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Sedimentology of Late Holocene fluvial levee and point-bar deposits from the Cambodian tract of the Mekong River

View ORCID ProfileMarcello Gugliotta, Yoshiki Saito, Bunnarin Ben, Sotham Sieng and Thomas S. N. Oliver
Journal of the Geological Society, 175, 176-186, 30 August 2017, https://doi.org/10.1144/jgs2017-047
Marcello Gugliotta
1Geological Survey of Japan, AIST, Central 7, Higashi 1-1-1, Tsukuba, 305-8567, Japan
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Yoshiki Saito
1Geological Survey of Japan, AIST, Central 7, Higashi 1-1-1, Tsukuba, 305-8567, Japan
2Estuary Research Center, Shimane University, 1060 Nishikawatsu-cho, Matsue, 690-8504, Japan
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Bunnarin Ben
3Department of Geology, GDMR, MIME, Phnom Penh, Cambodia
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Sotham Sieng
3Department of Geology, GDMR, MIME, Phnom Penh, Cambodia
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Thomas S. N. Oliver
4School of Earth & Environmental Science, University of Wollongong, NSW 2522, Australia
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Abstract

The study of channel margin deposits is crucial to better understand fluvial systems and has significant social and economic implications. This paper describes sedimentological features of Late Holocene levee and point-bar deposits from five excellent outcrop exposures along the Cambodian tract of the Mekong River. Point-bar deposits show a typical fining-upward trend with low-angle inclined bedding and consist of gravelly sand, sand and mud beds. Levee deposits show a typical coarsening-upward or no clear vertical grain-size trend and consist of mud and very fine sand beds. Channel margin deposits formed in the outer river bend show a simple levee element, whereas inner bend deposits show more complex architecture with combinations of point-bar and levee elements. Water-level fluctuations play a fundamental role in the construction of point-bar and levee architecture; the resulting deposits show evidence of strong river currents with rapid sedimentation alternating with evidence of subaerial exposure with no sedimentation. This combination of sedimentary features can also form in other environments, but is distinctive of channel margin deposits forming in climates with a pronounced seasonality, including large and perennial rivers in tropical savannah climate areas.

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Journal of the Geological Society: 175 (1)
Journal of the Geological Society
Volume 175, Issue 1
January 2018
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Sedimentology of Late Holocene fluvial levee and point-bar deposits from the Cambodian tract of the Mekong River

Marcello Gugliotta, Yoshiki Saito, Bunnarin Ben, Sotham Sieng and Thomas S. N. Oliver
Journal of the Geological Society, 175, 176-186, 30 August 2017, https://doi.org/10.1144/jgs2017-047
Marcello Gugliotta
1Geological Survey of Japan, AIST, Central 7, Higashi 1-1-1, Tsukuba, 305-8567, Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Marcello Gugliotta
  • For correspondence: m.gugliotta.geo@gmail.com
Yoshiki Saito
1Geological Survey of Japan, AIST, Central 7, Higashi 1-1-1, Tsukuba, 305-8567, Japan
2Estuary Research Center, Shimane University, 1060 Nishikawatsu-cho, Matsue, 690-8504, Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Bunnarin Ben
3Department of Geology, GDMR, MIME, Phnom Penh, Cambodia
  • Find this author on Google Scholar
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Sotham Sieng
3Department of Geology, GDMR, MIME, Phnom Penh, Cambodia
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Thomas S. N. Oliver
4School of Earth & Environmental Science, University of Wollongong, NSW 2522, Australia
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Sedimentology of Late Holocene fluvial levee and point-bar deposits from the Cambodian tract of the Mekong River

Marcello Gugliotta, Yoshiki Saito, Bunnarin Ben, Sotham Sieng and Thomas S. N. Oliver
Journal of the Geological Society, 175, 176-186, 30 August 2017, https://doi.org/10.1144/jgs2017-047
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