Timing of Holocene sand accumulation along the coast of central and SE Vietnam |
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Authors: | Dam Quang-Minh Manfred Frechen Tran Nghi Jan Harff |
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Institution: | 1. Faculty of Geology, University of Science, 334 Nguyen Trai, Hanoi, Vietnam 3. Baltic Sea Research Institute, Seestr. 15, 18119, Rostock-Warnemünde, Germany 2. Leibniz Institute for Applied Geophysics, Section S3: Geochronology and Isotope Hydrology, Stilleweg 2, 30655, Hannover, Germany
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Abstract: | In Vietnam, the coastal sand barriers and dunes located in front of the steep slopes of the high rising Truong Son Mountains
are sensitive to climate and environment change and give evidence for Holocene sea-level rise. The outer barrier sands were
deposited shortly before or contemporaneous with the local sea-level high stand along the Van Phong Bay postdating the last
glacial maximum (LGM). Optically stimulated luminescence (OSL) dating yielded deposition ages ranging from 8.3 ± 0.6 to 6.2 ± 0.3 ka
for the stratigraphically oldest exposed barrier sands. Further periods of sand accumulation took place between 2.7 and 2.5 ka
and between 0.7 and 0.5 ka. The youngest period of sand mobilisation was dated to 0.2 ± 0.01 ka and is most likely related
to reworked sand from mining activities. At the Suoi Tien section in southern central Vietnam, the deposition of the inner
barrier sands very likely correlate with an earlier sea-level high stand prior to the last glaciation. OSL age estimates range
from 276 ± 17 to 139 ± 15 ka. OSL dating significantly improves our knowledge about the sedimentary dynamics along the coast
of Vietnam during the Holocene. |
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