【摘要】 对中德合作“南海地球科学联合研究”和“中国边缘海的形成演化及重大资源的关键问题”的有关航次获得的地震资料进行层序地层和沉积相解释,并结合前人的研究成果,对南海中北部陆坡凹陷的构造和沉积特征进行了研究.研究结果表明,南海中北部陆坡区凹陷的构造演化经历了裂陷期、裂陷坳陷过渡期和坳陷期三个阶段,沉积环境经历了河流湖泊、浅海和深海的演化过程,不同演化阶段形成不同的地形形态.南海中北部地形演变可分为三个阶段,即早第三纪、早中新世-中中新世中期和中中新世中期—现在,其中早中新世中期-中中新世中期的沉积充填使陆坡形态发生了重要的转变,这次转变基本上奠定了现代意义上的陆架陆坡海盆的格局.更多还原

【Abstract】 The studies of tectonics and deposition of depression in the middle part of northern continental slope in the South China Sea were dealt with, based on the sequence stratigraphy and depositional facies interpretation of seismic profiles acquired by cruises of “China and Germany Joint Study on Marine Geosciences in the South China Sea” and “The formation, evolution and key issues of important resources in China marginal sea”, and combining with the previous studies in the study area. It is shown that the tectonic evolution of continental slope depressions can be divided into rifting, rifting-depression transitional and depression stages, while their depositional environments change from river to shallow marine and abyssal, which results in different topography in different stages. The topographic evolvement in the study area includes three stages, that is, Eogene, middle stage of early Miocene to middle Miocene and late Miocene to present, in which the infill of depressions during the second stage results in the crucial change of slope shape, and forms the present style of the slope.更多还原