GEOSCAN, résultats de la recherche

Menu GEOSCAN


TitreAge relationships and preliminary U-Pb zircon geochronology results from the Lynn Lake Greenstone Belt
TéléchargerTéléchargement (publication entière)
AuteurLawley, C J M; Schneider, D; Yang, E; Davis, W J; Jackson, S E; Yang, Z; Zhang, S; Selby, D
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 1; par Rogers, N (éd.); Commission géologique du Canada, Dossier public 8358, 2018 p. 133-137, https://doi.org/10.4095/306459
Année2018
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/306459
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
ProvinceManitoba
SNRC64C/05; 64C/06; 64C/09; 64C/10; 64C/11; 64C/12; 64C/13; 64C/14; 64C/15; 64C/16; 64D/08; 64D/09; 64D/16; 64F/01; 64F/02; 64F/03
Lat/Long OENS-102.0714 -100.0214 57.0642 56.3572
Sujetsgisements minéraux; potentiel minier; prospection minière; genèse des minerais; contrôles des minerais; contrôles structuraux; or; métaux de base; datation radiométrique; datation au uranium-plomb; datations au zircon; antécédents tectoniques; cadre tectonique; métamorphisme; déformation; foliation; formation de failles; paragenèse; altération hydrothermale; intrusions; filons; géologie du substratum rocheux; caractéristiques structurales; failles; zones de cisaillement; roches hôtes; lithologie; roches ignées; roches intrusives; diorites; granites; monzogranites; granodiorites; tonalites; gabbros; roches volcaniques; sediments volcanogènes; rhyolites; dacites; basaltes; tholéiites; andésites; couches volcano-sédimentaires; conglomérats; grauwackes; Ceinture de Lynn Lake Greenstone ; Zone de cisaillement de Johnson ; Orogenèse de Trans-hudson ; Groupe de Sickle ; Groupe de Burntwood ; Groupe de Wasekwan ; géologie économique; géochronologie; tectonique; géologie structurale; Phanérozoïque; Précambrien; Protérozoïque
Illustrationslocation maps; geoscientific sketch maps; tables; photographs
Consultation
Endroit
 
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
 
ProgrammeGestion de la connaissance de IGC, Initiative géoscientifique ciblée (IGC-5)
ProgrammeSystèmes aurifères, Initiative géoscientifique ciblée (IGC-5)
Diffusé2018 01 19
Résumé(disponible en anglais seulement)
Evaluating the genetic link between gold, faulting and metamorphism remains a significant challenge at orogenic gold deposits in the absence of precise geochronological constraints with clear paragenetic context. Here we report new field observations and preliminary U-Pb zircon age results from gold deposits hosted within the Paleoproterozoic Lynn Lake greenstone belt. New zircon ages from a faulted, hydrothermally altered and metamorphosed diorite sample intruding the southern edge of the past-producing open-pit constrain the timing of gold, deformation and metamorphism at the Gordon gold deposit to ?1854 Ma. Auriferous veining thus significantly post-dates the age of the volcano-sedimentary host rocks, which are constrained to 1879 to 1892 Ma based on new zircon age dating from two granitic intrusions south of the Gordon gold deposit. Gold thus clearly post-dates some of the earliest deformation events recognized in the La Ronge - Lynn Lake segments of the Trans-Hudson orogeny (ca. 1.87 Ga). The temporal relationship between gold, peak metamorphism and a major deformation phase at ca. 1.81 Ga will be the focus of ongoing Re-Os pyrite and arsenopyrite geochronology of auriferous veins.
GEOSCAN ID306459