Mesoarchean epithermal gold mineralization preserved at upper amphibolite-facies grade, Qussuk, southern west Greenland / Adam A. Garde in Economic geology, Vol. 107 N° 5 (Août 2012)  

Public ISBD [article]  inEconomic geology > Vol. 107 N° 5 (Août 2012) . - pp. 881-908 Titre : Mesoarchean epithermal gold mineralization preserved at upper amphibolite-facies grade, Qussuk, southern west Greenland Type de document : texte imprimé Auteurs : Adam A. Garde, Auteur ; Martin Whitehouse, Auteur ; Rasmus Christensen, Auteur Année de publication : 2012 Article en page(s) : pp. 881-908 Note générale : Economic geology Langues : Anglais (eng) Mots-clés : Gold deposits  mineraliation  upper amphibolite metamorphic conditions  Greenland Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : The Qussuk gold occurrence, located in southern West Greenland (North Atlantic Craton), is a flattened, transposed, and metamorphosed, 20 km long Au ± Cu system interpreted as an epithermal mineralization system of Mesoarchean age. The Qussuk mineralization is hosted in the 3.075 Ga volcanosedimentary rocks of a relict andesitic arc. The volcanic arc component is embedded in 3.06 to 3.0 Ga plutonic, predominantly tonalitic rocks and was gradually deformed and metamorphosed as the original arc matured into a microcontinent. Metamorphism culminated with a sillimanite-grade amphibolites-facies thermal event and mobilization of granite at around 2.995 to 2.975 Ga. The premetamorphic hydrothermal alteration associated with the mineralization includes acid leaching revealed by quartz-alumina rocks with very high rare earth element (REE) contents and Ga-Al fractionation, and subsequent reintroduction of LIL elements including K, Th, and U together with the mineralizing agents. Premetamorphic carbonate alteration is widespread but unrelated to the mineralized system. Complexly zoned zircon with igneous-hydrothermal-metamorphic histories and metamorphic monazite bracket the mineralizing event to 3.075 to 3.02 Ga (most likely >3.06 Ga) in age. The zoned zircons have volcanic/igneous, 3.075 Ga oscillatory zoned cores with igneous-type REE distributions, DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/107/5/881.short [article] Mesoarchean epithermal gold mineralization preserved at upper amphibolite-facies grade, Qussuk, southern west Greenland [texte imprimé] / Adam A. Garde, Auteur ; Martin Whitehouse, Auteur ; Rasmus Christensen, Auteur . - 2012 . - pp. 881-908. Economic geology Langues : Anglais (eng) in Economic geology > Vol. 107 N° 5 (Août 2012) . - pp. 881-908 Mots-clés : Gold deposits  mineraliation  upper amphibolite metamorphic conditions  Greenland Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : The Qussuk gold occurrence, located in southern West Greenland (North Atlantic Craton), is a flattened, transposed, and metamorphosed, 20 km long Au ± Cu system interpreted as an epithermal mineralization system of Mesoarchean age. The Qussuk mineralization is hosted in the 3.075 Ga volcanosedimentary rocks of a relict andesitic arc. The volcanic arc component is embedded in 3.06 to 3.0 Ga plutonic, predominantly tonalitic rocks and was gradually deformed and metamorphosed as the original arc matured into a microcontinent. Metamorphism culminated with a sillimanite-grade amphibolites-facies thermal event and mobilization of granite at around 2.995 to 2.975 Ga. The premetamorphic hydrothermal alteration associated with the mineralization includes acid leaching revealed by quartz-alumina rocks with very high rare earth element (REE) contents and Ga-Al fractionation, and subsequent reintroduction of LIL elements including K, Th, and U together with the mineralizing agents. Premetamorphic carbonate alteration is widespread but unrelated to the mineralized system. Complexly zoned zircon with igneous-hydrothermal-metamorphic histories and metamorphic monazite bracket the mineralizing event to 3.075 to 3.02 Ga (most likely >3.06 Ga) in age. The zoned zircons have volcanic/igneous, 3.075 Ga oscillatory zoned cores with igneous-type REE distributions, DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/107/5/881.short

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