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Book Chapter

Holocene Delta Evolution and Depositional Models of the Mekong River Delta, Southern Vietnam

By
Thi Kim Oanh Ta
Thi Kim Oanh Ta
Sub-Institute of Geography, Vietnamese Academy of Science and Technology, 1 Mac Dinh Chi St., 1 Dist., Ho Chi Minh City, Vietnam, e-mail: sedlap@hcm.vnn.vn
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Van Lap Nguyen
Van Lap Nguyen
Department of Geology, Faculty of Science, Niigata University, Niigata 905-2181, Japan
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Masaaki Tateishi
Masaaki Tateishi
IGG, Geological Survey of Japan, AIST, Tsukuba 305-8567, Japan
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Iwao Kobayashi
Iwao Kobayashi
IGG, Geological Survey of Japan, AIST, Tsukuba 305-8567, Japan
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Yoshiki Saito
Yoshiki Saito
IGG, Geological Survey of Japan, AIST, Tsukuba 305-8567, Japan
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Published:
January 01, 2005

Abstract:

The Mekong River Delta in southern Vietnam is a typical mixed tide- and wave-dominated delta with a wide delta plain formed during the last 6 to 8 ky. The late Pleistocene-Holocene sequence in this region since the last sea-level lowstand is composed of an incised- valley fill, comprising late Pleistocene to early Holocene fluvial to estuarine sediments, and Holocene deltaic sediments. The deltaic sediments are composed of early Holocene aggradational sediments and progradational sediments of middle to late Holocene age.

The progradational delta has evolved from a tide-dominated delta to the present mixed wave- and tide-dominated delta during the last 3 ky and shows a sudden regime shift of coastal environment. The tide-dominated delta was characterized by a well-developed mangrove forest on the subaerial delta plain, cross-shore sediment dispersal, and tide-influenced sedimentary facies. The tide- and wave-dominated delta exhibits a beach-ridge system in the subaerial delta plain, longshore sediment dispersal, and a steep delta-front topography, in which the sediments of the proximal river-mouth area are coarse-grained and those more distal are fine-grained.

As river-mouth coastal systems evolve from estuaries to deltas in response to sea-level changes, the formation of a tide-dominated delta marks the initiation of the highstand systems tract.

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Contents

SEPM Special Publication

River Deltas–Concepts, Models, and Examples

Liviu Giosan
Liviu Giosan
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Janok P. Bhattacharya
Janok P. Bhattacharya
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SEPM Society for Sedimentary Geology
Volume
83
ISBN electronic:
9781565762190
Publication date:
January 01, 2005

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