@article{EES, author = {Tran Nghi and Nguyen Dy and Doan Lam and Dinh Thanh and Nguyen Thai and Tran Nhan and Giap Chi and Nguyen Trang}, title = { Evolution of holocene depositional environments in the coastal area from the Tien river to the Hau river mouths}, journal = {VNU Journal of Science: Earth and Environmental Sciences}, volume = {26}, number = {4}, year = {2010}, keywords = {}, abstract = {Abstract. The Holocene coastal zone o f Mekong river plain is the result o f prolonged marinefluvial interaction. Lithofacies association in time and space IS characterized by three depositionalsystem ưact belonged to the upper part o f a sequence sưatigraphy. Based on lithology should bedivided 5 sedimentary types and 18 lithofacies distributed in stratigraphical colum n and in seabottom varying from 25m water depth to mainland coastal area. A ccording to sequencestratigraphy the ưansgressive systems tract at 5 Ky Bp, while from geochronology point o f viewthe boundary between Middle Holocene and Late H olocene is 3 Ky Bp - a regressive stage.During Early-Middle Holocene stage ưansgressive depositional system tract is characterized bytwo associated lilhofacies upward section: delta front swamp mud rich in organic materials faciesand marine shallow grey-greenish clay facies corresponded with marine flooding plain. And thenLate Holocene regressive phase corresponding with Highstand system s tract com posed o f deltaplain clayish Slit facies in which there are different sandy ndges generations distributed youngerseaward. Each sand ridge generation was mark by a coastal zone and associated lithofacies.In circumstance o f global climate change and sea-leve! rising, the M ekong river coastal zone willbe changed much more in framework o f modem tectonic subsidence. If the rate o f sea-level risingis 2mm/ycar then sea bed will be subsided with a rate o f 4mm/year. But recent rate o f sedimentaccumulation is over 4mm/year, so the modem coastline continue to prograde seaward with a rateo f 40m/year. The Mekong river mouths are migrating to East-North, and as a result geosystemsand landscapes arc changing.}, issn = {2588-1094}, url = {https://js.vnu.edu.vn/EES/article/view/1788} }