THE MESOZOIC FORELAND BASINS IN THE LOWER YANGTZE AREA

Based on seismic sections,wells and surface surveys,the authors concluded that there exist opposite thrusting peripheral foreland basin in the middle and a single thrusting foreland basin in the south of the Lower Yangtze area in the Middle Mesozoic era(about 240～157Ma).The peripheral foreland basin is the product of A-type subduction resulted from the collision between the Lower Yangtze plate and the North China plate about 240～157Ma.The thrusting structures showed that thrust was from northwest to southeast and from southeast to northwest and the Mid-Upper Triassic and Mid-Lower Jurassic were deposited in the thrusting syncline cores;The south foreland basin is only the front part of South China basins which were resulted from the nappes thrusting from southeast to northwest and the Upper Triassic was depositted in the front of the nappes about 240～157Ma.The thrusting cores of the peripheral foreland basin is the most favourable area for seeking oil and gas traps of marine Meso-Paleozoic group.