| 频谱分析法在反演造山带地形高差演化中的应用——以中国大别山、米仓山和美国内华达山脉为例 |
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| 引用本文： | 苏哲,刘静,张鲁新,王二七.频谱分析法在反演造山带地形高差演化中的应用——以中国大别山、米仓山和美国内华达山脉为例[J].地质科学,2011,0(3):743-762. |
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| 作者姓名： | 苏哲 刘静 张鲁新 王二七 |
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| 作者单位： | 1.中国科学院地质与地球物理研究所,岩石圈演化国家重点实验室 北京 100029； 2.中国科学院研究生院,地球科学学院 北京 100049； 3.中国科学院青藏高原研究所,大陆碰撞与隆升国家重点实验室北京 100085； 4.中国科学院地质与地球物理研究所,地球深部研究国家重点实验室 北京 100029； 5.中国科学院地球环境研究所,黄土与第四纪地质国家重点实验室西安 710075 |
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| 基金项目： | 国家重点基础研究计划"973"项目，中国科学院知识创新工程项目，国家自然科学创新群体基金，国家自然科学基金 |
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| 摘 要： | 近年来迅速发展的低温热年代学已极大改善了人们对地壳内(1～6 km)隆升和剥蚀过程的认识.然而在实际工作中,样品的采集除了受到气候、地理环境等恶劣条件的制约以外,在对低温热年代学数据进行解释或以此计算造山带的隆升剥露速率时,使用的一些有关近地表热结构的假定条件通常是不科学的,如将易受地表起伏影响的地热等温线形态考虑成水...
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| 关 键 词： | 隆升与剥蚀 古地形 快速傅立叶变换频谱分析 构造地貌学 封闭温度等温线地形的临界波长 |
| 收稿时间： | 2011-04-10 |
Quantifying the late stage topographic evolution of orogenic belts by Fast Fourier Transform spectral analysis:Applications in the Dabie and Micang Shan, China and Sierra Nevada,U.S.A. |
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| Su Zhe,Liu Jing,Zhang Luxin,Wang Erchie.Quantifying the late stage topographic evolution of orogenic belts by Fast Fourier Transform spectral analysis:Applications in the Dabie and Micang Shan, China and Sierra Nevada,U.S.A.[J].Chinese Journal of Geology,2011,0(3):743-762. |
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| Authors: | Su Zhe Liu Jing Zhang Luxin Wang Erchie |
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| Abstract: | Recent advances in low temperature thermochronology and its applications have shed lights on the detailed processes in the shallowest crustal depth(1～6 km)，such as uplift，exhumation and cooling.However，in practice，much information is lost by imperfect sampling locations due to difficulties in geographic accessibility.In addition，assumptions of the unkown subsurface isotherms，which for instance are topographically dependent and thus can be non horizontal，bring more uncertainties in interpretations.This article introduces a method of the Fast Fourier Transform(FFT)spectral analysis which is produced by Braun(2002b)，combined with the fractual thought to take the elevation(h)and AHe age(a)of samples as the input(I) and output signals(F)，then make a transformation from the time domain to spatial one by the FFT.Through it，we could inverse the last stage of relief change of topography in the orogenic belt.Synthetically，this method considers the influence from the surface topographic fluctuation which could cause the isotherm to be curved.We succeed to apply the method into the Dabie Shan region and the Micang Shan Mt.in China and the Sierra Nevada range，the U.S.A.We find that in the Dabie Shan，the relief has decreased by～40％ ～50％（ β ≈-0.45）in the core since 35 Ma and reduced by～70％（ β≈-0.33）on the flank of the range since 50 Ma.In the Micang Shan，the relief keeps its relief stable（ β ≈-1）since 90 Ma； the Sierra Nevada range has experienced relief reduction by more than 50％ since～65 Ma. |
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| Keywords: | exhumation and erosion Paleo-topography The Fast Fourier Transform spectral analysis Tectonic geomorphology Closure temperature isotherm A critical wavelength of thermo-topography |
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