Facets are major topographic features built over several 100 k.y. above active normal faults. Their development integrates cumulative displacements over a longer time frame than many other geomorphological markers, and they are widespread in diverse extensional settings. We have determined the ³⁶Cl cosmogenic nuclide concentration on limestone faceted spurs at four sites in the Central Apennines (Italy), representing variable facet height (100–400 m). The ³⁶Cl concentration profiles show nearly constant values over the height of the facet, suggesting the facet slope has reached a steady-state equilibrium for ³⁶Cl production. We model the ³⁶Cl buildup on a facet based on a gradual exposure of the sample resulting from fault slip and denudation. Data inversion with this forward model yields accurate constraints on fault slip rates over the past 20–200 k.y., which are in agreement with the long-term rate independently determined on some of those faults over the past 1 m.y. ³⁶Cl measurements on faceted spurs can therefore constrain fault slip rate over time spans as long as 200 k.y., a time period presently undersampled in most morphotectonic studies.

中文翻译：

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由正常断裂面上的宇宙成因核素确定的滑移率

构面是主要的地形特征，比活动的正常断层高出数百ky。与许多其他地貌标记相比，它们的发展在更长的时间内整合了累积位移，并且它们广泛分布在不同的伸展环境中。我们已经确定了亚平宁山脉中部（意大利）四个地点的石灰石多面刺骨上³⁶ Cl的宇宙成因核素浓度，代表了不同的小面高度（100-400 m）。的^36个氯浓度分布显示几乎恒定的值过小面的高度，这表明小面的斜率已经到达了稳态平衡³⁶氯生产。我们为³⁶建模基于断层滑动和剥蚀导致的样品逐渐暴露，Cl堆积在刻面上。这种正向模型数据反演得出在过去的20-200 KY故障滑动速率准确的限制，这是在与一些这些故障过去1个我的独立确定长期利率协议^36个氯的方位马刺测量可以因此，将断层滑动率限制在200 ky之内，这是目前大多数构造构造研究中取样不足的时期。