东海陆架盆地瓯江凹陷晚白垩世-渐新世构造变形特征及动力学机制

项目名称： 东海陆架盆地瓯江凹陷晚白垩世-渐新世构造变形特征及动力学机制

项目编号： No.41506080

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 天文学、地球科学

项目作者： 杨传胜

作者单位： 青岛海洋地质研究所

项目金额： 21万元

中文摘要： 东海陆架盆地构造变形记录了洋－陆相互作用的重要信息，是认识华南东部构造演化过程、机制及太平洋板块俯冲等的关键，先后受控于太平洋构造体系和特提斯构造体系；晚白垩世-渐新世是安第斯型陆缘向日本型陆缘性质转换的重要时期。瓯江凹陷是东海陆架盆地的一个重要凹陷，中、新生界发育，完整地记录了东海陆架盆地构造变形信息。本课题拟以瓯江凹陷晚白垩世-渐新世各阶段构造变形特征为研究对象，应用地震剖面开展精细构造解析、重要界面揭示、重磁对应分析、平衡剖面制作、构造应力场模拟等手段恢复该区的构造变形过程，重点解剖区域内多期构造运动下瓯江凹陷的形成演化过程，并结合数值模拟揭示其动力学机制，探讨周缘板块与该凹陷之间盆内外构造变形的耦合关系。本课题不仅对恢复东亚陆缘断陷盆地群成盆动力学机制、认识陆缘属性、中新生代盆地性质、陆缘转换具有重要理论价值，而且还能够为东海海域油气勘探提供科学依据。

中文关键词： 东海陆架盆地；瓯江凹陷；晚白垩世-渐新世；构造变形；动力学机制

英文摘要： Deformation of the East China Sea Shelf Basin, which is successively controlled by Pacific tectonic domain and Tethyan tectonic domain, records the interaction of ocean and continent, and is the key to understand the tectonic evolution of the eastern South China, subduction of the Pacific Ocean Plate and so on. Meanwhile, Late Cretaceous-Oligocene is an important continental margin transition period from Andeans-type continental margin to Japanese-type continental margin. Oujiang Sag, in which the Meso-Cenozoic strata are well developed, is an important sag of the East China Sea Shelf Basin, and completely records the deformation of the basin. This study, aiming at the deformation of the Oujiang Sag from Late Cretaceous to Oligocene, will restore the deformation in the research area using structural analysis, gravity and magnetic analysis, balanced cross section technique, simulation of structural stress and some other methods. Based on the works and methods described above, dynamic mechanism of the Oujiang Sag will be revealed combining numerical simulation, and interconnection of deformation in the sag and its related plates will also be discussed. This study is not only helpful to understand dynamic mechanism of rift basins in eastern Asia, property of continental margin, type of the Mesozoic basin and transition of margin type, but also provides scientific evidence for petroleum exploration in the East China Sea.

英文关键词： East China Sea Shelf Basin;Oujiang Sag;Late Cretaceous-Oligocene ;deformation;dynamic mechanism