Late Pleistocene - Holocene seismic stratigraphy of Nha Trang Shelf, Central Vietnam
Abstract
The late Pleistocene - Holocene stratigraphic architecture on the steep and narrow shelf off Nha Trang, Central Vietnam has been explored by high resolution seismic profiles integrated with sediment core data. Sequence stratigraphic results reveal five major seismic units and three bounding surfaces which are composed of two distinctive sequences. Those sequences are bounded by two regional unconformities (SB1, SB2) which have been formed in respond to different sea-level regimes during Marine Isotope Stage (MIS) 5e to the Last Glacial Maximum (LGM) period. The revealed relict beach-ridge deposits at a water depth of about ~ 130m below the present water depth indicate that the LGM sea-level in this area was lower than in neighboring areas and probably resulted from subsidence due to a high sedimentation rate and/or neotectonic movements of the East Vietnam Fault System.
The late Pleistocene - Holocene high amplitude of sea-level change during a long fourth-order and superimposed by shorter fifth-order cycle is the principal factor in reorganizing the formation of the Nha Trang continental Shelf sequence. Other local controlling factors such as fluctuations in sediment supply, morphological variations of the LGM surface, subsidence rate and hydrodynamic conditions provided the distinctive features of the Nha Trang Shelf sequence stratigraphic model in comparison to neighboring areas.
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