Tectono-Thermal Evolution and Exhumation in Transpressional Orogens: the Deep Crust of the Damara Orogen

压折造山带的构造热演化和折返：达马拉造山带的深部地壳

• 批准号: 0440188
• 负责人: David Foster
• 金额: --
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0440188&HistoricalAwards=false
• 关键词: Tectono; Thermal; Evolution; Exhumation; Transpressional

Many modern plate boundaries involve convergence between the tectonic plates at highly oblique angles. These obliquely convergent systems produce transpressional orogenic belts where faulting and rock deformation occurs by a combination of shortening perpendicular to the plate boundary and shear parallel to the boundary. In transpressional orogens, rock packages typically show highly variable pressure-temperature-time paths adjacent to a central strike-slip fault zone. This project is focused on the determining the deformation and exhumation histories of deep crustal rocks in the Kaoko zone, which is the northern branch of the ca. 500 million year old Damera Orogen in Nambia. The Kaoko zone is a classic transpressional orogen that is deeply eroded so that the rock deformation processes and thermal histories of the lower and middle crust can be assessed at the surface. The kinematic and thermal history of the Kaoko zone gives insights into the tectonic processes occurring at depth along modern transpressional systems like the San Andreas Fault, California and the Alpine Fault in New Zealand.

许多现代板块边界涉及高度倾斜角度的构造板之间的收敛。 这些倾斜的收敛系统会产生转骨造山带，在这种造口皮带中，断层和岩石变形是通过垂直于板边界的缩短和平行于边界的剪切的组合而发生的。 在转载牛根中，岩石包装通常显示出与中央滑坡断层区相邻的高度变化压力温度路径。 该项目的重点是确定Kaoko区域深层地壳岩石的变形和挖掘历史，该岩石是CA的北部分支。南比亚有5亿年历史的Damera egeroto。 Kaoko区是一种经典的转骨造山基因，深处侵蚀，因此可以在表面评估岩石变形过程和下层外壳的热历史。 Kaoko区的运动学和热历史可深入了解沿现代化的转运系统在深度发生的构造过程，例如San Andreas断层，加利福尼亚州和新西兰的Alpine断层。