Generalised hydrogeological map of Lower Saxony, 1 : 200 000 - Base of the upper aquifer complex
(HUEK200BGWL)
The 'Base of the upper aquifer complex' map clarifies the large-scale distribution and depth (in metres NN) of the interregional important upper aquifer complex. The depth information is given more or less summarised, depending on the information density. If further subdivisions within a given colour zone are only possible with difficulty, the depth information appears as coloured lines in these areas.
All sands (down to the finest sand grade) and gravels with a silt or clay content less than 5% were classified as aquifers for this map. Thus, a very slightly silty fine sand is still classified as an aquifer based on the strata description, while a slightly silty fine sand is referred to as only slightly permeable.
In Lower Saxony's unconsolidated rock regions, two major, large-scale groundwater complexes are differentiated. The upper aquifer complex is composed of Pleistocene sands and gravels, and Pliocene and Upper Miocene sands. The lower aquifer complex comprises permeable Lower- to Mid-Miocene sediments, known as the Lignite Sands. The two aquifer complexes are separated by the Upper Mica Clay aquitard, consisting of silty-clayey, Mid- to Upper Miocene sediments. In those regions in which the isolating Upper Mica Clay layer (aquitard) is absent, generally only one - viewed on a large scale - aquifer complex exists. This is the case in the region of deeply incised channels, as well as greatly elevated salt domes. In the east of Lower Saxony the Upper Mica Clay has been largely eroded. In these regions, therefore, only one aquifer complex is shown in the map and labelled as the upper aquifer complex, even though the permeable lignite sand sediments, which otherwise form the lower aquifer complex, are allocated to it. The base of the upper aquifer complex is thus formed either by the Upper Mica Clay or, where this is absent, by Lower Miocene to Oligocene clays and silts.
Two areas are differentiated in the map's colour scale: 1. Regions in which the aquifer complex is undivided, because either the isolating mica clay layer is absent or no Lower Miocene aquifer has formed. 2. Regions in which the aquifer complex is subdivided, i.e. the Upper Mica Clay is widespread and separates an upper from a lower aquifer storey.
It is possible that other low-hydraulic conductivity sediments, such as Quaternary basin clays, may regionally assume the function of isolating layers, which then affect a spatially limited division of the aquifer complex into two or more aquifer storeys. However, the available data do not allow sufficient conclusions on the distribution of low-hydraulic conductivity Quaternary sediments to be drawn, because they are not constant over large areas in the way that the Mica Clay is. Instead, the facies may be highly variable over even very short distances. They are therefore not included in this generalised map, even though they are often very important for regional groundwater hydraulics. The thickness of the upper aquifer complex is shown in a separate map
Additional documents
Informations about data
- Editing state:
continuous updating (onGoing).
- Date of last publication:
07.05.2004
- Date of creation:
01.01.2001
- Information about data origin:
An Datengrundlagen sind eingegangen:
- Manuskriptkarten (KUSTER) 1 : 200 000 (LBEG)
- Bohrungen der Bohrdatenbank Niedersachsen
- Identifizierung des oberen Grundwasserleiter-Komplexes aus Sanden und Kiesen des Pleistozän sowie aus Sanden des Pliozän und des Obermiozän, GeoDin-Anwendung
- Identifizierung des unteren Grundwasserleiter-Komplexes aus durchlässigen Sedimenten des Unter- bis Mittelmiozän, den sog. Braunkohlensanden, GeoDin-Anwendung
- Identifizierung der Trennschicht zwischen den beiden Grundwasserleiter-Komplexen als Grundwasserhemmer Oberer Glimmerton, der aus schluffig-tonigen Sedimenten des Mittel- bis Obermiozän besteht, GeoDin-Anwendung
Je nach Informationsdichte werden die Angaben zur Tiefenlage mehr oder weniger stark zusammengefasst.
Contact person
Phone:
+49 (0)511-643-3613
Fax:
+49 (0)511-643-533613
Online access to data
To access the data online you can use the following applications/services:
Distribution information
Common informations (order proccess, product choise, prices):
NIBIS-Preisliste, AGB, Vergütungsverzeichnis für Leistungen des LBEG, Bestellhinweise (https://www.lbeg.niedersachsen.de/portal/live.php?navigation_id=613&article_id=905&_psmand=4); Produktkatalog des LBEG (https://www.lbeg.niedersachsen.de/download/1238)
Data formats
- ArcGIS-Shapefile
(
Version:
inapplicable)
- JPEG
(
Version:
inapplicable)
- PDF
(
Version:
inapplicable)
- TIFF
(
Version:
inapplicable)
Data medium
- Ausdruck (hardcopy)
- CD-ROM (cdRom)
- DVD (dvd)
Distribution contact
Phone:
+49 (0)511-643-3354
Fax:
+49 (0)511-643-533354
Additional information about the data
- Format of data:
digitale Karte in Raster- oder Vektorform (mapDigital)
- Topic:
Geowissenschaften
(geoscientificInformation)
- Key words:
inspireidentifiziert, sgd_Hydrogeologie, NIBIS-Metadaten
- Key words GEMET:
Geology
- Thesaurus name:
GEMET - INSPIRE themes, version 1.0
- Thesaurus date of puplication:
2008-06-01
- Geometry type:
Fläche (surface)
- Scale:
1:200000
- Coordinate system:
4647; ETRS89 / UTM zone 32N (zE-N)
(Europäisches Terrestrisches Referenzsystem von 1989 / Universale Transversale Mercatorabbildung Zone 32N)
- Altitude reference system:
DE_DHHN92_NH
- Reference layer:
Datenbestand (dataset )
- Language:
ger
- Character set:
utf8
Access- and security restrictions
- Security classification:
unbeschränkt (unclassified)
- Access restriction:
Urheberrecht (copyright)
- Restriction of application:
Allgemeine Geschäftsbedingungen -AGB- des Landesamtes für Bergbau, Energie und Geologie (LBEG) und die Anlage Vergütungsverzeichnis für Leistungen des LBEG
Information about content (auto detected)
- Amount datasets/features:
851
- Spacial notation:
vector
- Eastern longitude:
6.5475
to
11.7416
- Northern latitude:
51.225
to
53.9343
About this data description
- Metadata standard:
Standard
ISO 19115
,
version
ISO 19115:2003/Cor. 1:2006 (E)
- Metadata status:
05.09.2022
- Metadata language:
ger
- Metadata character code:
utf8
Metadata contact