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Copyright (c) 2026 Valdemar Oksfeldt Enevoldsen, Thomas Find Kokfelt, Andrew J. Locock, Trine Ravn-Jonsen, Kristine Thrane, Tod Waight, James M. Scott
This work is licensed under a Creative Commons Attribution 4.0 International License.
Abstract
Anthophyllite- and garnet-bearing metapelites from the Nunatarsuaq domain, located north of the UNESCO World Heritage site Ilulissat Icefjord (Kangiata Sullua) in Greenland at the northern margin of the Nagssugtoqidian orogen, enable a first quantitative assessment of the conditions of metamorphism in the area. Geothermobarometry undertaken on metapelites from a representative section of the domain indicates peak metamorphic conditions of c. 700–750°C and c. 8–9.5 kbar implying burial to mid–lower-crustal depths during deformation. The high-temperature range is consistent with the occurrence of widespread textural evidence for partial melting in the rocks. Retrograde chlorite, epidote and actinolite along with reverse zoning of Mn in garnet rims record subsequent cooling and hydration during exhumation into lower amphibolite to greenschist facies conditions, although the timing is unclear. The recognition of upper-amphibolite facies metamorphic conditions indicates that the Nunatarsuaq domain likely shared a common Palaeoproterozoic 1.82–1.81 Ga metamorphic event, probably associated with crustal thickening during collision of the Rae and North Atlantic cratons in the Nagssugtoqidian orogen. These findings reveal that the Nunatarsuaq domain preserves a higher-grade metamorphic imprint than previously recognised and refine the metamorphic architecture of the northern Nagssugtoqidian orogen.
How to Cite
Share
Copyright (c) 2026 Valdemar Oksfeldt Enevoldsen, Thomas Find Kokfelt, Andrew J. Locock, Trine Ravn-Jonsen, Kristine Thrane, Tod Waight, James M. Scott
This work is licensed under a Creative Commons Attribution 4.0 International License.
Data Availability Statement
Two additional files are available as supplementary information. SEM and EPMA data are available, sorted by sample, in an accompanying Excel file Supplementary File S1.xlsx. Precision of standards are available in Supplementary File S2.xlsx.
Supplementary Files
Funding
This study was supported by the Geological Survey of Denmark and Greenland (GEUS) and Ministry of Mineral Resources, Government of Greenland, as well as the Institut for Geoscience, Aarhus University, Denmark.Downloads
An annual collection of articles submitted to GEUS Bulletin and published throughout 2026. Published online only. This issue is open for submissions until the end of 2026.
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