Summarised presentation of the results of the geochemical investigations in Germany in the period 1975 - 1986, Lead in stream sediments, Single element maps

Between 1975 and 1986, geochemical investigations were carried out by the Federal Institute for Geosciences and Natural Resources (BGR) on the territory of the then Federal Republic of Germany and by the Central Geological Institute (ZGI) of the former GDR in the area of the pre-Upper Permian bedrock units in the southern part of the former GDR, which lie on the earth's surface or are slightly covered by the Cenozoic. Approximately 98,000 water and 87,500 stream sediment samples were taken and geochemically analysed. The results of these investigations were published in the "Geochemical Atlas of the Federal Republic of Germany" (Fauth et al., 1985) and in the "Final Report on the Comparative Evaluation of the Raw Material Potential in the Bedrock Units of the GDR" (Röllig et al., 1990; in German). The geochemical data collected as part of these investigations, which cover a large part of the area of today's Federal Republic of Germany, are unique in their high sampling density. All subsequent geochemical investigations were carried out with a much lower sample density. These valuable and irretrievable data have been generally accessible via the BGR geoportal since their digital processing and provision in 2022 (Geochemical Atlas of the Federal Republic of Germany) and 2023 (Geochemical Prospection in the bedrock units in the southern part of the former GDR). However, a direct comparison of the maps produced for the two sub-areas is not possible due to the differences in the analytical methods used in the investigations (investigated element spectrum, analytical quality, determination limits, ...). Nevertheless, for some of the investigated elements and parameters it is possible to summarise the results of these geochemical investigations, which are unique in their high occupancy density, with appropriate adjustments (determination limits, representable content ranges, classification of the map legends, ...). Such summarised representations are now being made available for the first time via the BGR geoportal. The downloads show the distribution of Lead contents in stream sediments in four different coloured point and colour shaded contour maps.1975年至1986年间，地球科学与自然资源联邦研究所（BGR）在当时的德意志联邦共和国领土范围内开展地球化学调查，前民主德国中央地质研究所（ZGI）则在前民主德国南部的晚二叠世前（pre-Upper Permian）基岩单元区域——该区域或直接出露地表，或被新生代（Cenozoic）沉积物轻微覆盖——开展了同类调查。 本次调查共采集约98000份水体样品与87500份河流沉积物（stream sediment）样品，并完成地球化学分析。相关调查成果分别发表于《德意志联邦共和国地球化学图集（Geochemical Atlas of the Federal Republic of Germany）》（Fauth等，1985）与《前民主德国基岩单元原料潜力对比评估最终报告》（Röllig等，1990，德文版）。 本次调查采集的地球化学数据覆盖当今德意志联邦共和国大部分区域，以极高的采样密度独树一帜，后续所有地球化学调查的采样密度均远低于该数据集。 这些珍贵且不可复得的数据在完成数字化处理与发布后，自2022年（对应《德意志联邦共和国地球化学图集》）与2023年（对应《前民主德国南部基岩单元地球化学勘探（Geochemical Prospection in the bedrock units in the southern part of the former GDR）》）起，可通过BGR地理门户（geoportal）公开获取。但由于两项调查采用的分析方法存在差异（包括分析元素谱、分析质量、检出限（determination limits）等），无法直接对两个子区域生成的地球化学图件进行对比。 不过，针对部分调查元素与参数，可通过适当调整（如检出限、可表征含量范围、地图图例（map legends）分级等），对这一以高采样密度为特色的独特数据集的成果进行汇总整合。此类汇总成果目前首次通过BGR地理门户对外发布。本次下载资源包含四张采用不同色彩点标记与色彩晕染等值线图（colour shaded contour maps）绘制的河流沉积物铅含量（Lead contents）分布图。