FORMING MECHANISM AND EVOLUTION OF THE SONGLIN DOME IN NORTHERN GUIZHOU PROVINCE

In order to study its forming mechanism and evolution of structural features, the stress field of Songlin dome in Northern Guizhou Province is analyzed with stage division and matching for the surveyed joints in each position of the dome. The result shows that the Songlin dome was formed from an early uplift on ancient basement. The historical tectonic movements caused to the complicated procedures of continuous uplifting→subsidence→uplifting. During Yanshanian movement, this area experienced two stages of stresses. The first was compression from southeast to northwest. The second was compressive stress between northwestward and southeastward. These stresses not only essentially strengthen and complicate the Songlin dome, but also impact and control the formation and development of regional structures.