Digital Lithogeochemical Map of Bavaria 1:25,000 (dLGK25)

The digital lithogeochemical map of Bavaria 1:25 000 (dLGK25) is a thematic map on an overview scale. With regard to the delimitation of the units, it is derived directly from the current state of the digital geological map of Bavaria (dGK25), according to the approach of an integrated mapping. The map image shows the main geological units combined into lithogeochemical units (LGE), which are located near the surface below the ground zone (surface map). A lithogeochemical unit is composed of geological units which, within a defined geological period, had similar conditions of formation and thus predicted a characteristic chemical composition. A total of 184 LGEs are distinguished for Bavaria, in which up to three different lithologies (fixed rocks) or grain size fractions (locker rocks) are distinguished. The dataset contains statistical parameters (50th and 90th respectively. Percentile equivalent to median and background value) of the investigated elements (main, secondary and trace elements; measured with X-ray fluorescence analysis (RFA) or mass spectrometry with inductively coupled plasma (ICP-MS) in the differentiated LGE. For statistical evaluation, a sample number of more than 10 is required. While for the characterisation of the span distribution in the geochemical units a high number of samples distributed as much as possible would be ideal, there are often rather small sample numbers and/or spatially unequal distributions of the sampling points, which could lead to corresponding corrections in the spans in case of post-compression. The stated percentiles are always to be seen as an indication of the range of element concentrations within the geochemical units and thus do not provide any indication of the specific values to be found at a location. As far as possible, only representative rock samples of the units were taken into account for the evaluations, so that local peculiarities such as veins are usually not included. The accuracy of the representation depends on the geological conditions, it is at best 25 m according to the processing scale and is therefore generally not accurate. From the digital lithogeochemical map (dLGK25) no parcel-sharp statements or concrete indications of deeper rocks and geochemical properties can be derived directly. At the specific location, the rock or its expression may differ from the underlying conditions. The technical data correspond to the current state of data and knowledge of the Bavarian State Office for the Environment. No guarantee can be given for the completeness and correctness of the information provided.巴伐利亚州1:25000数字岩石地球化学图（digital lithogeochemical map of Bavaria 1:25 000，缩写dLGK25）为一幅概览比例尺专题地图。关于单元圈定，本图直接依托巴伐利亚州数字地质图（digital geological map of Bavaria, dGK25）的现行版本，采用一体化填图方法编制。该图展示了归并入岩石地球化学单元（lithogeochemical units, LGE）的主要地质单元，这些单元分布于地表以下的近地表带（地表图幅范围）。岩石地球化学单元由在特定地质时期内形成条件相似、因此具备特征性化学组成的地质单元所构成。巴伐利亚州共计划分出184个LGE，每个单元可区分至多3种不同岩性（固结岩石）或粒度组分（固结岩石）。本数据集包含经区分的LGE中各研究元素（主量、次要和微量元素；采用X射线荧光光谱分析（X-ray fluorescence analysis, RFA）或电感耦合等离子体质谱法（inductively coupled plasma mass spectrometry, ICP-MS）测定）的统计参数（分别为50th和90th百分位数，对应中位数与背景值）。统计评估要求样本量需大于10。尽管若要充分表征地球化学单元的分布跨度，理想情况下应配备尽可能多且分布均匀的采样点，但实际采样常存在样本量偏小、采样点空间分布不均的情况，在后处理压缩校正时可能需对跨度值进行相应调整。此处给出的百分位数仅用于指示地球化学单元内元素浓度的分布范围，无法反映某一具体点位的元素含量特征。评估过程中尽可能仅选取具有代表性的单元岩石样品，因此通常不会包含脉体等局部异常特征。成图精度取决于地质条件，按成图比例尺最高可达25米，因此整体精度有限。无法直接从dLGK25获取精准的地块级信息，也无法直接推断深部岩石及地球化学特征。在特定点位，实际岩石及其地球化学表现可能与图面反映的基底条件存在差异。本数据集的技术参数符合巴伐利亚州环境局（Bavarian State Office for the Environment）现行的数据与认知水平，不对所提供信息的完整性与准确性提供任何担保。