Kinematics and Timing of Tectonic Exhumation along the Huwan and Taihu Detachments: Northern and Southern Boundaries of the Dabie/Tonghai Shan Ultra-High Pressure Terrain

沿湖湾支流和太湖支流的构造折返运动学和时限：大别山/通海山超高压地形的南北边界

• 批准号: 9805337
• 负责人: David Rowley
• 金额: $ 24万
• 依托单位: University of Chicago
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-08-01 至 2002-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9805337&HistoricalAwards=false
• 关键词: Kinematics; Timing; Tectonic; Exhumation; along

9805337 Rowley The presence of coesite-and diamond-bearing assemblages in eclogites from an increasing number of orogenic belts suggests that the exhumation of ultra-high pressure (burial depths 90-120 km) rocks is not a unique event in the geologic record. However, the mechanisms and the time scale over which such exhumation takes place remain incompletely characterized. This project is aimed at improving the understanding of the kinematics and timescales for exhumation of the Dabie/Tonghai ultra high pressure assemblages, which may involve large scale extensional tectonics. Two recently discovered very large displacement candidate normal faults will be examined for displacement same, offset and age of movement. Results will be compared to timing of ultrahigh metamorphism to test several hypotheses about uplift and exhumation mechanism in orogens.

9805337罗利 越来越多的造山带榴辉岩中含有柯石英和金刚石组合，这表明超高压（埋深90-120公里）岩石的折返并不是地质记录中唯一的事件。 然而，挖掘遗骸的机制和时间尺度仍然没有完全确定。 该项目旨在提高对大别/通海超高压组合折返的运动学和时间尺度的认识，这可能涉及大规模的伸展构造。 对新近发现的两条大位移候选正断层进行了位移量、错距和运动年龄的检验。 将结果与造山带变质作用的时间进行比较，以检验关于造山带隆升和折返机制的几个假设。