Abstract Fault zones commonly have spatially variable fault rocks and brittle structures. Differing fault-rock attributes may retard or increase cross- and along-fault permeability. Our work analyzed brittle deformation of a segment of the Patos shear zone, Triunfo Fault, which is located in the northern border of the Araripe Basin, NE Brazil. We investigated the structural evolution and tectonic implications of the Triunfo Fault by mapping damage zone width patterns and the types and distributions of breccia and brittle structure arrays within the fault zone using scanline fracture analysis techniques and topographic and aeromagnetometric data. Fractured rocks of the damage zone mainly comprise: mylonitic orthogneiss (footwall); and sandstone and carbonate rocks (hangingwall). The fault core is composed of tectonic breccia and cataclasites occurring as lenses, with calcite-filled veins. Due to fault sinuosity and rheology heterogeneities, the width of the damage zone ranges from 240 to 290m (footwall), and 372–610m (hangingwall). Our analysis obtained from the topographic and gravimetric data combined with field data indicate the following sequential deformation phases: a) Dn, Brasiliano Orogeny, dextral shear zone; b) Dn+1, Paleozoic time, brittle-ductile deformation; and c) Dn+2, Lower Cretaceous time, brittle deformation.

中文翻译：

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断层破坏带宽度：对巴西东北部阿拉里佩盆地北部边界构造演化的影响

摘要 断裂带通常具有空间可变的断层岩和脆性构造。不同的断层岩属性可能会延迟或增加跨断层和沿断层的渗透率。我们的工作分析了位于巴西东北部阿拉里佩盆地北部边界的帕托斯剪切带 Triunfo 断层的一部分的脆性变形。我们通过使用扫描线断裂分析技术以及地形和航空磁力数据绘制损伤带宽度模式以及断层带内角砾岩和脆性结构阵列的类型和分布，研究了 Triunfo 断层的结构演化和构造意义。损伤带裂隙岩主要有：糜棱正方麻岩（下盘）；和砂岩和碳酸盐岩（挂壁）。断层核心由构造角砾岩和碎裂岩组成，呈透镜状，带有充满方解石的脉。由于断层曲折性和流变非均质性，破坏带的宽度为240～290m（下盘）和372～610m（上盘）。我们从地形和重力数据结合现场数据获得的分析表明以下连续变形阶段：a) Dn，巴西造山带，右旋剪切带；b) Dn+1，古生代，脆韧变形；c) Dn+2，下白垩纪时期，脆性变形。我们从地形和重力数据结合现场数据获得的分析表明以下连续变形阶段：a) Dn，巴西造山带，右旋剪切带；b) Dn+1，古生代，脆韧变形；c) Dn+2，下白垩纪时期，脆性变形。我们从地形和重力数据结合现场数据获得的分析表明以下连续变形阶段：a) Dn，巴西造山带，右旋剪切带；b) Dn+1，古生代，脆韧变形；c) Dn+2，下白垩纪时期，脆性变形。