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东海陆架盆地位于欧亚板块的东南缘和西太平洋活动大陆边缘,本文选取了东海陆架盆地主要凹陷的17条地震剖面,采用平衡剖面技术,计算了主要凹陷新生代不同演化阶段的伸展率和压缩率。分析表明,东海陆架盆地构造演化总体由西向东跃迁。晚白垩世至晚古新世东海陆架盆地裂陷中心在西部坳陷带,始新世东迁至东部坳陷带,上新世东迁至东海陆架盆地东侧的冲绳海槽盆地。古新世中后期东海陆架盆地西部坳陷带北侧昆山凹陷反转;中新世东部坳陷带的西湖凹陷反转。东海陆架盆地西部坳陷带与东部坳陷带构造演化不同,证明了东海陆架盆地的东西分带。西部坳陷带北部的长江坳陷和南部的台北坳陷构造演化不同,东部坳陷带北部的西湖凹陷和南部的钓北凹陷构造演化不同,证明了东海陆架盆地的南北分块。
The East China Sea shelf basin is located on the southeastern margin of the Eurasian plate and on the active continental margin of the western Pacific. In this paper, 17 seismic sections of the main depression of the East China Sea Shelf Basin were selected. By using the balanced section technique, the rate of extension and compression of the Cenozoic evolutionary stages rate. The analysis shows that the tectonic evolution of the East China Sea shelf basin changes from west to east in general. From the Late Cretaceous to the Late Paleocene, the fissure center of the East China Sea Shelf Basin was in the western depression zone, migrated from Eocene to East Depression, and moved eastward to the Okinawa Trough basin on the east side of the East China Sea shelf basin. In the middle and late Paleocene, the Kunshan Sag on the north side of the western Depression Belt of the East China Sea Shelf Basin is reversed; the West Lake depression of the belt in the eastern Miocene is inverted. The structural evolution of the western depression in the East China Sea Shelf Basin is different from that in the eastern depression, which proves the east-west zoning of the East China Sea continental shelf. The structural evolution of the Changjiang depression in the north of the western depression belt and that of the southern Taipei depression are different. The structural evolution of the Xihu depression in the north of the eastern depression zone and the Diaian depression in the south is different, which proves the north-south block of the East China Sea continental shelf.