中建南盆地新生代层序地层特征

中建南盆地是在晚白垩世末南海中南部的一次张性构造运动──礼乐运动作用下开始形成的。盆地的发育经历了中、晚始新世之间的西卫运动造成区域抬升,使中建南盆地的下伏地层遭受变形、隆升和剥蚀;晚渐新世─中中新世的南海中央海盆扩张──南海运动;中中新世末期的万安运动和中新世末期南海整体沉降作用。共划分了6个层序组,8个层序,即A层序组(含A层序)、B层序组(含B层序)、C层序组(含C1层序和C2层序)、D层序组(含D层序)、E层序组(含E1层序和E2层序)和F层序组(含F层序)。

SEQUENCE CHARACTERISTICS OF CENOZOIC STRATIGRAPHY IN ZHONGJIANNAN BASIN, SOUTH CHINA SEA

Zhongjiannan basin was formed in stretching tectonic movement, i.e., by the Liyue tectonic movement that occurred in the middle and south parts of South China Sea during late Cretaceous. The basin development had gone through regionally rising stage during middle to late Eocene when the underlying sequence was deformed and eroded. It is found that Nanhai tectonic movement occurred from late Oligocene to middle Miocene, Wan'an tectonic movement occurred at the end of middle Miocene, and regional subsidence in South China Sea occurred at the end of Miocene.In this study six sequence groups or eight sequences were divided: sequence group A contains sequence A, sequence group B contains sequence B, sequence group C contains sequence C1 and sequence C2, sequence group D contains sequence D, sequence group E contains sequence E1 and sequence E2, sequence group F contains sequence F.