Interplay between erosion and tectonics in the Western Alps
Interplay between erosion and tectonics in the Western Alps
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DOI：
10.1111/j.1365-3121.2006.00669.x
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发表时间：
2006-04
期刊：
影响因子：
2.4
通讯作者：
M. Malusà;G. Vezzoli
中科院分区：
文献类型：
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作者：
M. Malusà;G. Vezzoli
利用基岩裂变径迹分析、高分辨率岩石学和沉积物重矿物分析研究了西阿尔卑斯山侵蚀与构造的关系。沿着奥斯塔河谷剖面，基于裂变径迹数据的西部块体的折返速率高于东部块体(0.4my1.5vs.0.1-0.3myr−1)。多拉-巴尔泰流域基于推移质分析的侵蚀速率表现出相同的模式，在相对的子流域中具有相似的幅度(0.40.7vs.0.04-0.08 mm yr−1)。结果表明，气候、地貌和岩性不是西阿尔卑斯山侵蚀的控制因素。相反，侵蚀背后的主要驱动力是导致地壳块体差异向上运动的构造。
Bedrock fission‐track analysis, high‐resolution petrography and heavy mineral analyses of sediments are used to investigate the relationships between erosion and tectonics in the Western Alps. Along the Aosta Valley cross‐section, exhumation rates based on fission‐track data are higher in the fault‐bounded western block than in the eastern block (0.4–1.5 vs. 0.1–0.3 mm yr−1). Erosion rates based on the analysis of bed‐load in the Dora Baltea drainage display the same pattern and have similar magnitudes in the relative sub‐basins (0.4–0.7 vs. 0.04–0.08 mm yr−1). Results highlight that climate, relief and lithology are not the controlling factors of erosion in the Western Alps. The main driving force behind erosion is instead tectonics that causes the differential upward motion of crustal blocks.