【摘要】 造山带古高度的恢复对研究造山过程与古气候有重要意义。利用低温年代学热史数据恢复大别造山带晚白垩世以来的古高度。恢复流程包括将大别造山带低温热史模拟曲线数字化,提取时间温度数据,通过空间插值方法计算研究区域平均剥露厚度,再通过挠曲均衡校正,计算平均古高度变化量,最后通过2维积分计算古地形波幅降低量。结果显示:90 Ma至今,大别造山带平均剥露厚度达约5.44 km,而古地形平均高度降低2.86～4.16 km,古地形波幅降低的上限为4.49～6.53 km。更多还原

【Abstract】 The paleoelevation reconstruction of an orogen is of great significance to the study of mountain building and of paleoclimate.The authors use the thermal history data of low-temperature thermochronology to reconstruct the paleoelevation of the Dabie orogen since Late Cretaceous.The reconstruction procedure includes(in order) the following: digitalizing the low-temperature thermal history modelling curve of the Dabie orogen,extracting the time-temperature data,calculating the average exhumation thickness of the focused region by the spatial interpolation method,the deflection isostatic correction,the calculation of the average paleoelevation change,and the two-dimensional integral calculation to get the amplitude decrease of paleotogography.The result shows that the average exhumation thickness of the Dabie orogen since 90 Ma is about 5.44 km,and the average elevation decrease of paleotogography is 2.86-4.16 km,the upper limit of the amplitude decrease of paleotogography is 4.49-6.53 km.更多还原