Geoscientific maps Greenland
Geologists in the field in Greenland.
Geoscientific maps constitute an important element of the work GEUS performs in Greenland. This work includes geological and geophysical mapping; i.e. fundamental sources for understanding the structure of the Earth's crust and the processes that have led to the formation of naturally occurring mineral resources.
GEUS’ activities in brief
Geological mapping in Greenland has been a core activity for GEUS and the former GGU (Geological Survey of Greenland) for many years, and the geological mapping is still going on. The survey started more than 100 years ago, but systematic mapping of Greenland started in the 1960s, and the published geological map includes map sheets in scale 1:100 000, 1:250 000, 1:500 000, 1:1 000 000 and 1:2 500 000. Read more about the national map coverage of Greenland (LINK).
The GIS group at GEUS converts the existing maps into digital format and makes the maps available through the internet. In 2013 a web-based geological map of entire Greenland on a scale of 1:500 000 was published. The map is based on information from 14 existing maps on the same scale and is equipped with a geological legend. The map is described in the article: A new seamless digital 1:500 000 scale geological map of Greenland (opens as PDF) in the series: Geological Survey of Denmark and Greenland Bulletin and in the GEUS factsheet: Seamless Geological Map of Greenland – Scale 1:500000 (opens as PDF).
A geological map of south-western Greenland (latitude 64°–61°30'N) in scale 1:100 000 was published in 2011 as a web-based map service. The map covers the Archaean bedrock that exists between Ameralik and Sermiligaarsuk fjords and represents a new compilation of the existing maps on a scale of 1:100 000. The map contains information about a range of geological topics arranged as interactive layers, including information on sample locations, age dating, rock types, geological and geophysical data.
Since the early 1970s, several geophysical surveys have been conducted in Greenland from aircraft as part of a targeted approach by public authorities. The purpose of the studies is to stimulate the mineral resource exploration activities in Greenland. The surveys also contribute to the understanding of the geological conditions and thus contribute to the overall mapping of Greenland’s geology. This mapping is performed in a collaboration between GEUS and the Greenland Government.
The geophysical survey includes measurements of the Earth’s natural magnetic field and measurements of the Earth’s electrical properties. In selected areas, the natural radioactive radiation is also measured. The measured geophysical parameters reflect the geology of the rocks. Detailed information about high-resolution geophysical surveys in Greenland can be downloaded via Greenland Mineral Resources Portal. The geophysical surveys are described in Geology & Ore No. 22 (opens as PDF).
Structural geology and 3D photo geology
GEUS’ structural geology group is working with the spatial structure of rocks and their deformation history. For this purpose, GEUS has built a Photogrammetric Laboratory carrying out detailed mapping of geological structures in 3D from oblique and aerial photographs.