Inversion Model of Drainage Basins' Tectono-Thermal Evolution Through Detrital AFT Ages: Case Studies of Rivers in Southeastern Tibet

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, multiple solutions exist for the significance of detrital thermochronology data. This finding suggests a simulation model which computes the tectono-thermal evolution of drainage basins using landform data and observed detrital thermochronology data, and then established AFT detrital mineral low-thermochronology method to reveal exhumation history of catchments. Slope angles are used to quantify spatial erosion rates; the data of elevation was fully used and calculated the corresponding thermal ages, which were given clear geological significance. The method is successfully applied to simulate the exhumation history of the whole catchment area and validated by the bedrock samples systematically. This model was used to study the drainage basins of Sangqu river and Gongrigabu river, which belongs to the tributary of Chayu River, and several sections along Nujiang River in southeastern Tibet.The results revealed the leading role of climate factors in the geomorphic and tectonic evolutions in southeastern Tibet.