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Distinguishing Late Holocene Storm Deposit From Shore-normal Beach Sediments From the Gulf of Thailand
Frontiers in Earth Science ( IF 2.689 ) Pub Date : 2021-01-11 , DOI: 10.3389/feart.2021.625926
Stapana Kongsen; Sumet Phantuwongraj; Montri Choowong

Grain size, as one of sedimentological proxies, coupled with a detailed description of the sedimentary structures and luminescence dating were used to unveil the sediment sources and transport process of the Holocene ancient coastal storm events recorded in the beach ridge plain, wet swale and muddy environments at Prachuap Khiri Khan, in the Southern Peninsula of Thailand. In this study, a total of 141 sand samples were collected from the shore-normal ridge-swale topography and analyzed for layers of candidate storm deposits, revealing at least 21 candidate coastal storm events. The grain size distribution of beach sediments was, in general, unimodal, while the candidate storm sediments revealed a mixed combination of multimodal, bimodal and unimodal distributions. Plots of mean grain size against skewness and kurtosis and of skewness against kurtosis could differentiate storm deposits from shore-normal beach sediments. Sedimentary structures preserved in the ancient coastal storm deposits included parallel and inclined landward laminations, mud rip-up clasts, layers of shell fragments, a pebble grain, normal and reverse grading and sharp lower and upper contacts. Candidate storm layers overlain on a dry beach ridge intervened with mud in a swale showed a finer and thinner landward deposit. Marine shell fragments, smaller foraminifers, ostracod and scaphopod (tusk shell), were well preserved. Based on optically stimulated luminescence dating and a correlated accelerator mass spectrometry age, multiple layers of sand derived from different frequencies of coastal storms were deposited over the middle to late Holocene.



中文翻译:

从泰国湾的岸上正常海滩沉积物中区分晚全新世风暴沉积

作为沉积学代理之一的粒度,结合对沉积结构和发光年代的详细描述,揭示了在沙滩脊平原,湿wet和泥泞环境中记录的全新世古代沿海风暴事件的沉积物来源和运输过程。在泰国南部半岛的班武里府(Prachuap Khiri Khan)。在这项研究中,总共从海岸正常的脊-脊地形收集了141个沙样,并分析了候选风暴沉积层,揭示了至少21个候选沿海风暴事件。沙滩沉积物的粒度分布通常为单峰分布,而候选风暴沉积物则显示出多峰分布,双峰分布和单峰分布的混合组合。平均晶粒度与偏斜度和峰度的关系以及偏斜与峰度的关系图可以将风暴沉积物与海岸正常海滩沉积物区分开。古代沿海风暴沉积物中保存的沉积物结构包括平行和倾斜的陆向叠层,泥浆剥落碎屑,壳碎片层,卵石颗粒,正反梯度以及上下明显的接触。候选人的风暴层覆盖在干燥的沙滩山脊上,并被泥泞的泥泞打扰,这表明陆上沉积物更细更薄。很好地保存了海洋贝壳碎片,较小的有孔虫,成虫和鳞甲(象牙壳)。根据光激发发光测年和相关的加速器质谱年龄,

更新日期:2021-02-22
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