Late Holocene sedimentary and environmental development of the northern Mekong River Delta, Vietnam
Late Holocene sedimentary and environmental development of the northern Mekong River Delta, Vietnam
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DOI：
10.1016/j.quaint.2009.11.032
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发表时间：
2011-01
影响因子：
2.2
通讯作者：
Ulrike Proske;T. Hanebuth;J. Gröger;Bùi Phát Diệm
中科院分区：
文献类型：
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作者：
Ulrike Proske;T. Hanebuth;J. Gröger;Bùi Phát Diệm
通过对湄公河三角洲北部三个沉积物岩心的沉积学和孢粉学研究，揭示了中全新世以来的区域沉积和环境发展。在最北端的岩心处记录有全新世中期的亚潮间带沉积。三个岩心的岸线沉积物年龄由北向南依次递减，记录了1)晚全新世早期的退变和2)随后的三角洲沉积。三角洲平原序列从具有沼泽样元素的漫滩沉积物到天然堤防沉积物不等。各岩心最上层沉积物均有不同程度的人为干扰。最北端的岩心变化最为强烈，孢粉信号和木炭峰显示了现代土地开垦过程中环境的深刻变化。三个岩心中至少有一个的沉积物并没有显示出“真正的”三角洲相序列，而是显示出类似河口的特征，正如在柬埔寨南部的记录中观察到的那样。这种缺失可能是由于三角洲快速进积的初始阶段缺乏容纳空间，阻碍了“真正的”三角洲序列的发展，如湄公河三角洲南部的岩心所示。
A sedimentological and palynological study of three sediment cores from the northern Mekong River Delta shows the regional sedimentary and environmental development since the mid-Holocene sea level highstand. A sub- to intertidal flat deposit of mid-Holocene age is recorded in the northernmost core. Shoreline deposits in all three cores show descending ages from N to S documenting 1) the early stages of the late Holocene regression and 2) the subsequent delta progradation. The delta plain successions vary from floodplain deposits with swamp-like elements to natural levee sediments. The uppermost sediments in all cores show human disturbance to varying degrees. The most intense alteration is recorded in the northernmost core where the palynological signal together with a charcoal peak indicates the profound change of the environment during the modern land reclamation. The sediments from at least one of the three presented cores do not show a “true” delta facies succession, but rather estuary-like features, as also observed in records from southern Cambodia. This absence is probably due to lack of accommodation space during the initial phase of rapid delta progradation which impeded the development of “true” delta successions as shown in cores from the southern Mekong River Delta.