• Geus Geonetworks metadata catalogue
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Element distribution maps of stream sediments samples from the geochemical atlas of West and South Greenland

Each map displays a grid image of the variation in element concentration, a colour scale giving class intervals for the grid colours, histograms showing the frequency distributions of sample values and grid cell values, respectively, and statistical parameters for measured concentrations in samples and for the grid cell values. All element concentrations below the lower limit of detection for the analytical method have been set to zero for simplicity, and in accordance with their registration in the GEUS database. Major element oxide concentrations have been recalculated as volatile-free concentrations to compensate for the effect of variable contents of organic matter and carbonate.

Simple

Date (Revision)
2022-01-01
Identifier
dk.geus: / element_maps_2001r46
Presentation form
Digital map
Purpose

Stream sediment chemistry reflects chemical variations in rock complexes, and many element distribution patterns can be related to known lithological features. Although the rock exposure rate is generally very high in Greenland, there are inland areas in West Greenland where overburden and vegetation create problems for geological mapping. The geochemical maps helps to outline rock boundaries in such a surface environment. Also where high-grade metamorphism has obscured original textures and boundaries between lithological units, the geochemical maps may contribute valuable information. This is the case in central West Greenland where high-grade Archaean and Palaeoproterozoic gneiss complexes cannot be distinguished in the field. However, the younger gneiss has a strong geochemical signature, which is reflected in the maps of Ba and Sr. Thus an approximate outline of the younger gneiss can be drawn, based on the geochemical data. Several other cases are known from West and South Greenland, where stream sediment geochemical patterns have drawn the attention to rock complexes that had not previously been recognised.

The geochemistry of a rock unit, and its trace element signature, in particular, is an important factor in determining its origin. Many trace elements are hosted in scarce, fine-grained minerals in the rocks, e.g. apatite, zircon and monazite. These minerals are resistant to weathering with the effect that their abundance is upgraded in the stream sediments relative to their abundance in the source rocks. Again, because the stream sediment data cover regions with little or no geochemical data on rocks, the stream sediment chemical maps may assist in identifying rock complexes of a certain origin.

Status
Completed
Point of contact
  Geological Survey of Denmark and Greenland (GEUS) -
Oster Voldgade 10 , Copenhagen , 1350 K , Denmark
Maintenance and update frequency
As needed
GEMET - INSPIRE themes, version 1.0
  • Geology
  • Mineral resources
Keywords
Access constraints
Copyright
Use constraints
Copyright
Other constraints
No limitations on public access
Other constraints
Conditions for Re-use of data http://pubs.geus.net/et_dokument
Spatial representation type
Vector
Spatial representation type
Grid
Denominator
-1
Distance
5000  m
Metadata language
English
Topic category
  • Geoscientific information
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Reference system identifier
EPSG / https://epsg.io/32624
Geometric object type
Surface
Distribution format
  • geotiff files ( 0.1 )

Point of contact
  Geological Survey of Denmark and Greenland (GEUS) -
Oster Voldgade 10 , Copenhagen , 1350 K , Denmark
OnLine resource
Publication ( WWW:LINK-1.0-http--link )

A. Steenfelt 2001 Geochemical atlas of Greenland - West and South Greenland. [2 versions: Printed maps included or 1 CD-Rom included] Danmarks og Grønlands Geologiske Undersøgelse Rapport 2001/46.

OnLine resource
WMS ( OGC:WMS-1.3.0-http-get-capabilities )

ElementMaps2001R46

OnLine resource
Interactive map ( WWW:LINK-1.0-http--link )
Hierarchy level
Dataset

Conformance result

Date (Publication)
2010-12-08
Explanation
This field has no significance
Pass
No
Statement
Data are based on https://data.geus.dk/geonetwork/srv/eng/catalog.search#/metadata/8abf8aef-e244-4f70-9c48-a455cf4c32ae
File identifier
05ba12b3-f40b-4832-9765-16d8ebb745c2 XML
Metadata language
English
Hierarchy level
Dataset
Date stamp
2023-05-10T11:28:01
Metadata standard name
ISO 19115:2003 / ISO 19139:2007
Point of contact
  Geological Survey of Denmark and Greenland (GEUS) -
Oster Voldgade 10 , Copenhagen , 1350 K , Denmark
 
 

Overviews

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Spatial extent

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W
thumbnail


Keywords


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