| 利用低温热史恢复大别造山带晚白垩世以来的古高度 |
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| 引用本文： | 丁汝鑫,陈国能,周祖翼,许长海.利用低温热史恢复大别造山带晚白垩世以来的古高度[J].吉林大学学报(地球科学版),2012(Z1):247-253. |
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| 作者姓名： | 丁汝鑫 陈国能 周祖翼 许长海 |
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| 作者单位： | 中山大学地球科学系;广东省地质过程与矿产资源探查重点实验室;同济大学海洋地质国家重点实验室 |
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| 基金项目： | 国家自然科学基金项目(41102131);中山大学青年教师起步资助计划项目(32110-3181401);广东省自然科学基金重点项目(10251027501000019);中国博士后科学基金资助项目(20090450536) |
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| 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。
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| 关 键 词： | 低温年代学 大别造山带 古高度 地形 |
The Paleoelevation Reconstruction of Late Cretaceous Dabie Orogen by Low-Temperature Thermochronological Modelling Data |
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| Ding Ru-xin,Chen Guo-neng,Zhou Zu-yi,Xu Chang-hai.The Paleoelevation Reconstruction of Late Cretaceous Dabie Orogen by Low-Temperature Thermochronological Modelling Data[J].Journal of Jilin Unviersity:Earth Science Edition,2012(Z1):247-253. |
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| Authors: | Ding Ru-xin Chen Guo-neng Zhou Zu-yi Xu Chang-hai |
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| Institution: | 1.Department of Earth Science,Sun Yat-sen University,Guangzhou 510275,China 2.Guangdong Province Key Lab of Geological Process and Mineral Resource Investigation,Guangzhou 510275,China 3.State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China |
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| 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. |
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| Keywords: | low-temperature Chronology Dabie orogen paleoelevation topography |
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