Abstract This work is focussed on the geomorphological changes related to the Pleistocene capture of the formerly endorheic Guadix-Baza basin (Betic Cordillera). We explore the possible tectonic controls in the basin opening through a combined geomorphological and structural study. For this, we have selected a study area that includes the connecting zone between the former endorheic basin and the capture channel (Guadiana Menor River). This zone also includes the SE end of the so-called Tiscar Fault Zone (TFZ) that has been active during the Upper Miocene and onwards. We use the glacis surface that marks the end of the endorheic sedimentation (Middle-Upper Pleistocene), as the main reference surface to identify recent deformation structures. Our results indicate that the main channel crossing the Pozo Alcon glacis (Guadalentin River) shows evidence of high levels of fluvial incision and that some anomalies in the stream longitudinal profile could be correlated to the presence of pre-glacis faults linked to the TFZ. Conversely, abrupt changes in the stream orientation seems to be related to post-glacis downthrow faults. We have identified that the dextral strike-slip Tiscar Fault (the northern boundary of the TFZ) propagates towards the SE as far as the Guadalentin River, giving rise to a deformation band with oblique slip that descends the SW block down to 250 m and affects the glacis surface. Additionally, the Pozo Alcon glacis has undergone distributed deformation mainly achieved by N-S to NE-SW downthrow faults and subordinate WNW faults. The roughly E-W extension within the Pozo Alcon glacis can be interpreted as developed in the extensional lobe at the tip of a dextral strike-slip fault (the Tiscar Fault). According to the orientation (WNW-ESE) and location of the Guadiana Menor River (following the southern boundary of the TFZ), and the relief attenuation and tilting produced by the extensional systems in the Pozo Alcon glacis, we interpret that the later stages of TFZ activity probably controlled and favoured the localisation of the basin capture.

中文翻译：

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最近断层控制的冰川变形及其在瓜迪克斯-巴扎盆地（西班牙南部贝蒂科迪勒拉）河流捕获中的作用

摘要 这项工作的重点是与更新世捕获以前内陆的瓜迪克斯-巴扎盆地 (Betic Cordillera) 相关的地貌变化。我们通过结合地貌和结构研究探索盆地开口可能的构造控制。为此，我们选择了一个研究区域，其中包括前内陆盆地和捕获通道（瓜迪亚纳梅诺河）之间的连接带。该带还包括在上中新世及以后一直活跃的所谓蒂斯卡断层带 (TFZ) 的东南端。我们使用标志着内流沉积结束（中上更新世）的冰川表面作为识别近期变形结构的主要参考表面。我们的结果表明，穿越 Pozo Alcon 冰川（瓜达连廷河）的主要河道显示出大量河流切口的证据，并且河流纵向剖面中的一些异常可能与与 TFZ 相关的冰川前断层的存在相关。相反，河流方向的突然变化似乎与冰川后倾倒断层有关。我们已经确定右旋走滑 Tiscar 断层（TFZ 的北边界）向东南传播，直到瓜达伦丁河，产生一个带有倾斜滑动的变形带，使 SW 块下降到 250 m 并影响冰川表面。此外，Pozo Alcon 冰川经历了主要由 NS 到 NE-SW 下行断层和从属 WNW 断层实现的分布变形。Pozo Alcon 冰川内的大致 EW 延伸可以解释为在右旋走滑断层（Tiscar 断层）尖端的伸展叶中发育。根据瓜迪亚纳梅诺河（沿 TFZ 南边界）的方位（WNW-ESE）和位置，以及 Pozo Alcon 冰川伸展系统产生的地势衰减和倾斜，我们解释为TFZ 活动可能控制并有利于盆地捕获的定位。