Basement fault reactivation, and the growth, interaction, and linkage with new fault segments are fundamentally three-dimensional and critical for understanding the evolution of fault network development in sedimentary basins. This paper analyzes the evolution of a complex, basement-involved extensional fault network on the Enderby Terrace on the eastern margin of the Dampier sub-basin, North West Shelf of Australia. A high-resolution, depth-converted, 3-D seismic reflection data volume is used to show that multiphase, oblique extensional reactivation of basement-involved faults controlled the development of the fault network in the overlying strata. Reactivation of the pre-existing faults initially led to the formation of overlying, en échelon Late Triassic–Middle Jurassic fault segments that, as WNW-directed rifting progressed on the margin, linked by breaching of relay zones to form two intersecting fault systems (F1 and F2–F4). Further reactivation in the latest Jurassic–Early Cretaceous (NNW-SSE extension) produced an additional set of en échelon fault arrays in the cover strata. The final fault network consists of main or principal faults and subordinate or splay faults, together with branch lines that link the various components. Our study shows that breaching of relay ramps and/or vertical linkages produces vertical and horizontal branch lines giving complex final fault geometries. We find that repeated activity of the basement-involved faults tends to form continuous and planar fault architectures that favor displacement transfer between the main constituent segments along strike and with depth.

中文翻译：

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澳大利亚西北大陆架 Enderby Terrace 多相伸展过程中形成的基底涉及断层网络的三维几何形状和生长

基底断层再活化，以及与新断层段的生长、相互作用和联系从根本上说是三维的，对于理解沉积盆地断层网络发展的演化至关重要。本文分析了澳大利亚西北大陆架丹皮尔次盆地东缘恩德比台地一个复杂的、涉及基底的伸展断层网络的演化。使用高分辨率、深度转换的 3-D 地震反射数据体表明，涉及基底的断层的多相、倾斜伸展再激活控制了上覆地层中断层网络的发展。先前存在的断层的重新激活最初导致上覆的、梯形的晚三叠世-中侏罗世断层段的形成，随着 WNW 导向的裂谷在边缘进展，通过突破中继区连接形成两个交叉的断层系统（F1 和 F2-F4）。在最新的侏罗纪-早白垩世（NNW-SSE 延伸）中的进一步活化在覆盖层中产生了一组额外的梯级断层阵列。最终的故障网络由主要或主要故障和从属或张开故障以及连接各个组件的支线组成。我们的研究表明，中继斜坡和/或垂直连接的破坏会产生垂直和水平分支线，从而产生复杂的最终断层几何形状。我们发现涉及基底的断层的重复活动倾向于形成连续的平面断层结构，有利于主要组成部分之间沿着走向和深度的位移转移。