We present the first results of OSL‐dated fluvial sands extracted from a riverside cave in the tropical Andes. The excellent agreement between the ages of the various samples allowed the calculation of a late Quaternary valley incision rate forced by ongoing uplift of an active Subandean fault‐propagation fold in NE Peru. A structural cross‐section was constructed to understand the relationship between the geometry of the fault‐propagation fold, historical damaging earthquakes and the cave system. The calculated uplift rate is 2.3 to 2.6 mm a⁻¹ over the past 70 ka and can be directly linked to active propagation of west‐verging basement thrusts. It is similar to uplift rates calculated from fluvial terraces in the Subandes of Colombia and Venezuela. The results will help to better assess the seismic hazard and confirm that OSL dating of fluvial sands in caves is a powerful tool to quantify uplift rates of active mountain fronts.

中文翻译：

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在热带的安第斯山洞中，OSL沉积的河床砂的首次记录揭示了第四纪晚期构造快速抬升

我们介绍了从热带安第斯山脉的河边洞穴中提取的OSL型河床砂的初步结果。各个样本年龄之间的极好的一致性允许计算秘鲁北部东北部一个活跃的苏巴第斯断层传播褶皱的持续抬升而强迫的第四纪晚期山谷切开速率。为了了解断层传播褶皱的几何形状，历史破坏性地震与洞穴系统之间的关系，构造了一个结构剖面。计算的提升速率为2.3至2.6 mm a ^-1在过去的70 ka内，可以直接与西向基底冲动的活跃传播联系起来。它类似于哥伦比亚和委内瑞拉Subandes河流阶地计算的上升速率。研究结果将有助于更好地评估地震危险性，并确认洞穴中河床砂的OSL测年是量化活跃山峰抬升速率的有力工具。