Quaternary Changes in Sea-level in the South China Sea


Author : B. BiswasPublication : Bulletin of the Geological Society of MalaysiaVolume : 6Page : 228-256Year : 1973


Description

Bulletin of the Geological Society of Malaysia, Volume 6, Jul, 1973, pp. 228 – 256

 

Quaternary Changes in Sea-Level in the South China Sea

BUDDHADEB BISWAS

Esso Exploration Inc., 170, Grange Road, Singapore, 10

 

Abstract: The extensive shelf areas of the South China Sea provide an excellent area for the study of the Quaternary cycles of eustatic sea-level changes. As water depths do not exceed 200 meters and are less than 100 meters over large areas, relatively minor fluctuations of sea-level result in major lateral shifts in sedimentary facies.

Evidence from punch cores off the east coast of West Malaysia documents the Quaternary cycles of eustatic changes in sea-level and their extent. Lithologic changes combined with foraminiferal and spore-pollen data indicate shallowing of extensive areas of the South China Sea from middle neritic depths (50-100 meters) to mangrove swamps, fresh water marshes and coal swamps or even lateritised surfaces, and vice versa.

The youngest eustatic drop of sea-level occurred 11,000± years ago, coeval with the Latest Wisconsinian/Würm event. Two, or possibly three, older Pleistocene events of sea-level drop are observed.