Abstract. Analysis of new detrital apatite fission-track (AFT) ages from modern river sands, published bedrock and detrital AFT ages, and bedrock apatite (U-Th)/He (AHe) ages from the Northern Apennines provide new insights into the spatial and temporal pattern of erosion rates through time across the orogen. The pattern of time-averaged erosion rates derived from AHe ages from the Ligurian side of the orogen illustrates slower erosion rates relative to AFT rates from the Ligurian side and relative to AHe rates from the Adriatic side. These results are corroborated by an analysis of paired AFT and AHe thermochronometer samples, which illustrate that erosion rates have generally increased through time on the Adriatic side, but decreased through time on the Ligurian side. Using an updated kinematic model of an asymmetric orogenic wedge, with imposed erosion rates on the Ligurian side that are a factor of two slower relative to the Adriatic side, we demonstrate that cooling ages and maximum burial depths are able to replicate the pattern of measured cooling ages across the orogen and estimates of burial depth from vitrinite reflectance data. These results suggest that horizontal motion is an important component of the overall rock motion in the wedge, and that the asymmetry of the orogen has existed for at least several million years.

中文翻译：

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意大利北部亚平宁山脉的挖掘和侵蚀：来自低温温度计的新见解

摘要。对来自现代河砂的新碎屑磷灰石裂变径迹 (AFT) 年龄、已发表的基岩和碎屑 AFT 年龄以及北亚平宁山脉的基岩磷灰石 (U-Th)/He (AHe) 年龄的分析提供了对时空的新见解整个造山带随时间推移的侵蚀速率模式。来自造山带利古里亚一侧的 AHe 年龄的时间平均侵蚀速率模式表明，相对于来自利古里亚一侧的 AFT 速率和相对于来自亚得里亚海一侧的 AHe 速率，较慢的侵蚀速率。这些结果通过对 AFT 和 AHe 温度计成对样本的分析得到证实，这表明亚得里亚海一侧的侵蚀率通常随着时间的推移而增加，但在利古里亚一侧会随着时间的推移而下降。使用非对称造山楔的更新运动学模型，由于利古里亚一侧的侵蚀速率比亚得里亚海一侧慢两倍，我们证明冷却年龄和最大埋藏深度能够复制整个造山带测量的冷却年龄模式和镜质体的埋藏深度估计反射率数据。这些结果表明，水平运动是楔形整体岩石运动的重要组成部分，造山带的不对称性至少已经存在了几百万年。