西湖凹陷第三纪盆地演化及沉积特征

第三纪,西湖凹陷经历了弧后盆地、残余弧后盆地至前陆盆地的发展过程。不同盆地类型具有不同的构造格局和构造活动特征。不同的控相机制导致不同的盆地充填方式和沉积特征。本文从弧后扩张、扩张停止及岩浆弧造山作用应力机制出发,讨论了西湖凹陷盆地结构发展过程及其对沉积特征的控制作用。

Basmal Evolution and Sedimentary Characteristics in Tertiary Period ,Xihu Sag

Tertiary period,Xihu Sag had experienced basinal evolution from back-arc basin,relict of back - arc basin to foreland basin. Different types of depositional basin held different structure styles and underwent different tectonic acting. Diversity in facies - controlling machnism developing in certain depositional basin led to various basinfill process and litho-logic character. The paper discusses development of basin texture of Xihu Sag and environmental evolution under the setting of back -arc extension,thermal subsidence and magnatic arc orogenic movement in the viewpoint of tectonic strss machnism.