In the Precambrian Tartoq Group, SW Greenland, gold occurs in three parageneses associated with arsenopyrite-pyrite, tennantite and chalcopyrite. The gold-bearing sulphide mineralizations appear as conformable quartz layers, lenses and veins in greenstones of basaltic composition. Gold particles in the arsenopyrite-pyrite layers have a true fineness of c. 990, in the tennantite-rich veins a fineness of c. 720 and a fineness of c. 500 in the chalcopyrite quartz veins. The arsenopyrite-pyrite layers are of submarine exhalative origin, whereas the tennantite and the chalcopyrite quartz veins and lenses are of diagenetic and/or metamorphic origin.
- Received May 13, 1982.
- Revision received October 1, 1983.
- © Geological Society of London 1984