Mineral commodities - Gravel deposit (WMS)

The map of gravel deposits on a scale of 1 : 250,000 shows the distribution of sediments that contain gravel. The gravel fractions in the upper 0.2 m below the seabed surface are shown over the entire area. In the depth intervals 0-1 m, 1-2 m and 2-3 m, the gravel occurrences are additionally mapped selectively, depending on the drilling data. The proportion of gravel in the sediment is subdivided into five classes, each in gradations of 20 wt.% gravel. The maps are based on sediment samples taken from the seabed surface down to a depth of 0.2 m and on layer descriptions from boreholes.本数据集包含1:25万比例尺的砾石沉积分布图，用于展示含砾石沉积物的空间分布特征。该图完整呈现了海床表面以下0.2米上层沉积物中的砾石占比；针对0-1米、1-2米及2-3米深度区间，本数据集依据钻孔数据，选择性绘制了对应深度内的砾石赋存情况。沉积物中砾石的含量被划分为5个等级，各等级以20%重量百分比（wt.%）为梯度递进。本图集的编制依托两类基础资料：一是采集自海床表面至0.2米深度的沉积物样品，二是钻孔的地层描述记录。