地质科学Issue(3)：743-762,20.
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
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.
摘要
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.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Key words
exhumation and erosion/ Paleo-topography/ The Fast Fourier Transform spectral analysis/ Tectonic geomorphology/ Closure temperature isotherm/ A critical wavelength of thermo-topography分类
天文与地球科学引用本文复制引用
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,(3):743-762,20.基金项目
国家重点基础研究计划“973”项目(编号:2011CB403106)、中国科学院知识创新工程项目(编号:KZCX2-YW12)、国家自然科学创新群体基金项目(编号:40721003)和国家自然科学基金(编号:40872131)资助. （编号:2011CB403106）
