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.

许多现代板块边界都涉及构造板块之间以高度倾斜角度的会聚。 这些斜向会聚系统产生压扭造山带，在这里，垂直于板块边界的缩短和平行于边界的剪切共同作用导致断层和岩石变形。 在压扭造山带中，岩石包裹体在靠近中央走滑断层带的地方通常表现出高度可变的压力-温度-时间路径。 该项目的重点是确定该地区的北方分支--考科带深部地壳岩石的变形和折返历史。5亿年前的达梅拉造山带。 Kaoko带是一个典型的压扭造山带，被深深侵蚀，因此可以在地表评估下地壳和中地壳的岩石变形过程和热历史。 Kaoko带的运动学和热历史提供了对发生在沿着现代压扭系统（如加州的圣安德烈亚斯断层和新西兰的阿尔卑斯断层）深度的构造过程的见解。