首页|Latest Pleistocene to Holocene stratigraphic record and evolution of the Paleo-Mekong incised valley, Vietnam

Latest Pleistocene to Holocene stratigraphic record and evolution of the Paleo-Mekong incised valley, Vietnam

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  • NSTL
  • Elsevier
Recent 200+ km progradation of the Mekong River delta over the last 6000 years has provided a sequence of incised-valley fills with insights into the sedimentary response of a large river system to sea-level changes since the Last Glacial Maximum (LGM). This study provides an analysis of comprehensive synthesis of the incised-valley and successive progradational deposits of the paleo-Mekong River across a regional area spanning from the Cambodian lowland to the Vietnamese shelf. The study is based on the analysis of the depositional facies, diatom and foraminiferal assemblages, and radiocarbon ages of three new cores and previously published cores. The depositional succession observed in these cores is divided into the lower and upper units representing Pleistocene weathered sediment and incised valley fills and delta sediment since the LGM, respectively. The upper unit shows an upward-deepening succession from the fluvial channel to estuary and subtidal deposits, followed by an upward-shallowing succession consisting of progradational deltaic deposits. This unit can be divided into four phases: the fluvial channel sedimentation (before similar to 13.4 ka); retrogradational and aggradational estuarine system (similar to 13 to ca. 8 ka), aggradational and progradational delta system (ca. 8 to 6 ka), progradational delta system (6 ka to present). Tides were dominant from 13 to similar to 3.5 ka, followed by wave- and tide-dominated environments until present at its river-mouth and coast.

Incised valleyMekong RiverDeltaSedimentary faciesHolocene Sea level change

Thi Kim Oanh Ta、Van Lap Nguyen、Saito, Yoshiki、Gugliotta, Marcello、Tamura, Toru、Thi Mong Lan Nguyen、Minh Hoang Truong、Thi Luan Bui

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VAST, HCMC Inst Resources Geog, 01 Mac Dinh Chi Str,Dist 1, Ho Chi Minh City, Vietnam

Shimane Univ, Estuary Res Ctr, 1060 Nishikawatsu Cho, Matsue, Shimane 6908504, Japan

AIST, Geol Survey Japan, Cent 7, Higashi 1-1-1, Tsukuba, Ibaraki 3058567, Japan

Ho Chi Minh Univ Sci, 227 Nguyen Van Cu Str,Dist 5, Ho Chi Minh City, Vietnam

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2021

10.1016/j.margeo.2020.106406

Marine Geology

Marine Geology

EISCI
ISSN：0025-3227
年,卷(期)：2021.433
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