东海陆架盆地第三系沉积构造动力背景分析

TERTIARY BASIN SETTING ANALYSIS AND SEDIMENTARY DYNAMICS OF THE EAST CHINA SEA SHELF BASIN

东海陆架盆地属大陆边缘裂陷盆地，具有构造活动多期、反转构造明显和盆地动力背景复杂的特点。太平洋板块向欧亚板块的俯冲、深部地幔柱的活动是陆架盆地形成的主要动力；印度板块向欧亚大陆楔入造成的远程影响是导致构造应力场反转、触发和促进盆地裂陷作用的重要动力来源；盆地晚期自东向西的挤压力是第三位的构造力。根据可容纳空间的概念，从控制层序构型的影响因素，即海平面变化、构造沉降、沉积补给等方面讨论了东海陆架盆地第三系沉积构造动力背景。

The East China Sea shelf basin belongs to continental marginal rifting basin. It underwent several tectonic events and shows the characteristics of obvious inversions and complex geodynamic settings. It is the main dynamics that Pacific plate underthrusts beneath Eurasian plate and the activities of mantle plume between upper and lower mantle. The effect produced by which India plate thrust into Eurasian plate was the important dynamic source to result in the inversion of tectonic stress field and triggering and promoting basin rifting. The compressive force from east to west in the late period was the third tectonics stress. According to the concept of accommodation, the Tertiary sedimentary dynamic setting is discussed from the elements controlling the architecture of sequence, which are sea level changes, tectonic subsidence and sedimenary supply.