Abstract Dolostones in a Neogene strike-slip fault zone are described. Two main types of structural features are recognised: (i) Background deformation in the form of a network of bedding-perpendicular and hybrid conjugate fractures, barren fractures and bedding-parallel stylolites. (ii) Fault-related features include breccias and cataclasites. Orthorhombic rock lithons are generated from the intersection of fracture sets with bedding and/or joints. Lithon size and morphology change across the dolostone fault block gradually producing a tetragonal or isometric shape. The lithons are 1–2 cm in dimension (only ~ 20% outside this range) and have an average cross-sectional aspect ratio of 1.6, irrespective of size or structural position. Topology is analysed using nodes and branches, ranging from isolated (I- node and I-I branch) to connected (Y- and X-nodes, and I-C to C-C branches) respectively. The quantitative description of the geometrical and topological analysis of the dolostone lithons suggest that they become more connected and interact within the dolostone fault blocks. Assessing the change in topology and lithons connectivity have important implications for subsurface reservoirs and aquifers hosted in dolostone-fault zones.

中文翻译：

---

西班牙南部地区 Carboneras 断层带白云岩岩体的形态和拓扑结构

摘要 描述了新近系走滑断裂带中的白云岩。认识到两种主要类型的结构特征：(i) 层理垂直和混合共轭裂缝、贫瘠裂缝和层理平行缝合线网络形式的背景变形。(ii) 断层相关特征包括角砾岩和碎裂岩。斜方岩岩体是从裂缝组与层理和/或节理的交叉处产生的。横跨白云岩断块的岩体大小和形态发生变化，逐渐产生四边形或等距形状。石块的尺寸为 1-2 厘米（仅约 20% 超出此范围），平均横截面纵横比为 1.6，与尺寸或结构位置无关。使用节点和分支分析拓扑，从隔离（I-节点和II分支）到连接（Y-和X-节点，以及IC到CC分支）。对白云岩岩体的几何和拓扑分析的定量描述表明，它们在白云岩断块内变得更加连接和相互作用。评估拓扑结构和岩石连通性的变化对位于白云岩断层带的地下储层和含水层具有重要意义。