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The rise of South Greenland 4D


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Fieldwork / Study

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Greenland, South-West
Fieldwork location

Geolocation is 60.137055, -45.2432978

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Science / project plan

Geological fieldwork was carried out in the the Søndre Sermilik and Tasermiut Fjords (SW Greenland) from the 17th of June to the 4th of July, 2016, as part of a 3 year PhD project that aims to establish a more detailed understanding of the tectono-metamorphic evolution of South Greenland and the geological relation to the Nalunaq Goldmine, and in turn to current knowledge of gold deposits worldwide. A major goal was to get a better structural and lithological perception on the geology and ore-forming processes of the Ketilidian Orogen.

The fieldwork was performed by using a former GGU boat (J.F. Johnstrup) to be sufficiently mobile and flexible regarding the weather and geographical distance to be able to cover a relatively large area of the fjords. From the boat we targeted accessible key geological locations, within the domain where the Julianehåb Igneous Complex (Central Domain) and the Supracrustal rock suit (Southern Domain) meet (Figure 1, red oval circle).

From the key locations, structural and petrographic information were collected along with a total of 99 rock samples. The rocks sampled are studied in detail to establish the petrology, elemental and isotope geochemistry and geochronology of the units from where the rocks were collected.  This data will provide a basis for a more detailed understanding of the regional geology of the study area and thus will add new information about the origin and evolution, and associated ore-forming processes of the Ketilidian Orogen.

The 2016 fieldwork emphasized on key locations along the shores of the fjords, thus the planned fieldwork for 2017 will focus on key locations further inland using helicopter as well as areas reachable by foot from a boat.