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《Chinese Journal of Geophysics》 2015-02
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Inversion model of drainage basins′tectono-thermal evolution through detrital AFT ages:A case study of Chayu River in southeastern Tibet

SUN Dong-Xia;ZHONG Da-Lai;JI Jian-Qing;TU Ji-Yao;Institute of Geology and Geophysics,Chinese Academy of Sciences;Key Laboratory of Orogenic Belt and Crustal Evolution,School of Earth and Space Sciences,Peking University;  
Detrital thermochronology data is widely used in revealing the tectono-thermal evolution of drainage basins in orogen belts.Due to the impact of many factors,such as drainagetopographic features,the spatial distribution of erosion,the age-elevation relationship and so on,multiple solutions exist for the significance of detrital thermochronology data.Among such factors,the assumption of uniform spatial erosion maybe not rigorous.An inversion model was suggested to compute the tectono-thermal evolution of drainage basins using landform data and observed detrital thermochronology data.In this model,the distribution of altitudes is calculated using DEM data of drainage basins;slope angles are used to quantify spatial erosion rates for different altitudes;then different elevations′relative sand contribution ratios to detrital sample are determined.The detrital ages was acquired through apatite-fission-track(AFT)analysis.A variety of possible age-elevation relationships are randomly set,and the density distribution curve of detrital ages is calculated according to the settled relationships.Through the Chi-square test of observed and calculated age density distribution curve,the most probable age-elevation relationship is chosen which represents actual tectono-thermal evolution of drainage basin.The inversion model was used to investigate the evolution of drainage basins of Sangqu River and Gongrigabu River,which are two tributaries of Chayu River in southeastern Tibet.Two modern river sand samples from the catchments were analyzed by AFT method.The cooling ages of Sample CY from Sangqu River ranges from 5.8to 38.2Ma.The age range for another sample GR which from Gongrigabu River is 1.1~18.2Ma.Two age-elevation relationships derived from the catchments′inversion results show that tectono-thermal evolutions of two drainage basins are both divided into several phases. The different stage corresponds to different estimated exhumation rate.The drainage basin of Sangqu River was uniformly exhumed between 38and7 Ma,and the exhumation rate was about 0.14km/Ma;from 7Ma to present the basin was fast exhumed and the corresponding exhumation rate was about 1.62km/Ma.The drainage basin of Gongrigabu River was uniformly exhumed between 18 and 14 Ma,and the exhumation rate was about 0.32km/Ma;the basin was relatively stable afterward;since 8 Ma the exhumation rate increased to 0.21km/Ma during 8~5Ma,0.43km/Ma during 5~3Ma and 0.83km/Ma during3~1.1 Ma respectively.The observations of AFT ages across two tributaries of Chayu River lead to different tectono-thermal evolution of this area.First,the catchment of Gongrigabu River record younger cooling histories than Sangqu River.Second,the model result for Sangqu River is consistent with the exhumation rates previously reported in the same region through bedrock sample ages.It demonstrates that the inversion model in this paper can accurately uncover the tectono-thermal evolution represented by detrital thermochronology data.Therefore,in areas with high relief or covered with glaciers where bedrock samples are difficult to be obtained,detrital samples can be good substitute in revealing regional tectono-thermal evolution.
【Fund】: 国家自然科学基金项目(40472100 40872149 41302280 41472175)资助
【CateGory Index】: P597.3;P512.2
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