TAILIEUCHUNG - Báo cáo "Evolution of holocene depositional environments in the coastal area from the Tien river to the Hau river mouths "

The Holocene coastal zone of Mekong river plain is the result of prolonged marinefluvial interaction. Lithofacies association in time and space is characterized by three depositional system tract belonged to the upper part of a sequence stratigraphy. Based on lithology should be divided 5 sedimentary types and 18 lithofacies distributed in stratigraphical column and in sea bottom varying from 25m water depth to mainland coastal area. According to | VNU Journal of Science Earth Sciences 26 2010 185-201 Evolution of holocene depositional environments in the coastal area from the Tien river to the Hau river mouths Tran Nghi1 Nguyen Dich Dy2 Doan Dinh Lam2 Dinh Xuan Thanh1 Nguyen Dinh Thai1 Tran Thi Thanh Nhan1 Giap Thi Kim Chi1 Nguyen Thi Huyen Trang1 Hanoi University of Science VNU 334 Nguyen Trai Hanoi Vietnam Vietnamese Academy of Science and Technology 18 Hoang Quoc Viet Hanoi Vietnam Received 3 December 2010 received in revised form 17 December 2010 Abstract. The Holocene coastal zone of Mekong river plain is the result of prolonged marine-fluvial interaction. Lithofacies association in time and space is characterized by three depositional system tract belonged to the upper part of a sequence stratigraphy. Based on lithology should be divided 5 sedimentary types and 18 lithofacies distributed in stratigraphical column and in sea bottom varying from 25m water depth to mainland coastal area. According to sequence stratigraphy the transgressive systems tract at 5 Ky Bp while from geochronology point of view the boundary between Middle Holocene and Late Holocene is 3 Ky Bp - a regressive stage. During Early-Middle Holocene stage transgressive depositional system tract is characterized by two associated lithofacies upward section delta front swamp mud rich in organic materials facies and marine shallow grey-greenish clay facies corresponded with marine flooding plain. And then Late Holocene regressive phase corresponding with Highstand systems tract composed of delta plain clayish silt facies in which there are different sandy ridges generations distributed younger seaward. Each sand ridge generation was mark by a coastal zone and associated lithofacies. In circumstance of global climate change and sea-level rising the Mekong river coastal zone will be changed much more in framework of modern tectonic subsidence. If the rate of sea-level rising is 2mm year then sea bed will be subsided with a rate of 4mm year. .

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