Abstract
The origin of the “boudins” and the associated “interboudin” veins in the High-Ardenne slate belt (Belgium) has always been a matter of controversy. The question is whether or not they are the result of the process of boudinage. Based on geometric, microthermometric and geochemical data, we suggest a close temporal relationship between slaty-cleavage and vein development, placing the origin of the “boudins” and “interboudin” veins entirely during the Variscan compressional event. Microthermometry of the fluid inclusions in the “interboudin” veins allows constraining P–T conditions, which vary between 255 and 145MPa at 500°C.
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