The mineral resource potential of the Nordre Strømfjord – Qasigiannguit region, southern and central West Greenland

Stendal, Henrik; Blomsterberg, Jette; Jensen, Sven; Lind, Mogens; Madsen, Heine Buus; Nielsen, Bo Møller; Thorning, L; Østergaard, Claus

doi:10.34194/ggub.v191.5112

Cited by 7 publications

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“…above one gramme per ton, 1 ppm) have been identified during commercial and government exploration in the study region, although none have so far proved economic in size and grade ( Fig. 1; Stendal 1998;Stendal et al 2002;Stendal & Schønwandt 2003). The known auriferous mineral occurrences are all hosted in Archaean rocks.…”

Section: Known Gold Occurrencesmentioning

confidence: 97%

Gold in central West Greenland – known and prospective occurrences

et al. 2004

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In 2003, the Geological Survey of Denmark and Greenland (GEUS) completed a four-year project aimed at assessing the mineral potential of the Precambrian region of West Greenland between latitudes 66° and 70°15´N. The project was part of a contract between GEUS and the Ministry of the Environment, and involved compilation of existing geoscientific data, new geological mapping, field examinations of known and potential mineral occurrences, new chemical and isotope analyses, and data interpretation. The data compilation, available on a DVD (Schjøth et al. 2004), comprises regional, systematically acquired data sets presented in a Geographic Information System environment. Aeromagnetic, aeroradiometric, stream sediment and rock geochemical and gravity data, a digital elevation model and a satellite image are included, plus descriptions of 60 mineral occurrences. Evaluation of the mineral potential is based on interpretations of the compiled information as well as on earlier investigations by the Survey, the University of Copenhagen and commercial companies (see e.g. Stendal & Schønwandt 2003; Stendal et al. 2004). From an economic point of view, the potential for gold and diamonds is the most interesting in the investigated area. This paper summarises the evaluation of the gold potential; results of diamond-related investigations are reported separately (Jensen & Secher 2004, this volume).

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Section: Known Gold Occurrencesmentioning

confidence: 97%

Gold in central West Greenland – known and prospective occurrences

et al. 2004

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“…Several distinct NNE-trending fault zones occur in the area between Kuup Akua and Ussuit (Stendal et al 2002). Sinistral displacement of several kilometres can be deduced for many of the faults from mapping and aeromagnetic data (Nielsen 2004;Nielsen & Rasmussen 2004).…”

Section: Metalliferous Mineralsmentioning

confidence: 99%

Explanatory notes to the Geological Map of Greenland, 1:100 000, Ussuit 67 V.2 Nord

Gool

Marker

2007

geusm

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NOTE: This Map Description was published in a former series of GEUS Bulletin. Please use the original series name when citing this series, for example: van Gool, J. A., & Marker, M. (2007). Explanatory notes to the Geological Map of Greenland, 1:100 000, Ussuit 67 V.2 Nord. Geological Survey of Denmark and Greenland Map Series 3, 1-40. https://doi.org/10.34194/geusm.v3.4596 _______________ The Ussuit map area is situated around the inner Nassuttooq (Nordre Strømfjord) in central West Greenland, in the core of the Palaeoproterozoic Nagssugtoqidian orogen. The orogen largely consists of reworked Archaean gneisses, as well as Palaeoproterozoic ortho- and paragneisses in its central part. Easy access through the branched fjord system and good exposures along its coastlines, combined with less intense reworking compared to neighbouring areas to the west and south, have made the Ussuit map area the most intensely studied and best known part of the orogen. The most recent research and mapping projects were organised by the Danish Lithosphere Centre (1994–1999) and the Geological Survey of Denmark and Greenland (2000–2001). The predominant rocks are late Archaean tonalitic and granodioritic orthogneisses, intruded by postkinematic granites. Archaean supracrustal rocks are predominantly of mafic composition, but only few have been recognised. Palaeoproterozoic rocks occur as tectonic sheets (the Ussuit unit) which are always in tectonic contact with the Archaean orthogneisses. The most abundant Palaeoproterozoic rock types are biotite schist and biotite-bearing paragneiss, besides orthogneiss of the Arfersiorfik intrusive suite. The latter rocks are mainly deformed quartz diorites intrusive into the metasedimentary rocks and interpreted as remnants of a magmatic arc above a subduction zone. The Ussuit unit also includes amphibolite, marble and calc-silicate rocks, and lenses of ultrabasic rocks. Small bodies of younger syn- and post-tectonic granites occur throughout the map area. The interleaved Palaeoproterozoic and Archaean rocks form a major anticlinal fold structure between two crustal-scale shear zones, the Nordre Strømfjord shear zone in the north and the Nordre Isortoq steep belt in the south. These shear zones formed during the latest ductiledeformation event (D4), following ductile thrusting (D1) and kilometre-scale folding (D2 and D3). The deformation and high grade metamorphism are the result of collision of two Archaean blocks at c. 1850 Ma, with a presumed strongly deformed suture rooted in the southern Ussuit area. No economically feasible mineral occurrences have been discovered to date within the Ussuit map area. Minor sulphide mineralisation related to hydrothermal activity occurs in faults and shear zones, and minor stratabound iron formations have been observed. The most promising industrial mineral deposits are minor diopside occurrences and potential dimension stone in migmatised orthogneiss.

