COLLABORATIVE RESEARCH: Geodynamic Response to Extension in Convergent Orogens

合作研究：汇聚造山带伸展的地球动力学响应

• 批准号: 9909102
• 负责人: Jane Selverstone
• 金额: $ 3.87万
• 依托单位: University of New Mexico
• 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=9909102&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Geodynamic; Response; Extension

9909102SelverstoneOrogenic 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.

9909102 Selverstone在会聚板块边界的造山过程包括表层作用、可能的伸展构造和岩石的隆升和折返，以及整体的挤压构造背景。 这些进程如何相互作用，如何在大多数趋同的边际中分配，是一个问题。 该研究将调查一个发达的格状排水模式在阿尔卑斯山，这被认为是一个直接后果的伸展机制，与同收敛的延伸发生垂直的收敛方向，导致广泛折叠的脚墙和高角度脆性断层推测创建的脚墙通过滚动铰链。 差异侵蚀利用褶皱和高角度断层中的低点，导致观察到的网格图案。 该项目是一项地貌、岩相和结构研究，以测试格状排水模式起源的概念，这些数据将纳入构造/地貌模型。 结果应有助于在这个和其他建设背景下，岩石剥露构造延伸和河流侵蚀。