COLLABORATIVE RESEARCH: Geomorphic and Geodynamic Response to Extension in Convergent Orogens

pazzaglia会聚板块边界的造山作用除了整体的挤压构造背景外，还包括表面作用、可能的伸展构造和隆升以及岩石的掘出。这些过程如何相互作用和分配在大多数收敛的边际是有问题的。该研究将调查阿尔卑斯地区发育良好的格状排水模式，该模式被认为是拉伸机制的直接结果，同辐合伸展发生在辐合方向的正方向，导致脚壁广泛折叠，脚壁可能通过滚动铰链形成高角度脆性断层。差异侵蚀利用了褶皱中的低点和高角度断层，从而形成了观察到的格状模式。该项目是一项地貌学、岩石学和构造研究，旨在测试格状水系起源的概念，这些数据将被纳入构造/地貌模型。研究结果将有助于在该构造环境和其他构造环境中，将岩石发掘归因于构造伸展和河流侵蚀。

9902828PazzagliaOrogenic processes at convergent plate boundaries involve surficial processes, possible extensional tectonics and uplift and exhumation of rocks in addition to the overall compressive tectonic setting. How these processes interact and are apportioned in most convergent margins is problematic. The research will investigate a well-developed trellis drainage pattern in the Alps that is thought to be a direct consequence of the extensional mechanism, with syn-convergent extension occurring normal to the convergent direction resulting in broadly folded foot walls and high angle brittle faults presumably created as the foot wall passes through a rolling hinge. Differential erosion exploits the lows in the folds and the high angle faults resulting in the observed trellis pattern. This project is a geomorphic, petrographic and structural study to test the concept of the origin of the trellis drainage pattern, and these data will be incorporated in a tectonic/geomorphic model. Results should help apportion rock exhumation to tectonic extension and fluvial erosion in this and other constructional setting.