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TitreNew U-Pb (zircon and monazite) ages and Sm-Nd isotopic data from granitoid plutons in the Aspy and Bras d'Or terranes of Cape Breton Island, Nova Scotia: implications for tectonic evolution and mineralization potential
TéléchargerTéléchargement (publication entière)
Auteurvan Rooyen, D; Barr, S M; White, C E
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 1; par Rogers, N (éd.); Commission géologique du Canada, Dossier public 8358, 2018 p. 37-45, https://doi.org/10.4095/306404
Année2018
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/306404
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans Rogers, N; (2018). Targeted Geoscience Initiative: 2017 report of activities, volume 1, Commission géologique du Canada, Dossier public 8358
Formatspdf
ProvinceNouvelle-Écosse
SNRC11F/09; 11F/10; 11F/11; 11F/14; 11F/15; 11F/16; 11G/13; 11J/04; 11J/05; 11K; 11N/01; 11N/02
Lat/Long OENS -61.5000 -59.5000 47.2500 45.5000
Sujetsgisements minéraux; prospection minière; potentiel minier; gisements porphyriques; genèse des minerais; contrôles des minerais; minéralisation; analyses des roches totales; etudes isotopiques; néodyme; datation radiométrique; datation au uranium-plomb; zircon; monazite; évolution tectonique; cadre tectonique; magmatisme; intrusions; plutons; filons rocheux; filons-couches; géologie du substratum rocheux; lithologie; roches ignées; roches plutoniques; roches granitiques; granodiorites; diorites; granites; monzogranites; roches volcaniques; andésites; dacites; tufs volcaniques; roches métamorphiques; orthogneiss; roches hôtes; géologie du socle; Ganderie; Terrane d'Aspy ; Orogène Appalachien; Formation de Price Point ; Pluton de Margaree ; Avalonie; Terrane de Mira ; Pluton de Gillanders Mountain ; Suite Métamorphique de Jumping Brook ; géologie économique; tectonique; géochronologie; Phanérozoïque; Paléozoïque; Dévonien; Silurien; Ordovicien; Cambrien; Précambrien; Protérozoïque
Illustrationsgeoscientific sketch maps; tables; plots
Consultation
Endroit
 
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
 
ProgrammeGestion de la connaissance de IGC, Initiative géoscientifique ciblée (IGC-5)
ProgrammeSystèmes porphyriques, Initiative géoscientifique ciblée (IGC-5)
Diffusé2018 01 19
Résumé(disponible en anglais seulement)
Granitoid plutons are widespread in the Ganderian Aspy and Bras d'Or terranes of Cape Breton Island and are diverse in composition, isotopic characteristics, and tectonic affinity. This study presents new U-Pb zircon ages from 10 previously undated plutons or their host rocks in the two terranes. The results range from Neoproterozoic (ca. 575 and 560 Ma in the Big Hill granodiorite and Price Point Formation), through Cambrian (ca. 515 and 510 Ma in Kellys Mountain diorite and granodiorite), Silurian (ca. 436 Ma in the Gillis Brook diorite, Gillanders Mountain granite, and ca. 420 Ma in the Leonard McLeod syenogranite), to Devonian (ca. 379 and 363 Ma in the Park Spur granite and Margaree pluton). Two samples were dated using U-Pb in monazite but the results for those were inconclusive and require further work. Overall the U-Pb zircon ages for samples presented here along with other recent work show a more complex magmatic history in the Bras d'Or and Aspy terranes than previously documented, and in particular more widespread Silurian magmatism. Epsilon-Nd data from this study shows that Bras d'Or and Aspy terrane rocks have negative epsilon-Nd values characteristic of Ganderia. These results show Aspy and Bras D'Or terranes likely share similar basement rocks, and are both isotopically distinct from Avalonia, which has mainly positive epsilon-Nd, and is represented in Cape Breton by the Mira terrane.
GEOSCAN ID306404