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  • The KOR250 in the scale of 1:250,000 shows occurrences and deposits of mineral resources in Germany, which lie close to the Earth’s surface, i.e. can be mined in open-pits, quarries or near-surface mines. These mineral resources include industrial minerals, aggregates, peat, lignite, oil shales, and natural brines. The map is the digital successor of the map series KOR200 „Map of Near-Surface Deposits of the Federal Republic of Germany 1:200,000”, which has been published since 1984. The KOR200 and KOR250 have been published by the Federal Institute for Geosciences and Natural Resources together with the State Geological Surveys of the federal states on behalf of the Federal Ministry for Economic Affairs and Energy. Primary purpose of the KOR250 is to display Germany’s potential of domestic raw materials in a comparable way. The explanations given in the printed booklets accompanying the KOR200 are not available in the digital KOR250. In the KOR250 besides the defined deposits and differently coloured areas of raw materials, "active mines" (= operations) at time of publication or "focal points of several active mines" are marked with one symbol each. These symbols often display the headquarters of the mining company and not the mining site itself. As the map sheets of the KOR200 have been generated over more than three decades the timeliness of data is extremely different. For more detail, the current large-scale raw material maps of the Federal State Geological Surveys should always be consulted.

  • Web Map Service (WMS) of the map Heavy metal and trace element background values in German soils. New, nationwide background values for 16 heavy metals and trace elements were published by the LABO in 2017. They are based on profile descriptions and measurements of aqua regia extracts, which were combined and homogenized by the BGR. Measurements with high quantification limits were excluded from further evaluation according to certain criteria in order to avoid their influence on the derivation of background values. To prevent the background values from being disproportionately influenced by regions with high sample densities, spatial thinning was partially performed. The values of several horizons of a site were combined to one value by depth-weighted averages. For evaluation, the available measured values were assigned to different groups of soil parent materials. In addition, a distinction was made whether the samples were taken in the topsoil, in the subsoil or in the underground. In the case of topsoil, the different land use (arable land, grassland, forest) was also taken into account for the evaluation. Unconsolidated rocks were evaluated separately for northern and southern Germany due to their different composition. By dividing the data into sub-collectives, reliable case numbers were not achieved in all cases. Consequently, only background values with case numbers ?20 are presented. The exact derivation procedure can be found in the report of the LABO-Bund/Länder-Arbeitsgemeinschaft Bodenschutz (2017): 'Hintergrundwerte für anorganische und organische Stoffe in Böden', 4th revised and supplemented edition.

  • The maps show the thickness (in m) of the Holocene and Pleistocene layer sequences and the depth (in m below sea level) of the base of the Holocene and Pleistocene sedimentary sequences in the area of the German North Sea. For a more detailed description, see the associated data set.

  • Horizontal cross-section maps display the geological situation at a given depth. In concurrence of maps at different depths areal bedding conditions can be determined, e.g. to generally assess and interpret the spread of different stratigraphic units. Clearly visible are extent and shape of the salt structures within their regional context at the different depths, with extent and boundary of the salt structures having been the main focus of the project. Four horizontal cross-section maps covering the whole onshore area of Northern Germany have been developed at a scale of 1:500.000. The maps cover the depths of -500, -1000, -1500, -2000 m below NN. The four depths were selected by the project partners and are based on typical depth requirements of existing salt caverns in Northern Germany, mainly related to hydrocarbon storage. The shapes of the structures show rudimentary information of their geometry and their change with depths. In addition they form the starting point for rock mechanical calculations necessary for the planning and construction of salt caverns for storage as well as for assessing storage potentials. The maps can be used as a pre-selection tool for subsurface uses. It can also be used to assess coverage and extension of salt structures. As, at the time of preparation of the maps, energy storage and cavern operation in offshore areas could not be assumed as a priority, such areas were not treated within the project. All horizontal cross-section maps were adjusted with the respective state geological survey organisations.