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“…4) is invaded by pegmatite sheets as well as centimetre-wide veins consisting of red alkali-feldspar and quartz with occasional pyrite and magnetite. The estimated relative volume of pegmatite in the tract varies from 1 to 10% (Stendal et al 2002(Stendal et al , 2004. The most promising gold showings are found in a coastal profile along the shear/mylonite zone, which can be followed along strike for several hundreds of metres (Figs 1, 2).…”

Section: The Attu Gold Prospectmentioning

confidence: 99%

“…Discovery of the gold prospect described in this study was due to the find of a mineralised sample, which Karl Markussen from Attu submitted to the Bureau of Minerals and Petroleum in Greenland. The Geological Survey of Denmark and Greenland (GEUS) visited the locality in 2001 and in 2002 (Stendal et al 2002(Stendal et al , 2004, and the present paper reports Pb-isotopic data for minerals from the prospect and its surroundings.…”

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confidence: 92%

A lead isotope study of an Archaean gold prospect in the Attu region, Nagssugtoqidian orogen, West Greenland

Stendal

Stensgaard

2006

GEUS Bulletin

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This paper presents a lead isotope investigation of a gold prospect south of the village Attu in the northern part of the Nagssugtoqidian orogen in central West Greenland. The Attu gold prospect is a replacement gold occurrence, related to a shear/mylonite zone along a contact between orthogneiss and amphibolite within the Nagssugtoqidian orogenic belt. The mineral occurrence is small, less than 0.5 m wide, and can be followed along strike for several hundred metres. The mineral assemblage is pyrite, chalcopyrite, magnetite and gold. The host rocks to the gold prospect are granulite facies ‘brown gneisses’ and amphibolites. Pb-isotopic data on magnetite from the host rocks yield an isochron in a 207Pb/204Pb vs. 206Pb/204Pb diagram, giving a date of 3162 ± 43 Ma (MSWD = 0.5). This date is interpreted to represent the age of the rocks in question, and is older than dates obtained from rocks elsewhere within the Nagssugtoqidian orogen. Pb-isotopic data on cataclastic magnetite from the shear zone lie close to this isochron, indicating a similar origin. The Pb-isotopic compositions of the ore minerals are similar to those previously obtained from the close-by ~2650 Ma Rifkol granite, and suggest a genetic link between the emplacement of this granite and the formation of the ore minerals in the shear/mylonite zone. Consequently, the age of the gold mineralisation is interpreted to be late Archaean.

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The mineral resource potential of the Nordre Strømfjord – Qasigiannguit region, southern and central West Greenland

Cited by 7 publications

References 0 publications

Gold in central West Greenland – known and prospective occurrences

Gold in central West Greenland – known and prospective occurrences

Explanatory notes to the Geological Map of Greenland, 1:100 000, Ussuit 67 V.2 Nord

A lead isotope study of an Archaean gold prospect in the Attu region, Nagssugtoqidian orogen, West Greenland

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