The Late Quaternary Evolution of the Southern Vietnamese Continental Shelf
The late Pleistocene-Holocene sedimentary architecture on two different geological setting areas on the Southern Vietnam Shelf has been investigated on the basis of shallow seismic data, sediment core data, sequence stratigraphic concepts and numerical modeling. The late Pleistocene-Holocene sequence stratigraphic models of the SE Vietnam and Nha Trang Shelf show distinctive features which result from the differences in sediment supply regime, shelf morphology and hydrodynamic conditions between the two areas. Sedimentation on the Nha Trang Shelf from the end of the LGM to present has been investigated on the basis of process-based numerical modeling simulations. The results indicate that the sediment supply during TST period (19.6-8.0 ky BP) is 3 to 4 times higher than that of HST period (8.0-0 ky BP). During HST and TST period, 50-80 % of total supplied sediment was contributed by three local river basins (Cai, Dinh and Van Phong) and the rest was transported alongshore from the north.