  • The geological overview map (GÜK200) provides detailed information on the stratigraphy, petrography and genesis of the geological units shown. In the revised GÜK200, the surface geology on the mainland is shown in up to two overlays. The shallow, overlying soil is not shown. In the marine area, only the petrography of the recent seabed is shown, which comprises the uppermost 20 cm of the seabed. In accordance with the original GÜK200 map sheets, the seabed is addressed stratigraphically as recent seabed. The entire map area is dominated by Quaternary formations, whereby a distinction is made between Pleistocene and Holocene deposits. The Pleistocene deposits are dominated by the glacial deposits of the Elster, Saale and Weichselian cold periods, with glacial basin sediments, boulder clay of the ground moraines and glaciofluvial, fluviatile and aeolian deposits. After the end of the glaciations with the rising sea level, the various marine facies, sediments of the land/sea transition zone and on land, above all the fens and raised bogs dominate in the Holocene. Outcrops of older geological units are linked to the dynamics of the Zechstein salts in the subsurface and only occur sporadically in the map area, such as the well-known red sandstone cliffs of Helgoland.

  • The map “Groundwater resources in the ECOWAS region” captures and standardises existing groundwater data of West Africa and gives a consistent regional overview on the groundwater resources. It provides a quantitative assessment of aquifer productivity using a combination of aquifer flow type and expected borehole yield. The map highlights the suitability of aquifers for water supply on different scales while at the same time showing the physical limits of groundwater development. Map elaboration comprised the harmonisation of existing continental and regional geological maps and the attribution of hydrogeological units with expected yield data compiled from a literature metasurvey. Insert maps highlight the geological structure, geogenic background levels of arsenic and fluoride, and groundwater recharge.

  • The Soil Liquefaction Potential map presents information on the distribution of sediments at the seabed surface, which due to their specific grain size distributions, may be prone to soil liquefaction under external load effects (development of excess pore water pressure). The sediments are usually narrowly graded coarse silt to medium sands. The effect of soil liquefaction can be important for construction measures and structures, such as pipelines and submarine cables on the seabed. The map covers the area of the entire German North Sea at a scale of 1 : 250,000 with a statement on the sediments of the upper 0.2 m from the seabed surface. Two additional maps show the results of the evaluation of drilling data at depths of 1 m and 2 m below the seabed. The maps are based on sediment samples from the seabed surface down to a depth of 0.2 m as well as layer descriptions from drillings in the above-mentioned depth ranges, which were available until April 2012. The unconsolidated sediments are classified according to their grain sizes according to DIN EN 14688-1: Clay (grain size <0.002 mm); Silt (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 (grain size >63 mm). Based on the grain size analyses carried out in the laboratory, the layer descriptions from boreholes and the grain sorting, the sediments are classified on the basis of the classification of STUDER & KOLLER (1997). The legend includes two classes, soil liquefaction "potentially possible" and "not expected".

  • The map of the plant available water in Germany gives an overview of the amount of water which is available for plant growth in the summer period (April – September). It is the sum of the available water holding capacity of soils the precipitation in summer and the amount of capillary rise. The map was made on the basis of the land use stratified soil map of Germany at a scale of 1:1,1000,000, climate data for the period of 1961–1990 and land use information is derived from the Corine Land Cover data set (2006). The method is part of the TUB_BGR approach to model seepage water and is published in the documentation of Ad-hoc-AG Boden (representing the soil experts of the geological services of the German federal states).

  • This dataset has been compiled within the BGR project "D-AERO-Auswertung" based on several survey area located along the German North Sea coast. The BGR helicopter (Sikorsky S-76B) is used for airborne geophysical surveying of the Earth’s subsurface. The standard equipment comprises the methods electromagnetics, magnetics and radiometrics. The passive magnetic (HMG) system consists of two Cesium magnetometers, which are located in the HEM flying tube (bird) about 40 m beneath the helicopter as well as in a base station on ground. The results are displayed as maps of the anomalies of the Earth's magnetic total field.

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