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- Volume 94 (1971)
- Fascicule 3
- Le prolongement de la zone métamorphique de Bastogne au Grand-Duché de Luxembourg
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Le prolongement de la zone métamorphique de Bastogne au Grand-Duché de Luxembourg
Abstract
In the Belgian Central Ardennes, belts of synkinematic metamorphism of a low pressure type follow the southern flanks of the major anticlinorial upheavals. It is shown that the principal belt, the Bastogne metamorphic zone, extends towards the NE into Luxemburg where it dies out together with the supporting anticlinorial structure. The metamorphism cuts across the stratigraphic sequence and reaches higher levels than hitherto supposed. Its last effects are seen in dark sericitic roofing slates of Upper Siegenian age. They consist of small tabular ilmenite and calcite porphyroblasts, and of pyrrhotite grains with pentlandite exsolutions produced at the expense of sedimentary pyrite.