequence. This interpretationion is supported, for the Hony section, by a quantitative analysis of two spiny acritarch groups (Gorgonisphaeridium gr. and Micrhystridium gr.) based on the relationship between their abundance and the depth of the marine environment. It is also corroborated by the frequency distribution of a Prasinophyceae (Maranhites stockmansii) indicative for a maxi­mum flooding surface. A sequence stratigraphie model and the possible causes of the bathymétrie changes right at the Frasnian-Famennian Boundary are briefly discussed. It is suggested that these changes are related to a short glacial phase during a "warm mode" period.

To cite this article

Maurice STREEL, Michel VANGUESTAINE, Andrés PARDO-TRUJILLO1 & Eric THOMALLA, «THE FRASNIAN-FAMENNIAN BOUNDARY SECTIONS AT HONY AND SINSIN (ARDENNE, BELGIUM): NEW INTERPRETATION BASED ON QUANTITATIVE ANALYSIS OF PALYNOMORPHS, SEQUENCE STRATIGRAPHY AND CLIMATIC INTERPRETATION», Geologica Belgica [En ligne], number 3-4, volume 3 (2000), 271-283 URL : http://popups.ulg.ac.be/1374-8505/index.php?id=2215.

About: Maurice STREEL

University of Liège, Paleontology, Sart-Tilman B 18, B-4000 LIEGE 1, Belgium

About: Andrés PARDO-TRUJILLO1

Universidad de Caldas, Departamento de Ciencias Geológicas, Calle 65 #26-10, MANIZALES, Columbia

About: Eric THOMALLA

University of Liège, Paleontology, Sart-Tilman B 18, B-4000 LIEGE 1, Belgium