溢流玄武岩在海盆内分布广泛,本文运用近三年来采集的高分辨率地震剖面数据,对南海海盆北部玄武岩溢流相的内部结构进行了识别,认为玄武岩溢流相主要发育于下中新统、上中新统和上新统地层内,地震相主要表现为滩状强振幅地震相、丘状变振幅地震相、丘状中-低连续地震相和龟背状地震相四种类型;形成时期推测为早中新世、晚中新世及上新世-第四纪时期,揭示出在南海扩张期间及停止扩张后,海盆都有溢流玄武岩发育;形成方式主要为裂隙式喷发、中心式喷发和浅层侵入三种。 Overflow basalts are widely distributed in the basin. Based on the high-resolution seismic section data collected in the past three years, the internal structure of the basaltic overflow phase in the northern South China Sea Basin is identified. The basaltic overflow mainly occurs in the Lower Miocene , The Upper Miocene and the Upper Pleistocene strata, the seism facies mainly include four types of beach-like strong amplitude seismic phase, mound seismic amplitude phase, mound medium-low continuous seismic phase and turtle-like seismic phase. The period is presumed to be Early Miocene, Late Miocene and Pliocene-Quaternary Period, revealing that during the expansion of the South China Sea and after its expansion ceased, the basins developed overrun by overflowing basalts. The formation modes were mainly fissure eruptions, center Eruption and shallow invasion of three.