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.

面对 High-Ardenne 板岩带（比利时）中具有复杂脉壁-叶理横切关系的不协调石英脉，我们开发了一个新术语来描述主体织物元素和横切元素之间的几何关系。这个新术语在描述脉壁-叶理几何时引入了方向感。将这一新术语应用于一系列具有复杂程度不同的脉壁-叶理横切关系的石英脉，允许根据两种类型的脉壁-叶理几何对所研究的脉进行分类。虽然第一个静脉壁叶理几何表明在静脉形状修改期间静脉充当了主管对象，第二个静脉壁-叶理几何表明，静脉形状的改变是由于充满液体的空腔变形而导致的，这些空腔具有非常移动的静脉壁。基于这些例子，我们初步证明了新的几何术语可能为具有复杂静脉壁-叶理横切关系的不规则静脉的运动学分析带来有用的附加元素。