南黄海北部盆地张裂阶段演化特征

THE EVOLUTION CHARACTERISTIC IN THE NORTHERN BASIN OF SOUTH YELLOW SEA AT RIFTING STAGE

南黄海北部盆地张裂阶段经历4期拉张。同期半地堑具多种组合形式，它们控制沉积物分布，导致各凹陷具有不同沉降史，不同期半地堑的叠合反映盆地在时序上的演化特征，盆地拉张应力曾发生旋转，拉张速率从慢到快再到慢，阜宁期拉张作用最强烈，拉张方向近N－S向，是盆地的全面形成时期。

The Northern Basin of South Yellow Sea has four pulling arart periods at the rifting stage. There are many connection manners in the same half-graben period, which controlled sediment distribution and make each depression have distinct subsident history. The superpositions of dif ferent period of half-grabens depict the evolution characteristic of basin in space and time. The pulling arart force of Northern Basin had taken place rotation, and me pulling rate had changed from slow to fast and to slow. The pulling action in Funing period was the intensest, and the di rection was near X-S. It was a main forming period of the whole basin.