Abstract
Confronted with discordant quartz veins with complex vein wall-foliation crosscutting relationships in the High-Ardenne slate belt (Belgium), we developed a new terminology to describe the geometrical relationship between host fabric elements and crosscutting elements. This new terminology introduces a directional sense in the description of the vein wall-foliation geometry. Applying this new terminology on a series of quartz veins with vein wall-foliation crosscutting relationships of variable degrees of complexity, allowed to categorize the veins studied according to two types of vein wall-foliation geometry. While the first vein wall-foliation geometry suggests that the veins acted as competent objects during vein-shape modification, the second vein wall-foliation geometry suggests that the vein-shape modification resulted from deforming fluid-filled cavities with very mobile vein walls. Based on these examples, we tentatively demonstrate that the new geometrical terminology may bring useful, additional elements to the kinematic analysis of irregular veins with complex vein wall-foliation crosscutting relationships.
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