Abstract
Apatite was separated from fault-clay, fracture-cliff rock and fracture wall rock, which were collected from Huangkou fracture north to Xiannu Mountain lying 20 km southwest to Three Gorges Dam Project-Sandouping dam. The fission tract characters and their length variations of apatite show that Xiannu Mountain fracture belt was formed at (0.7±0.04)Ma, but its wall rock at (25.31±2.8) Ma. This result and previous studies show that no activity has happened since the Holocene, and the Three Gorges Dam Project is not affected by activity of the Xiannu Mountain fracture belt.
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