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The thermoluminescence of calcite in basalt from Ertan dam site is studied in this paper. The calcite is product of mesothermal action in late Permian. The deformation of the calcite crystals occurred during neofaulting. Experimental study indicates that the natural thermoluminescence of calcite declines under the action of pressure till exhaustion. On this basis, the age of the latest fault activity can be determined by the natural thermoluminescence accumulated since deformation of the calcite from Ertan dam site. By this method, it has been obtained that the deformation event of the calcite under pressure occurred between 1.403 and 1.155m.y. ago. Based on these results, it can be inferred that the active time of F-20 fault was not later than 1.155 m.y. ago. 相似文献