Elemental and mineralogical analysis of marine and coastal sediments from Phra Thong Island, Thailand: Insights into the provenance of coastal hazard deposits
Elemental and mineralogical analysis of marine and coastal sediments from Phra Thong Island, Thailand: Insights into the provenance of coastal hazard deposits
复制标题
泰国帕通岛海洋和沿海沉积物的元素和矿物学分析：深入了解沿海灾害沉积物的来源
DOI：
10.1016/j.margeo.2017.01.004
复制
发表时间：
2017
期刊：
影响因子：
2.9
通讯作者：
P. Carr
中科院分区：
文献类型：
--
作者：
D. T. Pham;C. Gouramanis;A. Switzer;C. Rubin;Brian;G. Jones;K. Jankaew;P. Carr
沿海灾害(如海啸和/或风暴)留下的沉积物记录可能有助于了解此类事件期间发生的沉积和水动力过程。现代陆上和近海沉积物样品与2004年印度洋海啸、3次古海啸和2007年泰国Phra Thong岛的风暴沉积物进行了比较，以确定这些沿海冲刷沉积物之间的来源关系。沉积学和地层学特征一般不足以区分海啸和风暴沉积，因此采用了基于粒度、矿物学和微量元素地球化学的统计方法(包括聚类分析、主成分分析和判别函数分析)。矿物含量和微量元素地球化学在统计上不足以区分该地点现代风暴和海啸沉积的来源，但平均粒度可以潜在地区分这些溢流沉积。2007年的风暴潮沉积物最有可能来自陆上沉积物环境，而所有四个海啸单元在统计上都不同，表明沉积物来源不同。我们的统计分析表明，2004年的海啸沉积物主要来自近岸海洋沉积物。最上层的古海啸沉积物可能来自陆上和近岸物质，而下部的古海啸沉积物没有明确的证据表明其沉积物来源。这种复杂性提出了关于海啸和风暴沉积中沉积物来源的问题，并强烈表明，当地背景和古地理是海啸起源研究中不能忽视的重要方面。
Sediment records left by coastal hazards (e.g. tsunami and/or storms) may shed light on the sedimentary and hydrodynamic processes happening during such events. Modern onshore and offshore sediment samples were compared with the 2004 Indian Ocean Tsunami, three palaeotsunami and a 2007 storm deposit from Phra Thong Island, Thailand, to determine provenance relationships between these coastal overwash deposits. Sedimentological and stratigraphic characteristics are generally inadequate to discriminate tsunami and storm deposits so a statistical approach (including cluster analysis, principal component analysis and discriminant function analysis) was used based on grain size, mineralogy and trace element geochemistry. The mineral content and trace element geochemistry are statistically inadequate to distinguish the provenance of the modern storm and tsunami deposits at this site, but the mean grain size can potentially discriminate these overwash deposits. The 2007 storm surge deposits were most likely sourced from the onshore sediment environment whereas all four tsunami units statistically differ from each other indicating diverse sediment sources. Our statistical analyses suggest that the 2004 tsunami deposit was mainly derived from nearshore marine sediments. The uppermost palaeotsunami deposit was possibly derived from both onshore and nearshore materials while the lower palaeotsunami deposits showed no clear evidence of their sediment sources. Such complexity raises questions about the origin of the sediments in the tsunami and storm deposits and strongly suggests that local context and palaeogeography are important aspects that cannot be ignored in tsunami provenance studies.
影响因子：
3
作者：
Feldens, P.;Schwarzer, K.;Sompongchaiyakul, P.
通讯作者：
Sompongchaiyakul, P.