Abstract
In the Ardennes area, pelitic schists of Cambrian to Early Devonian age have experienced a low-grade polyphase metamorphism which can be characterised by changes in magnetic mineralogy. Using mainly rock magnetic tools we have defined various iron oxides and sulphide assemblages allowing a magnetic mineralogy “zoneography” of the Ardennes metamorphism to be constructed. Low-temperature and three-axial IRM measurements identify pyrrhotite in the southern part of the massif. This mineral had not been previously recognised in the Ardennes area. In the Devonian cover, toward the metamorphic apex, the appearance of coarse-grained haematite is characterised by low coercivity values. The trends of low field and anhysteretic susceptibilities allow a discrimination between the lithologic and metamorphic effects to be made. Additionally, the relative contributions of an early metamorphic event and the classical metamorphism linked to the Variscan shortening are discussed.
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