...Minik T. Rosing; Dennis K. Bird; Robert F. Dymek Abstract Thermodynamic analysis of phase relations in a high-grade gneissic xenolith from the anatectic region of the late Archean Qôrqut Granite Complex indicates that fluids, probably derived from the granite complex, caused partial replacement...

.... and 3.2 b.y. respectively (Black et al. 1971). The granite complex gives an age around 2.6 b.y. (unpublished age quoted in Black et al. 1973), i.e. within the range quoted by Allen et al. for the Torridonian pebbles. The erosion of the roof zones of granites such as the Qorqut at or near the present level...

... disturbance pattern. Zircons from the Nulliak assemblage (WGC = Isua supracrustals and Akilia association, > 3800 Ma) give dates of ~2500 Ma and have been completely reset by thermal metamorphism accompanying the intrusion of post-tectonic granites at ~2520 Ma (WGC = Qôrqut granite 2520 Ma). A group...

... intrusions magmas shape fractals References Brown M. Friend C.R.L. McGregor V.R. Perkins W. T. Then Late Archean Qorqut granite complex of southern west Greenland Journal of Geophysical Research 1981 86 10,617 10,632 Clark M.B. Brantley S.L. Fisher D.M...

.... 2017 ). This part of the North Atlantic Craton contains a complex mixture of Eoarchean and Paleoarchean terranes, and Mesoarchean arc assemblages, and has many similarities in timing and composition to the gneisses of the Saglek Block. The extensive c. 2560 Ma Qôrqut Granite Complex that intrudes...

... (Malene supracrustals) and an anorthosite complex (Friend et al. 1987 ; Nutman et al. 1989 ; McGregor 1993 ). The Akulleq terrane was intruded by the K-rich Qôrqut postorogenic granite at about 2550 Ma and stabilized at that time (Baadsgaard 1976 ; Brown et al. 1981 ; Moorbath et al. 1981 ; McGregor...

... Friend, C. R. L., Brown, M., Perkins, W. T. & Burwell, A. D. M. 1985. The geology of the Qôrqut granite complex north of Qôrqut, Godthåbsfjord, southern West Greenland. Bulletin Grønlands Geologiske Undersøgelse 115 . Griffin W. L. McGregor V. R. Nutman A. P. Taylor P. N...

... in quartz segregations have been found along the margins of pegmatites in Malene supracrustal sillimanite gneisses and amphibolites. The pegmatites are associated with the roof zone of the Qorqut granite, which is a high level sheeted complex. The Qorqut granite intrudes amphibolite facies gneisses...

... ( Nutman & Friend 2007 ). The last significant event in the region was intrusion of the extensive c . 2.55 Ga ( Baadsgaard 1976 ) Qôrqut granite (Fig. 1 a). This event is represented on Akilia by abundant, centimetre- to metre-scale granite and pegmatite veins and associated alteration of adjacent...

... of the Qorqut granite complex north of Qorqut, Godthabsfjord, southern West Green· land. Bull. Gronlands Geol. Unders. IRVINE, T. N., (1982) Terminology for layered intrusions. Jour, Petrol., v. 23, pp. 127·162. KIRKPATRICK, R. J., (1975) Crystal growth from the melt: a review. Amer. Mineral.. v. 60, pp. 789...

... Grønlands geologiske Undersøgelse 1988 140 59 64 Friend C. R. L. Brown M. Perkins W. T. Burwell A. D. M. The geology of the Qôrqut granite complex north of Qôrqut, Godthåbsfjord, southern West Greenland Bulletin Grønlands geologiske Undersøgelse 1985 151 Friend C. R. L...

... sialic crustal source. INTRODUCTION The Archaean Granite Complex of the Medak area in the northwestern segment of Andhra Pradesh (Fig. 1A) forms a part of the granodiorite~adamel1ite­ granite (s .salkali feldspar granite dominated terrain of the Southern Indian Craton. The Granite Complex (referred...

... of the late Archaean Qorqut Granite Complex of southern West Greenland. Geochim. Cosmochim. Acta, v. 45, pp. 1051-1060. NAQVI, S. M., (1981) The oldest supracrustals of the Dharwar Craton, India. Jour. Geol Soc. India, v. 22, pp. 458-469. O'CONNOR, J. T., (1965) A classsification of quartz-rich igneous rocks...

... ages occurred at around 2.55 to 2.5 Ga ( Garde et al., 1986 ; Garde, 1997 , 2007a ), probably related to the emplacement of the ~2.5 Ga Qôrqut granite complex ( Brown et al., 1981 ). Rift-related mafic dike swarms were emplaced into the North Atlantic Craton at around 2.05 Ga ( Connelly et al...

.... To the east, up to the contact of the Neoarchean Qôrqut Granite Complex ( fig. 1 ), these gneisses contain lenses of quartz  +  magnetite BIF and variegated amphibolite-ultramafic rocks. The BIF units are up to 5 m across, whereas the mafic-ultramafic units are up to 500 m across and up to 1 km long...

... – 572 . Nutman A.P. Friend C.R.L. Hiess J. ( 2010 ) Setting of the ~2560 Ma Qôrqut granite complex in the Archean crustal evolution of southern West Greenland . American Journal of Science , 310 , 1081 – 1114 . Næraa T. Scherstén A. ( 2008 ) New zircon ages...

... series of ARCHAEAN STRATIGRAPHY AND STRUCTURE, SW GREENLAND 641 Table 1. Summary of the chronology of the Ivisrirtoq region and correlation with the Archaean of Godthiibsjjord and adjacent areas EARLY PROTEROZOIC DOLERITE AND ACID % KES QORQUT GRANITE COMPLEX (Ivislrtoq: Rb-Sr, 6-point isochron: 2430 f...

... . Setting of the ∼2560 Ma Qôrqut Granite complex in the Archean crustal evolution of southern west Greenland . American Journal of Science , 310 , 1081 – 1114 . Oliver , G.J.H. , Chen , F. , Buchwaldt , R. & Hegner , E. 2000 . Fast tectonometamorphism and exhumation...

.... This indicates that the corundums formed at a temperature in excess of 620 °C. In a corundum-bearing xenolith from the Qôrqut Granite Complex, Godthåbsfjord, Greenland, Rosing et al . (1987) found plagioclase and corundum to react with water to form margarite at ∼5 kbar and ∼580 °C. Margarite from the current...

... granitic plutons ( Fig. 2 ), most of which are known or inferred to be late Palaeozoic (i.e. Alleghanian). The field site is located near the eastern edge of the terrane, ~1 km from the southern margin of the Alberta pluton, and ~2 km west of a portion of the Macon fault zone ( Fig. 2 ). The ultramafic...