The height of a thrust-fault scarp on a fluvial terrace would be modified due to erosion and deposition, and these surface processes can also influence the dating of terraces. Under such circumstances, the vertical slip rate of a fault can be misestimated due to the inaccurate displacement and/or abandonment age of the terrace. In this contribution, considering the effect of erosion and deposition on fault scarps, we re-constrained the vertical slip rate of the west end of the Minle-Damaying Fault (MDF), one of the thrusts in the north margin of the Qilian Shan that marks the northeastern edge of the Tibetan Plateau. In addition, we tried to explore a more reliable method for obtaining the vertical fault displacement and the abandonment age of terraces with AMS 14C dating. The Monte Carlo simulation method was used to estimate the uncertainties of fault displacements and vertical slip rates. Based on comparative analysis, the dating sample from the fluvial sand layer underlying the thickest loess in the footwall was suggested to best represent the abandonment age of the terrace, and the fluvial gravel layer could better preserve the original vertical fault displacement compared with the surface layer. Using the most reliable ages and vertical offsets, the vertical slip rate of the MDF was estimated to be 0.25-0.28 mm/a since 42.3 ± 0.5 ka (T10) and 0.14-0.24 mm/a since 16.1 ± 0.2 ka (T7). The difference between the wrong vertical slip rate and the right one can even reach an order of magnitude. We also suggest that if the built measuring profile is long enough, the uncertainties in the height of a surface scarp would be better constrained and the result can also be taken as the vertical fault displacement. Furthermore, the consistency of chronology with stratigraphic sequence or with terrace sequence are also key to constraining the abandonment ages of terraces. The fault activity at the study site is weaker than that in the middle and east segments of the MDF, which is likely due to its end position.

中文翻译：

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冲蚀和沉积对冲断断层垂直滑移率的影响-以青藏高原北祁连山民乐-大马营断层为例

由于侵蚀和沉积作用，河流阶地上的冲断断层陡坡的高度会发生变化，这些表面过程也会影响阶地的年代。在这种情况下，由于梯田的不正确位移和/或废弃年龄，可能会错误估计断层的垂直滑移率。在此贡献中，考虑到侵蚀和沉积对断层陡坡的影响，我们重新限制了Minle-Damaying断层（MDF）西端的垂直滑移速率，MDF是祁连山北缘的推力之一，标志着青藏高原的东北边缘。此外，我们试图探索一种更可靠的方法，以获取AMS 14C测年的垂直断层位移和阶地的废弃年龄。蒙特卡罗模拟方法被用来估计断层位移和垂直滑移率的不确定性。基于比较分析，建议在底盘最厚黄土下面的河流砂层测年样品最好地代表阶地的废弃年龄，并且与表面层相比，河流砾石层可以更好地保留原始的垂直断层位移。 。使用最可靠的年龄和垂直偏移量，自42.3±0.5 ka（T10）起，MDF的垂直滑移率估计为0.25-0.28 mm / a，自16.1±0.2 ka（T7）起估计为0.14-0.24 mm / a。错误的垂直滑移率和正确的垂直滑移率之间的差异甚至可以达到一个数量级。我们还建议，如果构建的测量配置文件足够长，更好地限制了表面陡峭高度的不确定性，其结果也可作为垂直断层位移。此外，年代学与地层层序或阶地层序的一致性也是限制阶地放弃年龄的关键。研究地点的断层活动比中密度纤维板中东部的断层活动弱，这很可能是由于其最终位置所致。