长江下游中生代岩浆活动与中新生代盆地

Mesozoic Magmatic Activity and Middle-Cenozoic Basins of the Lower Reaches of Yangtze River

中生代期间，强烈的构造和岩浆活动改变了长江下游地区古生代以来的台地沉积体制和区域钩造格局的发展。在大量岩浆侵入和喷出之后，产生了一系列岩浆期后的陆相盆地。这些盆地的形成和发展是岩浆期后地壳均衡补偿作用的结果，盆地的形成和演化历史与岩浆活动存在着密切的联系。

The Lower reaches of Yangtze river is an imPOrtant area of Mesozoic magmatic activity wbere the magmatic activity ended to couple with the formation or large numbers of middle Cenozoic basins. There are differences between the structures or deep earth crust or/and depression in these basins and their surrounding distribution area. The differences reflect the basins differ in deep geologic setting of genesis from magmatic activity,and the existence of strict chronometric correlation in both formations of basins and magmatic activity. The overall depressiou volume within the middle Cenozoic basins is about 927, 100 km3,representing basically the volume reduced by crustal pull-apart at that time. The surrounding Mesozoic magmatic rocks of basins occupy volume of 950, 750km3 in earth's surface,representing gushing amount from mantle material at that time. The subsided amount of basins and gushing amount of magmatic rock are equal in data,reflecting the genetic and structural complementation existed among the migration and pull-apart,thickness reduction and subsided amount.