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Spatial variability of recent sedimentation rates in the Eastern Gotland Basin (Baltic Sea)

机译：东哥得兰盆地（波罗的海）近期沉积速率的空间变异性

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In order to study recent sedimentation rates in the Eastern Gotland Basin, 52 short sediment cores collected from the deepest part (< 150 m) of the Basin in 2003 were investigated. The upper parts of all the cores were distinctly laminated and dark in colour, followed by a homogeneous, greyish lower part. The thickness of the laminated sequences varied from 17 to 300 mm. 210Pb dating analyses of selected cores revealed that the change from non-laminated to laminated sediments happened about 100 years ago, indicating a shift from predominantly oxic bottom water conditions to anoxic conditions. Used as a time marker, this shift in the sediment texture enabled sediment accumulation rates to be estimated for all sediment cores. The observed mean linear sedimentation rate for the whole basin was 0.93 ± 0.67 mm y-1. The respective bulk sediment accumulation rates ranged from 10.5 to 527 g m-2 yr-1 with an average of 129 ± 112 g m-2 yr-1, indicating a high spatial variability of sedimentation rates within the basin. This agrees very well with the long-term sedimentation pattern since the Litorina transgression. The observed pattern clearly reflects the hydrographic conditions at the seafloor as studied by modelled near-bottom current velocities.
机译：为了研究东部哥特兰盆地的近期沉积速率，调查了2003年从该盆地最深部分（<150 m）收集的52个短沉积岩心。所有核的上部明显地被层压并且颜色深，随后是均匀的灰色下部。层压序列的厚度从17到300 mm不等。选定岩心的210Pb年代测定分析表明，从非层状沉积物到层状沉积物的变化发生在大约100年前，这表明从主要的含氧底水条件转变为无氧条件。用作时间标记，沉积物质地的这种变化使得可以估算所有沉积物核心的沉积物积累速率。整个盆地观测到的平均线性沉积速率为0.93±0.67 mm y-1。各自的沉积物堆积速率分别为10.5至527 g m-2 yr-1，平均为129±112 g m-2 yr-1，表明该盆地内沉积速率的空间变化很大。这与Litorina入侵以来的长期沉积模式非常吻合。观测到的模式清楚地反映了海底的水文条件，这是通过模拟的近底海流速度进行研究的。

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