Sediment Distribution German North Sea — Classification according to Figge (1981)

The card in scale 1: 250,000 represents the sediment distribution according to Figge (2013). This is based on a percentage distribution developed by Figge (1981) of the three combined grain size fractions 0.063-0.25 mm, 0.25-0.5 mm and 0.5-2 mm, which are divided into 4 sand classes in a triangle diagram. In addition, the fine fraction content < 0.063 mm is distinguished in 0-5 %, 6-10 %, 11-20 %, 21-50 % and > 50 % as well as fraction > 2 mm (kibbles, stones, solid rocks). The map is based on sediment samples from the seabed surface to a depth of 0.2 m as well as layer descriptions of holes at 0.2 m depth, which were available in the German North Sea region until November 2012. The basic data is stored in databases at the BSH and LBEG, and data collected in the future will be integrated into it. The map shows areas of similar curler sediments on the surface of the seabed. Curler sediments are classified according to their grain sizes according to DIN EN 14688-1: Clay (grain size < 0.002 mm); Schluff (grain size 0.002 to 0.063 mm); Sand (grain size 0.063 to 2.0 mm); Gravel (grain size 2.0 to 63 mm); Stones and blocks (> 63 mm). On the basis of the grain size analyses carried out in the laboratory as well as the layer descriptions from bores, grain size ranges are summarised for relevant questions and then classified.本比例尺为1:250000的专题地图依据Figge（2013）的研究方案呈现沉积物分布格局。该方案基于Figge（1981）提出的百分比划分方法，将0.063~0.25 mm、0.25~0.5 mm及0.5~2 mm三个合并粒级通过三角图解划分为4个砂质沉积物类别。此外，细粒级（粒径<0.063 mm）的含量被划分为0~5%、6%~10%、11%~20%、21%~50%及>50%五个等级，同时区分出粒径>2 mm的组分（砾石、石块、基岩）。本地图的数据基础为2012年11月之前德国北海海域范围内0.2 m以浅的海底表层沉积物样品，以及0.2 m深度钻孔的地层描述资料。基础数据存储于BSH与LBEG的数据库中，后续采集的相关数据亦将整合入库。 本地图展示了海底表层相似卷曲沉积物（curler sediments）的分布区域。卷曲沉积物依据DIN EN 14688-1标准按粒径进行分类：黏土（粒径<0.002 mm）；粉砂（Schluff，粒径0.002~0.063 mm）；砂（粒径0.063~2.0 mm）；砾石（粒径2.0~63 mm）；石块与块石（粒径>63 mm）。基于实验室完成的粒度分析结果与钻孔地层编录资料，针对相关研究需求对粒级范围进行归并并完成分类。