...Tom Andersen Abstract The Mesoproterozoic Qassiarsuk complex in the Gardar Rift in southwestern Greenland comprises lavas, pyroclastic rocks and subvolcanic intrusions of alkaline silicate rocks and carbonatites. The volcanic rocks are interlayered with sandstones and basalts belonging to the lower...

...Tom Andersen Abstract The Qassiarsuk (formerly spelled Qagssiarssuk) complex is located in a roughly E-W trending graben structure between Qassiarsuk village and Tasiusaq settlement in the northern part of the Precambrian Gardar rift, South Greenland. The complex comprises a sequence of alkaline...

... (Ilímaussaq and Igaliko complexes). Horizontal ruling – sandstones and volcanic rocks of the Eriksfjord Formation. Figure 2. Simplified stratigraphic columns of the Eriksfjord Formation at Qassiarsuk and Tasiusaq, from Andersen ( 2008 ). The question marks...

... Complex, as eruptive rocks and diatremes at Qassiarsuk, as a late plug associated with nepheline syenite at Grønnedal-Íka, and as small bodies associated with ultramafic lamprophyre dykes. The well-known cryolite deposit at Ivittuut was also rich in magmatic carbonate. The carbonatites are derived from...

...A. A. Finch; K. M. Goodenough; H. M. Salmon; T. Andersen Abstract North Motzfeldt is an intrusive igneous centre within the Igaliku (formerly spelt Igaliko) complex, Gardar Province, South Greenland. A detailed field description of the centre is given, with preliminary geochemical and isotopic data...

... complex with four intrusive centres of mostly syenites and nepheline syenites ( Emeleus & Harry 1970 ), and Paatusoq consisting mainly of syenite. The Qassiarsuk carbonatite ( Stewart 1970 ) includes pyroclastic rocks deposited together with rift sediments. The immediate exploration targets...

... extremely constructive and helpful reviews of an earlier version of the manuscript. S. Gibson also contributed many constructive comments. References Andersen , T. , 1997 . Age and petrogenesis of the Qassiarsuk carbonatite–alkaline silicate volcanic complex in the Gardar rift, South...

... unit precedes each volcanic group ( Thomas and Piper, 1992 ). The Mussartût Group contains the Qassiarsuk carbonatite complex, dated at ~1.2 Ga by Rb-Sr and Pb-Pb isochrons ( Andersen, 1997 ). Paslick et al. (1993) obtained two Sm-Nd isochron ages of 1.17±0.03 and 1.20±0.03 Ga for two samples...

... with rifting during the Mesoproterozoic and carbonatite formation is thought to share a cogenetic origin with lamprophyre occurrences in the area ( Blaxland et al., 1978 ; Coulson et al., 2003 ). Carbonatites from the Qassiarsuk carbonatite-alkaline silicate volcanic complex (61°N) are also associated...

... reviewer and by Dr D. Brown. The Carnegie Trust for the Universities of Scotland provided a grant for the production of the colour images. References ANDERSEN , T. 1997 . Age and petrogenesis of the Qassiarsuk carbonatite-alkaline silicate volcanic complex in the Gardar rift, South...