Elevation and age of a raised beach in the upper Gulf of Thailand, as evidence for regional sea level during the Late Holocene
Few constructional features of coastal geomorphology have been investigated at the northernmost extremity of the Gulf of Thailand (GoT), with a view to establishing the position (height) of local relative sea level (RSL) during the marine regression following the regional mid-Holocene highstand (MHH...
| Main Authors: | , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2024
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| Online Access: | https://hdl.handle.net/10356/179440 http://dx.doi.org/10.1016/j.jseaes.2024.106259 |
| _version_ | 1811693728506576896 |
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| author | Terry, James P. Goff, James Jankaew, Kruawun Lhosupasirirat, Kasidis Li, Tanghua Oalmann, Jeffrey Oliver, Grahame J. H. Parham, Peter R. |
| author2 | Asian School of the Environment |
| author_facet | Asian School of the Environment Terry, James P. Goff, James Jankaew, Kruawun Lhosupasirirat, Kasidis Li, Tanghua Oalmann, Jeffrey Oliver, Grahame J. H. Parham, Peter R. |
| author_sort | Terry, James P. |
| collection | NTU |
| description | Few constructional features of coastal geomorphology have been investigated at the northernmost extremity of the Gulf of Thailand (GoT), with a view to establishing the position (height) of local relative sea level (RSL) during the marine regression following the regional mid-Holocene highstand (MHH) that occurred at approximately 6.5 ka BP. Here, the work investigates a 2 m thick exposure of marine gravels on the coast of Ko Khang Khao islet in the eastern Bay of Bangkok. At an elevation of 3.3–5.3 m above modern sea level, the sequence is interpreted to represent a Holocene raised beach. The unlithified sediments comprise rounded quartz and mylonite pebbles and cobbles, oriented predominantly NE–SW, supported by fossiliferous sands that are rich in marine shells, coral fragments and occasional terrestrial gastropods. The juxtaposition of the marine and non-marine gastropoda of contemporaneous ages makes a compelling story for a coastal storm deposit, thrown up either by a winter monsoon storm, or by a palaeotyphoon that managed to penetrate the upper Gulf. Overlapping results of C14 and OSL age-dating of shell material and mineral sands suggest the raised (storm) beach formed between 3.5 and 4.0 ka BP, i.e. ∼ 2.5–3.0 ka after the MHH peak, at a height of ∼ 1.3–3.3 m above the local RSL position at that time (according to glacial isostatic adjustment modelling). Given the otherwise paucity of data from the upper GoT, the Ko Khang Khao raised beach provides new information that expands our current understanding of geographical variations in RSL across Southeast Asia during the Late Holocene. |
| first_indexed | 2024-10-01T06:56:18Z |
| format | Journal Article |
| id | ntu-10356/179440 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:56:18Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1794402024-08-06T15:36:52Z Elevation and age of a raised beach in the upper Gulf of Thailand, as evidence for regional sea level during the Late Holocene Terry, James P. Goff, James Jankaew, Kruawun Lhosupasirirat, Kasidis Li, Tanghua Oalmann, Jeffrey Oliver, Grahame J. H. Parham, Peter R. Asian School of the Environment Earth Observatory of Singapore Earth and Environmental Sciences Relative sea level Holocene highstand Coastal deposits Few constructional features of coastal geomorphology have been investigated at the northernmost extremity of the Gulf of Thailand (GoT), with a view to establishing the position (height) of local relative sea level (RSL) during the marine regression following the regional mid-Holocene highstand (MHH) that occurred at approximately 6.5 ka BP. Here, the work investigates a 2 m thick exposure of marine gravels on the coast of Ko Khang Khao islet in the eastern Bay of Bangkok. At an elevation of 3.3–5.3 m above modern sea level, the sequence is interpreted to represent a Holocene raised beach. The unlithified sediments comprise rounded quartz and mylonite pebbles and cobbles, oriented predominantly NE–SW, supported by fossiliferous sands that are rich in marine shells, coral fragments and occasional terrestrial gastropods. The juxtaposition of the marine and non-marine gastropoda of contemporaneous ages makes a compelling story for a coastal storm deposit, thrown up either by a winter monsoon storm, or by a palaeotyphoon that managed to penetrate the upper Gulf. Overlapping results of C14 and OSL age-dating of shell material and mineral sands suggest the raised (storm) beach formed between 3.5 and 4.0 ka BP, i.e. ∼ 2.5–3.0 ka after the MHH peak, at a height of ∼ 1.3–3.3 m above the local RSL position at that time (according to glacial isostatic adjustment modelling). Given the otherwise paucity of data from the upper GoT, the Ko Khang Khao raised beach provides new information that expands our current understanding of geographical variations in RSL across Southeast Asia during the Late Holocene. Ministry of Education (MOE) National Research Foundation (NRF) Submitted/Accepted version James Terry acknowledges research support from Zayed University, UAE, through grant no. R17036. Tanghua Li is supported by the Singapore Ministry of Education Academic Research Fund MOE2019- T3-1–004 and MOE-T2EP50120-0007, and the National Research Foundation of Singapore. 2024-07-31T06:57:28Z 2024-07-31T06:57:28Z 2024 Journal Article Terry, J. P., Goff, J., Jankaew, K., Lhosupasirirat, K., Li, T., Oalmann, J., Oliver, G. J. H. & Parham, P. R. (2024). Elevation and age of a raised beach in the upper Gulf of Thailand, as evidence for regional sea level during the Late Holocene. Journal of Asian Earth Sciences, 273, 106259-. https://dx.doi.org/10.1016/j.jseaes.2024.106259 1367-9120 https://hdl.handle.net/10356/179440 10.1016/j.jseaes.2024.106259 2-s2.0-85199045847 http://dx.doi.org/10.1016/j.jseaes.2024.106259 273 106259 en MOE2019-T3-1-004 MOE-T2EP50120-0007 Journal of Asian Earth Sciences © 2024 Elsevier Ltd. All rights reserved. This article may be downloaded for personal use only. Any other use requires prior permission of the copyright holder. The Version of Record is available online at http://doi.org/10.1016/j.jseaes.2024.106259. application/pdf |
| spellingShingle | Earth and Environmental Sciences Relative sea level Holocene highstand Coastal deposits Terry, James P. Goff, James Jankaew, Kruawun Lhosupasirirat, Kasidis Li, Tanghua Oalmann, Jeffrey Oliver, Grahame J. H. Parham, Peter R. Elevation and age of a raised beach in the upper Gulf of Thailand, as evidence for regional sea level during the Late Holocene |
| title | Elevation and age of a raised beach in the upper Gulf of Thailand, as evidence for regional sea level during the Late Holocene |
| title_full | Elevation and age of a raised beach in the upper Gulf of Thailand, as evidence for regional sea level during the Late Holocene |
| title_fullStr | Elevation and age of a raised beach in the upper Gulf of Thailand, as evidence for regional sea level during the Late Holocene |
| title_full_unstemmed | Elevation and age of a raised beach in the upper Gulf of Thailand, as evidence for regional sea level during the Late Holocene |
| title_short | Elevation and age of a raised beach in the upper Gulf of Thailand, as evidence for regional sea level during the Late Holocene |
| title_sort | elevation and age of a raised beach in the upper gulf of thailand as evidence for regional sea level during the late holocene |
| topic | Earth and Environmental Sciences Relative sea level Holocene highstand Coastal deposits |
| url | https://hdl.handle.net/10356/179440 http://dx.doi.org/10.1016/j.jseaes.2024.106259 |
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