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

合作研究：汇聚造山带伸展的地貌和地球动力学响应

• 批准号: 9902828
• 负责人: Frank Pazzaglia
• 金额: $ 4.62万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-07-01 至 2002-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9902828&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Geomorphic; Geodynamic; Response

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.

9902828Pazzaglia 汇聚板块边界的造山过程除了整体的压缩构造环境外还涉及地表过程、可能的伸展构造以及岩石的隆起和折返。 这些过程如何相互作用并在大多数收敛边缘中分配是有问题的。 该研究将调查阿尔卑斯山发育良好的格子排水模式，该模式被认为是伸展机制的直接结果，同步聚合伸展发生在垂直于聚合方向的方向上，可能导致广泛折叠的下壁和高角度脆性断层当底墙穿过滚动铰链时创建。 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网格图案。 该项目是一项地貌、岩石学和结构研究，旨在测试网格排水模式起源的概念，这些数据将纳入构造/地貌模型中。 结果应有助于将岩石折返分配到该构造环境和其他构造环境中的构造延伸和河流侵蚀。