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首页> 外文期刊>Terra Nova >First record of OSL-dated fluvial sands in a tropical Andean cave reveals rapid late Quaternary tectonic uplift
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First record of OSL-dated fluvial sands in a tropical Andean cave reveals rapid late Quaternary tectonic uplift

机译：在热带Andean洞穴中的OSL日期鼻腔沙子的第一次记录揭示了迅速晚期四元构造隆起

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摘要

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.
机译：我们展示了从热带安第斯山脉的河边洞穴中提取的OSL年代河流砂的首次结果。各种样品的年龄之间的极好一致性允许计算晚第四纪河谷切割率，该切割率是由秘鲁东北部活跃的亚安第斯断层传播褶皱的持续抬升造成的。构造横截面是为了理解断层传播褶皱的几何结构、历史破坏性地震和洞穴系统之间的关系。在过去70 ka期间，计算出的抬升速率为2.3至2.6 mm a（-1），可直接与西边缘基底逆冲断层的活跃传播联系起来。这与哥伦比亚和委内瑞拉亚安第斯山脉河流阶地计算的抬升率相似。研究结果将有助于更好地评估地震危险性，并确认洞穴中河流砂的OSL测年是量化活动山前隆起率的有力工具。

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