Stratigraphy and optically stimulated luminescence (OSL) dating of a Quaternary sequence along the Dong Nai River, southern Vietnam |
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| Authors: | Toshiyuki Kitazawa Takahiro Nakagawa Tetsuo Hashimoto Masaaki Tateishi |
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| Institution: | aGraduate School of Science and Technology, Shinshu University, Matsumoto 390-8621, Japan;bGraduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan;cDepartment of Chemistry, Faculty of Science, Niigata University, Niigata 950-2181, Japan;dDepartment of Geology, Faculty of Science, Niigata University, Niigata 950-2181, Japan |
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| Abstract: | The pre-Holocene Cenozoic sequence outcrops in the terrestrial part of the eastern margin of the Mekong Basin. However, the stratigraphy of the sequence is still unclear. Its detailed stratigraphy and chronology were therefore studied along the Dong Nai River, southern Vietnam, and the lithofacies and the relations among the formations were investigated from the outcrops. The ages of the deposits were determined by using optically stimulated luminescence (OSL) dating.The Ba Mieu Formation was deposited about 176±52 ka during marine isotope stage (MIS) 7–6. The Thu Duc Formation was deposited about 97±27 ka during MIS 5. Both the Ba Mieu and Thu Duc formations are composed of fluvial and tidally influenced coastal deposits. The newly proposed Nhon Trach Formation was originally an eolian (blanket) deposit, but it has been partly reworked by fluvial processes. The Nhon Trach Formation was deposited about 10.9±4.7 ka, in the last part of the Pleistocene to the beginning of the Holocene. The OSL ages for the Ba Mieu, Thu Duc, and Nhon Trach formations are younger than the ages previously assigned to these formations. |
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| Keywords: | Pleistocene marine isotope stage optically stimulated luminescence (OSL) dating Dong Nai River Mekong Basin |
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