Regional Tectonic Evolution in Sunan Area and Control Effect to Seam Deposit

In Sunan Area, since the Caledonian tectonic movement, there were many tectonic activities occurred and the regional tectonic features were complicate d.Based on the systematic analysis on the regional geological information and the site actual investigation, taking the regional tectonic evolution as the main line, from t he dynamic and historical analysis, the paper had a detail discussion on the regional tectonic evolution features and the control effect to the seam deposit.The study res ults showed that the tectonic evolution in the study area would have the control effect to the coalfield obviously, mainly including the coalfield formation, seam distributi on, depth and coal quality.From the late Indo-Chinaperiod to the later Yanshan period, the complicated regional tectonic movement occurred in the region fundamentally changed the distribution pattern of the coal base in the study region.The different seam distribution in east and west was caused by the even subsidence and the prese nt coal base status finally formed.