2006 Fiscal Year Final Research Report Summary
Initiation of the Mekong River Delta and paleo-environments of lowlands in Cambodia during the Holocene
| Project/Area Number |
17403010
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | National Institute of Advanced Industrial Science and Technology |
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Principal Investigator |
SAITO Yoshiki National Institute of Advanced Industrial Science and Technology, Institute of Geology and Geoinformation, Group Leader, 地質情報研究部門, 研究グループ長 (00357071)
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| Project Period (FY) |
2005 – 2006
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| Keywords | Mekong River / Southeast Asia / Delta / Holocene / Sea-level change / Paleoenvironment / human activity / mangrove |
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| Research Abstract |
Drilling survey at three sites and seismic survey in the Mekong River in Cambodia were conducted to clarify the initiation of the Mekong River Delta and paleo-environments of lowlands in Cambodia during the Holocene. Quaternary strata in the lowlands consists of at least two marine successions: Holocene and late Pleistocene sediments, bounded by an unconformity. Holocene sediments consist of fluvial sediment, tidal-fluvial sediment, and intertidal to subtidal flat sediment. PSG core located near the border of Vietnam contains marine sediments deposited at inter-to sub-tidal flat environment with ages of 8000-8300 cal BP, meaning that the shoreline was located more landward in Cambodia at that time. This marine inundation was occurred by a rapid sea-level rise during 8500-8400 cal BP abruptly, which will be correlated with 8.4-8.5 ka meltwater pulse. Just after the inundation, the Mekong River Delta was initiated at about 8.3 ka and has prograded with aggradational accumulation of 5m-thick peaty sediments distributed widely around Phnom Penh. Tide-dominated environment was changed into more fluvial dominated environment since 6.7 ka to the present with influences of human activities for the last 2 ka.
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[Journal Article] Depositional facies and radiocarbon ages of a drill core from the Mekong River lowland near Phnom Penh, Cambodia : evidence for tidal sedimentation at the time of Holocene maximum flooding.2007
Author(s)
Tamura T, Saito Y, Sieng, S, Ben, B, Kong, M, Choup, S, Tsukawaki, S.
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Journal Title
Journal of Asian Earth Sciences vol. 29, nos. 5-6
Pages: 585-592
Description
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[Journal Article] Landscape variability and the response of Asian megadeltas to environmental change.2006
Author(s)
Woodroffe, C.D, Nicholls, R.J, Saito, Y, Chen, Z, Goodbred, S.L.
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Journal Title
Global Change and Integrated Coastal Management : the Asia-Pacific Region. Coastal Systems and Continental Margins(In Harvey, N. (ed.))(Springer) Vol.10.
Pages: 277-314
Description
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[Journal Article] Holocene evolution of the Mekong river delta, Vietnam2005
Author(s)
Nguyen, V.L, Ta, T.K.O, Tateishi, M, Kobayashi, I, Saito, Y.
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Journal Title
J. Geol. Soc. Japan vol. 111, no. 11
Pages: XXI
Description
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[Journal Article] Holocene delta evolution and depositional models of the Mekong river delta, southern Vietnam2005
Author(s)
Ta, T.K.O, Nguyen, V.L, Tateishi, M, Kobayashi, I, Saito, Y.
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Journal Title
River Deltas-Concepts, Models, and Examples (In L. Giosan and J.P. Bhattacharya, eds.)(SEPM Spec. Publ) no. 83
Pages: 453-466
Description
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