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Mid to late Holocene sea-level reconstruction of Southeast Vietnam using beachrock and beach-ridge deposits

机译：利用滩涂和滩脊沉积物对越南东南部全新世海平面进行后期重建

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摘要

Beachrocks, beach ridge, washover and backshore deposits along the tectonically stable south-eastern Vietnamese coast document Holocene sea level changes. In combination with data from the final marine flooding phase of the incised Mekong River valley, the sea-level history of South Vietnam could be reconstructed for the last 8000 years. Connecting saltmarsh, mangrove and beachrock deposits the record covers the last phase of deglacial sea-level rise from -5 to +1.4 m between 8.1 to 6.4 ka. The rates of sea-level rise decreased sharply after the rapid early Holocene rise and stabilized at a rate of 4.5 mm/year between 8.0 and 6.9 ka. Southeast Vietnam beachrocks reveal that the mid-Holocene sea-level highstand slightly above +1.4 m was reached between 6.7 and 5.0 ka, with a peak value close to +1.5 m around 6.0 ka. This highstand is further limited by a backshore and beachridge deposit that marks the maximum springtide sea-level just below the base of the overlying beach ridge. After 5.0 ka sea level dropped below +1.4 m and fell almost linearly at a rate of 0.24 mm/year until 0.63 ka and + 0.2 m as evidenced by the youngest beachrocks. The Holocene sea-level fluctuations observed in Southeast Vietnam resulted from eustatic and isostatic processes. The sea-level rise up to the mid-Holocene highstand was provoked by the last melting phase of glacial polar ice-sheets. The sea-level drop after the mid-Holocene highstand was induced by the isostatic processes of continental levering with an uplift of continents in low latitudes and depression of adjacent flooded continental shelf areas and Equatorial Ocean Siphoning transferring oceanic waters from low latitudes to the increasing volume of oceanic basins in higher latitudes. The regional expression in terms of magnitude and timing of relative sea-level change might contribute to validation of geophysical model simulations.
机译：越南东南部构造稳定的沿海岩石，海滩山脊，冲刷物和后岸沉积物记录了全新世海平面的变化。结合切开的湄公河流域最终海洋洪水阶段的数据，可以重建越南南部过去8000年的海平面历史。连接盐沼，红树林和滩石沉积物的记录涵盖了冰川末期海平面上升的最后阶段，从8.1到6.4 ka在-5至+1.4 m之间。全新世早期迅速上升之后，海平面上升速率急剧下降，并在8.0至6.9 ka之间稳定在4.5 mm /年。越南东南部的滩石显示，全新世中期海平面高位略高于+1.4 m，在6.7至5.0 ka之间达到峰值，在6.0 ka附近的峰值接近+1.5 m。该高潮进一步受到沿岸和滩脊沉积物的限制，该沉积物标志着刚好位于上覆滩脊底部下方的最大潮汐海平面。在5.0 ka之后，海平面下降到+1.4 m以下，并以0.24 mm /年的速度几乎线性下降，直到0.63 ka和+ 0.2 m为止，这是最年轻的滩涂所证明的。在越南东南部发现的全新世海平面波动是由恒动和等静过程引起的。冰川极性冰盖的最后一个融化阶段引起了直到全新世中期的海平面上升。全新世中期高点之后的海平面下降是由于低纬度大陆的抬高，邻近洪泛大陆架地区的凹陷和赤道海洋虹吸等距过程的等静压过程引起的，赤道虹吸管将海洋水从低纬度转移到增加的体积高纬度的海洋盆地。就相对海平面变化的大小和时间而言，区域表达可能有助于地球物理模型模拟的验证。

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  • 来源
    《Global and planetary change》 |2013年第ptab期|214-222|共9页
  • 作者

    Karl Stattegger; Rik Tjallingii; Yoshiki Saito; Maximiliano Michelli; Nguyen Trung Thanh; Andreas Wetzel;

  • 作者单位

    Institute of Geosciences, University of Kiel Otto-Hahn-Platz 1, D-24118, Kiel-Germany;

    NIOZ-Royal Netherlands Institute for Sea Research, Landsdiep 4, NL-1797 SZ Texel, The Netherlands;

    Institute of Geology and Geoinformation, Geological Survey of Japan, A1ST. Central 7, Higashi 1-1-1, Tsukuba, Ibaraki, 305-8567, Japan;

    Institute of Geosciences, University of Kiel Otto-Hahn-Platz 1, D-24118, Kiel-Germany;

    Institute of Marine Geology and Geophysics, VAST, 18 Hoang Quoc, Hanoi Vietnam;

    Geological and Paleontological Institute, University of Basel, Bemoullistrasse 32, CH-4056 Basel, Switzerland;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Southeast-Vietnam coast; Holocene; Sea level; Mid-Holocene sea-level highstand;

    机译：越南东南沿海;全新世海平面;全新世中期海平面高点;

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