Abstract
In 2004 the Geological Survey of Denmark and Greenland (GEUS) initiated a study of the origin and tectono-metamorphic evolution of greenstone belts and important regional structures in the central Godthåbsfjord region, southern West Greenland (Fig. 1; Hollis et al. 2004). Like other Archaean belts worldwide, these greenstone belts are locally host to gold mineralisation. Their complexity requires a combination of detailed geological mapping, geochemistry, petrographic work and geochronological studies to develop models of their geological setting, evolution and gold mineralisation.
Highlights
In 2004 the Geological Survey of Denmark and Greenland (GEUS) initiated a study of the origin and tectono-metamorphic evolution of greenstone belts and important regional structures in the central Godthåbsfjord region, southern West Greenland (Fig. 1; Hollis et al 2004)
The 2826–2750 Ma Tre Brødre terrane, which is in tectonic contact with the Færingehavn terrane in many parts of the central Godthåbsfjord region, and with the Akia terrane (Fig. 1), is dominated by late Archaean (c. 2825 Ma) orthogneiss, and includes metasedimentary and mafic volcanic rocks and gabbro-anorthosite
Three distinct NNE–SSW-trending greenstone belts can be recognised in the central Godthåbsfjord region: the Storø, Bjørneøen and Qussuk greenstone belts (Fig. 1)
Summary
The greenstone belts in the Godthåbsfjord region represent remnants of Archaean intrusive and extrusive mafic rocks, and minor chemical and clastic sediments. These were once thought to be dismembered parts of the same greenstone belt, but are known to belong to unrelated groups of different ages, occurring within several distinct continental crustal terranes – the Færingehavn, Akia and Tre Brødre terranes
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