Distribution of mineral raw materials — gravel deposits Drilling data analysis 0-1 m GOK

The map Distribution of mineral raw materials in the German North Sea — gravel deposits provides information on the distribution of sediments classified according to their gravel content. The background for the identification of the gravel content is the continuously high demand of this mineral raw material, e.g. for the construction industry. This map covers the area of the entire German North Sea in scale 1: 250,000 with a statement on the sediments of the upper 0.2 m from the seabed surface. Three additional maps show evaluations of drilling data at the intervals 0-1 m, 1-2 m and 2-3 m. The legend comprises five classes in gradations of 20 % gravel content by weight. The map is based on sediment samples from the seabed surface to a depth of 0.2 m as well as layer descriptions of drilling that 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 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 drilling, the sediments are classified for relevant questions.《德国北海矿产资源分布——砾石矿床》专题地图展示了按砾石含量分级的沉积物空间分布特征。本数据集编制的核心背景是建筑行业等领域对该矿产原料持续高涨的市场需求。该主地图比例尺为1:250000，覆盖整个德国北海海域，展示海床表面以下0.2米深度范围内的上层沉积物分布信息。另有三张附属地图分别呈现了0-1米、1-2米及2-3米深度区间的钻孔数据解译成果。图例共设5个分级档位，按重量计砾石含量每级递增20%。本地图的数据基础为2012年11月前德国北海海域已获取的海床表面至0.2米深度的沉积物样品，以及钻孔地层描述资料。基础数据存储于BSH与LBEG的数据库中，后续采集的相关数据也将整合入库。 岩心沉积物按粒径大小遵循欧洲标准DIN EN 14688-1进行分级：黏土（粒径<0.002毫米）；粉砂（粒径0.002~0.063毫米）；砂（粒径0.063~2.0毫米）；砾石（粒径2.0~63毫米）；石块与块石（粒径>63毫米）。研究人员基于实验室粒度分析结果与钻孔地层描述资料，针对相关应用与研究需求对沉积物开展分级归类工作。