一、引言中国东部海域是全球板块构造体中的一个特殊区域,它的形成和发展及其内部各种地质现象与欧亚板块、太平洋板块、菲律宾板块间的相对运动和相互作用紧密相关。由于新生代以来板块间强烈的相互作用,造就了该区域丰富多样的构造单元,地壳-上地幔横向分布极不均匀。本文研究区域如图1中所示,在东经114°～145°, I. INTRODUCTION The sea area in eastern China is a special area in the global plate structure. Its formation and development as well as its various geological phenomena are closely related to the relative movement and interaction between the Eurasian plate, the Pacific plate and the Philippine plate. Due to the intense interaction between the plates since the Cenozoic, rich and diverse tectonic units have been created in the region. The crust-upper mantle is highly unevenly distributed horizontally. The research area in this paper is shown in Figure 1, with longitude 114 ° ~ 145 ° longitude,