Supracrustal of pre-Ketilidian age (the Tartoq Group) and their relationship with Ketilidian supracrustals in the Ivigtut region, South-West Greenland

Higgins, A.K; Bondesen, E

doi:10.34194/rapggu.v8.7133

Cited by 6 publications

(2 citation statements)

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“…A major supracrustal unit, the Tartoq Group at Sermiligaarsuk, comprises a several kilometre thick succession of strongly deformed mafic metavolcanic and felsic metasedimentary rocks at greenschist-to low amphibolitefacies metamorphic grade. 20,21 A minimum age for the Tartoq Group is set by the 2940-m.y. age of a granitic body that intrudes the group.…”

Section: Archaean Domainmentioning

confidence: 99%

Geochemical signatures of gold provinces in South Greenland

Steenfelt¹

2000

Applied Earth Science

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Section: Archaean Domainmentioning

confidence: 99%

Geochemical signatures of gold provinces in South Greenland

Steenfelt¹

2000

Applied Earth Science

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“…In the Foreland the Tartoq greenstone belt overlies the Archaean gneisses. The Tartoq Group 4,19,20 comprises several greenstone occurrences along the north and south sides of the fjord (Fig. 1).…”

Section: Gold In the Archaean-palaeoproterozoic Border Zonementioning

confidence: 99%

Gold occurrences and lead isotopes in Ketilidian Mobile Belt, South Greenland

Stendal¹

2000

Applied Earth Science

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at the edge of the Julianehåb batholith. The emplacement of the juvenile I-type Julianehåb batholith lasted from 1850 to 1800 m.y. with late-stage intrusions until 1770 m.y. Emplacement of the gold mineralization is considered to have taken place in the late stage of formation of the batholith (1800-1770 m.y.) and during the regional deformation and metamorphism before the intrusion of rapakivi granites. Local remobilization of metals, however, was caused by hydrothermal activity around some rapakivi granitoids. In essence, therefore, gold deposition in South Greenland is restricted to a quite narrow time interval. Lead isotopes from different occurrences in South Greenland indicate two main stages of gold emplacement. The first was related to the Palaeoproterozoic regional deformation and metamorphism (1792-1785 m.y.), during which sediment-hosted gold was epigenetically remobilized into shear zones and vein systems. Pb in these occurrences is indicative of a ca 2000-m.y. source, which is compatible with the direct basic host rocks to these occurrences. The second stage of gold deposition appears to have been temporally related to late stages of emplacement of the Julianehåb batholith. The source of the slightly more evolved Pb in these occurrences is difficult to assess, but a mixture of juvenile Pb from the batholith with some contributions from the host rocks may explain the scatter of data around a 1780-m.y. reference line. Gold occurrences have been found in the PalaeoproterozoicKetilidian Mobile Belt within the last ten years. This is due to the fact that the analytical methods used in the 1970s and 1980s did not include gold analyses as the commodities of interest at that time were U, Nb, Ta, Zr and rare-earth elements in the South Greenland uranium province. 2,3,24,29,43 At the beginning of the 1990s companies became interested in the gold potential of South Greenland. Nunaoil A/S carried out a gold exploration programme in the region, 30 which was followed by the SUPRASYD programme of the Geological Survey of Denmark and Greenland. 38 The results, with discoveries such as Nalunaq 15,32 and Kangerluluk,35 were impressive. The Nalunaq deposit has been through a feasibility study and Crew Development Corporation has announced the start of gold production from Nalunaq within two years.*The study reported here was undertaken with the objectives of characterizing the geological setting of the gold mineralization and the Pb-Pb isotope signature of these occurrences and suggesting the possible source rock of the gold and age of the gold formation.

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