中国东南六省元古代—侏罗纪构造演化

TECTONIC EVOLUTION OF PROTEROZOIC-JURASSIC IN SIX PROVINCES OF SOUTHEASTERN CHINA

Using the principle of combining historic analysis with mechanical analysis, the deformation characteristics, stress orientations and distributions of four main tectonic events from the Proterozoic to the Jurassic were discussed. In the Late Proterozoic (the Jinning event),a series of isoclinal folds were formed by compression of north-south orientation. In the Early Palaeozoic (the Caledonian event), a fold system obviously developed near east-west orientation compression. In the Triassic (the Indosinian event), the fold system and some granitic intrusions were widespread developed, which was earlier and stronger in the south than that in the north. In the Jurassic (the Yanshanian event), a series of NE-NNE trending thrusts and folds and remelted granites along the thrusts were formed, which was characterized by NWW-SEE trending compression. This is the fundamental setting stage of tectonic framework in the area.