Rapid exhumation in the Western Alps driven by slab detachment and glacial erosion
Rapid exhumation in the Western Alps driven by slab detachment and glacial erosion
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DOI：
10.1130/g36411.1
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发表时间：
2015-05-01
期刊：
影响因子：
5.8
通讯作者：
Willett, Sean D.
中科院分区：
文献类型：
--
作者：
Fox, Matthew;Herman, Frederic;Willett, Sean D.
确定地形和侵蚀速率对构造和气候强迫的响应仍然具有挑战性。这部分是因为很难将气候和构造的各自作用分开。在这里，我们利用2500 thermochronometric数据点收集了几十年的研究，使用一种新的逆技术，图像的时空演变的侵蚀率在欧洲阿尔卑斯山在过去的35万年。我们研究结果中最显著的特征是，在过去的200万年里，侵蚀速率增加了两到三倍。仅限于阿尔卑斯山脉的西部和中部。这种增加似乎是由推断的高岩石隆起率，由于欧洲板块在西阿尔卑斯山下的进步剥离控制。西部和东部的阿尔卑斯山之间的平均海拔的相似性表明了令人惊讶的低地形响应这种差异构造强迫，并指出了增强冰川侵蚀的作用，在响应表面隆起。
Identifying topographic and erosion rate response to tectonic and climatic forcing remains challenging. This is in part because of the difficulty in isolating the respective roles of climate and tectonics. Here we exploit 2500 thermochronometric data points collected over several decades of research, using a new inverse technique, to image the space-time evolution of erosion rate across the European Alps over the past 35 m.y. The most striking feature of our results is a two- to three-fold increase in erosion rate over the past 2 m.y. exclusively within the Western and Central Alps. This increase appears to be controlled by the inferred high rock uplift rate due to the progressive detachment of the European slab under the Western Alps. The similarity in mean elevation between the Western and Eastern Alps indicates a surprisingly low topographic response to this differential tectonic forcing, and points to the role of enhanced glacial erosion in response to surface uplift.