板块俯冲对济阳坳陷形成的制约

为了研究地幔柱、西太平洋板块俯冲对济阳坳陷的影响,在前人提出的地幔柱观点的基础上,总结济阳坳陷的地质特征及关于地震震源分布与板块俯冲的研究成果,发现济阳坳陷的沉积地层、岩浆活动、构造拉张、地热梯度、密度流成因的储集砂体由南而北有规律地分布;俯冲板块进入地幔的过程实际上构成了地幔对流的下降流,地幔660km(或670km)深处是俯冲板块进入地幔后地幔物质调整所引发的上升流的深度;西太平洋板块向下俯冲时下插角度由南而北减小,俯冲板块到达地震不连续面的时间自南向北增大,使地幔柱由南向北迁移,导致济阳坳陷的地质、地球物理特征具有规律分布的特点.

Plate Subduction Contrains on the Formation of Jiyang Depression

In order to research the influence of mantle plume tectonics and plate subduction on the Jiyang depression,the geological characteristics of Jiyang depression and the results of the seismic source of earthquake and plate subduction are analyzed,based on the preview studies of the mantle plume.The result shows that the sedimentary stratum,the activities of magma,geological extension,the grads of terrestrial,and the reservoir sand are distributed regularly from south to north in Jiyang depression.The process of plate subducting into mantle formed the downwelling of mantle convection,the depth of 660 km(or 670 km) of the mantle is the depth of the upwelling which was adjusted by the matter of mantle after plate subducting into mantle.The downthrust angle of the subduction of western Pacific plate decreases from south to north,and the time of subducted plate reaching the discontinutity surface of earthquake increases from south to north,which resulted in the mantle plume transfer from south to north and regular distribution of the geology,geophysical characteristics from south to north in Jiyang depression.