新生代南海北部碳酸盐岩台地的淹没事件研究

碳酸盐岩台地广泛发育及其淹没事件是南海新生代地层的重要特征之一。通过钻孔揭示的地层，古生物等资料对位于南海北部的东沙和西沙碳酸盐岩石地发育，演化及其淹没层序进行了分析，首次提出了本区自新生代以来经历了三次大的淹没和若干次小的淹没事件，分别相当于Haq提出的三级和四级层序。

Drowning Event Research: Insights from Cenozoic Carbonate Platforms in Northern South China Sea

Development of Cenozoic carbonate platforms is one of the most spectacular stratigraphic features in the South China Sea.The purpose of this study is to analyze the evolution history of Dongsha and Xisha,the two carbonate platforms,and possible mechanism for drowning events.Since Tertiary,the global eustatic level has kept falling while trangression in the South China Sea remained expanding,indicating that local sea-floor spreading and subsidence acted as a leading role in the study area.Cenozoic carbonate platform in the study area is the unique carrier containing information of marine basin evolution;while drowning events of the platforms is the direct indication of seabed spreading.Therefore,the drowning events of carbonate platforms can reveal the history of marine basin spreading and environmental vicissitudes.In this paper,for the first time,three major and several minor drowning events of the platforms since Tertiary have been identified,corresponding to the third and fourth order global eustatic cycles raised by B.U.Haq.