Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/144151
Title: LOESS AND FOUND: CHARACTERISING A TROPICAL LOESS IN CHIANGMAI, THAILAND
Authors: VERONICA TAN YI YING
Keywords: tropical loess, aeolian sediment, Chiang Mai, Thailand
Issue Date: 2018
Citation: VERONICA TAN YI YING (2018). LOESS AND FOUND: CHARACTERISING A TROPICAL LOESS IN CHIANGMAI, THAILAND. ScholarBank@NUS Repository.
Abstract: Loess, as an accumulation of sediment of aeolian origin, is typically observed in the world’s temperate region. However, it is not commonly associated with the humid tropics. Nevertheless, the presence of loess deposits has been identified in Southeast Asia, such as the Thu Duc Formation in Vietnam, and the Batambang Grey Earth in Cambodia, and several areas in Khon Kaen Province of Thailand. Similarly, areas of the characteristic reddish-brown, silt-sized, loess-like sediments have been observed in Chiang Mai, Thailand, which are often confused with lateritic soils. This sediment material has yet to be identified (i.e. whether it is loess or laterite); and no quantitative evidence has been put forth to pinpoint is likely source. Through laboratory analyses of samples collected from Chiang Mai, this thesis examines the physical characteristics (i.e. particle size distribution, colour), geochemistry (i.e. major oxides, trace elements, total organic carbon) and age of these sediments, while comparing them to the loess deposit in Khon Kaen and to other reddish-brown soil material (e.g. laterite, an Oxisol) in Chiang Mai. This study confirms the aeolian nature of the Chiang Mai sediments, and establishes that these deposits are indeed loess. Three likely provenances are suggested for the Chiang Mai Loess, namely the Khorat Plateau, Doi Suthep, and the East Asian Continental Shelf. Lastly, this thesis compares the influence of the parent material, and the effect of post-depositional processes on the characteristics of these loess deposits. While neither factors can be wholly accountable for the characteristics of the loess deposits, the discussion provides a deeper insight into the geographical contexts that determine them.
URI: http://scholarbank.nus.edu.sg/handle/10635/144151
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