Geologica Belgica

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Timothy DEBACKER, Alain HERBOSCH & Jacques VERNIERS

The presumed Upper Ordovician green rocks at Rebecq re-interpreted as a resurfacing of the Cambrian Oisquercq Formation (Senne Valley, Anglo-Brabant Deformation Belt, Belgium)

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Mots-clés : Lower Palaeozoic, stratigraphy, Asquempont Detachment System, Oisquercq Formation, geochemistry, Asquempont Member, magnetic properties

Abstract

Lithological, magnetic and geochemical data do not allow distinguishing the homogenous, green cleaved mudstone at Rebecq (Senne Valley), defined as the Upper Ordovician Hospice de Rebecq Formation by Herbosch (2005), from those of the Asquempont Member of the Lower to lower Middle Cambrian Oisquercq Formation. Moreover, structural geological considerations and new mapping show that the geology of the Rebecq area is better explained by re-considering the homogenous, green cleaved mudstone at Rebecq as a local resurfacing of the Asquempont Member of the Oisquercq Formation in the footwall of the Asquempont Detachment System. Using this idea, a new geological map is presented of the Rebecq area. As the rocks at Rebecq, in the type locality of the Hospice de Rebecq Formation, are better re-considered as belonging to the Asquempont Member of the Oisquercq Formation, the name Hospice de Rebecq Formation should be abandoned.  This in turn, implies that also the green rocks of the Grand-Manil area (Orneau Valley), previously considered as belonging to the Hospice de Rebecq Formation, should be renamed. For the latter, we propose the name Cimetière de Grand-Manil Formation.

To cite this article

Timothy DEBACKER, Alain HERBOSCH & Jacques VERNIERS, «The presumed Upper Ordovician green rocks at Rebecq re-interpreted as a resurfacing of the Cambrian Oisquercq Formation (Senne Valley, Anglo-Brabant Deformation Belt, Belgium)», Geologica Belgica [En ligne], volume 14 (2011), number 3-4, 249-264 URL : http://popups.ulg.ac.be/1374-8505/index.php?id=3422.

About: Timothy DEBACKER

Department of Geology and Soil Science, Ghent University, Belgium. E-mail: timothy.debacker@ugent.be

About: Alain HERBOSCH

Département des Sciences de la Terre et de l’Environnement, Université Libre de Bruxelles, Belgium. E-mail: herbosch@ulb.ac.be

About: Jacques VERNIERS

Department of Geology and Soil Science, Ghent University, Belgium