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)

Timothy DEBACKER; Alain HERBOSCH; Jacques VERNIERS

Geologica Belgica

1374-8505 2034-1954

Facteur d'impact : 1.8 (2022)

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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)

(volume 14 (2011) — number 3-4)

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Annexes

Debacker et al. (3,3M)

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.

Pour citer cet 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 : https://popups.uliege.be/1374-8505/index.php?id=3422.