Abstract
The Liyue Basin in southeastern South China Sea is considered to be a Cenozoic basin superimposed on the Mesozoic Erathem. The present account is based on comprehensive analysis of seismic profiles, dragnet and core samples. Cenozoic deposits in the basin are characterized by a sequence of marine detrital and carbonate rocks. There are two regional unconformities (T70 and T40), corresponding to the commencement and termination of sea-floor spreading in the South China Sea, in the Late Oligocene and late Early Miocene respectively. The Cenozoic sedimentary evolution of the basin recorded different sedimentary responses to sea-floor spreading in the South China Sea, and reflected differences in the basin structure, paleogeographic pattern and sedimentary characteristics before 30Ma (Late Oligocene) and after 30Ma. The evolution of sea-floor spreading, changes in sea level and sediment sources controlled the Cenozoic sedimentary infill.
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