Tectonic Erosion Along the Southern Chile Margin

趋同的边际已经被证明是两种类型。沉积边缘反映了洋壳俯冲过程中沉积物质向上覆地壳板块的添加。侵蚀边缘反映了地壳物质的构造剥离及其被俯冲的洋壳向深处的输送。了解这两类边缘的原因对于确定全球沉积物质平衡、地壳和地幔之间的元素循环至关重要，并可能有助于揭示沿会聚边缘产生地震的特征和过程。本奖项将支持对智利边缘的审查，这是一个由于活跃的扩张中心的俯冲而产生的强烈侵蚀地区。具体地说，多道地震反射数据将从边缘的未受干扰的剖面进行处理，并与来自高度侵蚀的剖面的详细数据分析进行比较。这些数据集的比较将为边际结构和侵蚀的时间变化提供独特的图景。

Convergent margins have been shown to be of two types. Accretionary margins reflect the addition of sedimentary material to an overriding crustal plate during underthrusting of oceanic crust. Erosional margins reflect tectonic stripping of crustal material and its transport to depth by the underthrusting ocean crust. Understanding the reasons for these two types of margins is critical in determining global sedimentary mass balances, element cycling between the crust and mantle, and may shed light on the features and processes which create earthquakes along convergent margins. The present award will support examination of the Chile margin, a region of intense erosion produced by the underthrusting of an active spreading center. Specifically, multi-channel seismic reflection data will be processed from an undisturbed section of the margin and compared to detailed analysis of data from a highly eroded section. Comparison of these data sets will provide a unique picture of temporal changes in margin structure and erosion.