Theoretical studies support the idea that the internal dynamics of actively deforming mountain ranges are influenced by spatial and temporal variations in climate. The identification of plausible correlations between orogen behavior and external climatic processes requires, among other factors, that the initiation and duration of any deformation event be precisely constrained. Here, we add new detrital zircon U‐Pb ages and ¹⁰Be surface exposure dating to the already extensive data set for the low‐temperature cooling history, to analyze the spatial patterns of deformation, and their temporal variations across the foreland of North Patagonia, with the aim of evaluating potential feedbacks between climate and deformation. Stratal relationships, together with geomorphic evidences of deformation document the precise timing of individual structures within the fold‐thrust belt and the broken foreland. Our data record a progressive decrease of upper‐plate shortening rates and subsidence after a first period of widespread deformation and uplift (ca. 13–7 Ma). This “transitional” foreland phase coeval to the onset of glacial conditions at 7.4–5 Ma is followed by a structural reorganization after ca. 3 Ma, marked by the abandonment of the foreland and enhanced slip on interior faults, with the intensification of glacial erosion at this time. We propose that acceleration in erosion rates during the past 7 Ma may have influenced the regional geometry and kinematic history of the orogenic belt. Our empirical results match theoretical predictions and provide compelling evidence at the scale of individual thrust faults for the significant impact of climate change on orogenic behavior.

中文翻译：

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气候对北巴塔哥尼亚安第斯山脉内山区建筑动力学的影响

理论研究支持这样一种观点，即主动变形的山脉的内部动力学受气候的时空变化影响。识别造山带行为与外部气候过程之间可能存在的相关性，除其他因素外，还要求精确限制任何变形事件的发生和持续时间。在这里，我们添加了新的碎屑锆石年龄和¹⁰表面暴露可以追溯到已有的低温冷却历史数据集，以分析变形的空间格局及其在北巴塔哥尼亚前陆的时间变化，目的是评估气候与变形之间的潜在反馈。地层关系以及变形的地貌证据证明了褶皱冲断带和前陆破碎带内单个结构的精确时机。我们的数据记录了在第一阶段的大范围变形和隆起（约13-7 Ma）之后上板缩短率和沉降的逐渐降低。这种“过渡性”前陆阶段与7.4-5 Ma的冰川条件开始同步，之后经过大约127 a的结构重组。3马 其标志是前陆被抛弃，内部断层滑动增加，此时冰川侵蚀加剧。我们提出，过去7 Ma侵蚀速率的加速可能影响了造山带的区域几何学和运动史。我们的经验结果与理论预测相符，并为气候变化对造山行为的重大影响提供了单个逆冲断层规模的有力证据。