【摘要】 各种调查资料表明,东海自上新世晚期以来,新构造运动比较明显,主要表现形式有断裂、褶皱、地震、岩浆的侵入与喷发,海底热液活动以及区域构造的升降与岸线变迁等。新构造运动主要以升降作用为特征,升降具有振荡性与间断性。新构造运动的区域差异现象明显且在某些地区具有一定的继承性。同时,新构造活动还有明显的带状分布特征,它们大体上沿大陆边缘呈NE(或NEE)—NNE向分布,主要有2个带:东带沿冲绳海槽展布,西带沿东海陆架西部—沪、浙、闽、粤近海展布。在两个新构造活动带之间的东海陆架主体部位,是新构造活动的平静区。西带的新构造活动主要表现断裂与地震活动及区域升降作用;而东带的新构造活动远较西带强烈,不仅有大量的断裂与频繁的地震活动及地壳的升降运动,还出现很多褶皱构造,大规模的岩浆侵入与喷发以及海底热液活动。此一地区强烈的新构造运动表明,第四纪时期海槽的扩张作用还在加剧,它也是板块俯冲作用活跃的一种表现。更多还原

【Abstract】 Since late Pliocene,neotectonic movement in the East China Sea has been intensified,and the most obvious features of the neotectonic movement include faults,folds,magmatic intrusion and eruption,seafloor hydrothermal activities,and coastal changes,etc.The neotectonic movement is characteriged by vertical large-scale block-faulting,in an oscillating and episodic manner.Regional difference of neotectonic movement is apparent and shows continuity to cerlain extent in some areas.Meantime,the neotectonic movement occurs in NE(or NEE)～NNE direction along the continent margin,and includes two parts:the eastern belt along the Okinawa Trough and the western belt along the western border of the East China Sea shelf,which extends from—Shanghai,to Zhejiang,Fujian,and Guangdong offshore regions.A tranquil zone of neotectonic movement occurs between the two belts.Neotectonic movement is mainly characterized by faulting,seismic activities,and large-amplitude block-faulting in the western belt;but more intensified in the eastern belt.It includes not only faulting,frequently earthgualce activities,and large-amplitude block-faulting,but also folding,large-scale intrusion and eruption of magmatic rocks,and seafloor hydrothermal activities.Intensive neotectonic movement in the East China Sea owes its origin to the intensitied trough extension in Quaternary,as one of the features of the active subduction of the Pacitic plate.更多还原