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TitreThe Kivalliq Igneous Suite: Anorogenic bimodal magmatism at 1.75 Ga in the western Churchill Province, Canada
AuteurPeterson, T D; Scott, J M J; LeCheminant, A N; Jefferson, C W; Pehrsson, S J
SourcePrecambrian Research vol. 262, 2015 p. 101-119, https://doi.org/10.1016/j.precamres.2015.02.019
Année2015
Séries alt.Secteur des sciences de la Terre, Contribution externe 20130347
ÉditeurElsevier
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1016/j.precamres.2015.02.019
Mediapapier; numérique; en ligne
Formatspdf; html
ProvinceAlberta; Manitoba; Territoires du Nord-Ouest; Nunavut; Ontario; Saskatchewan
SNRC36N/06; 36N/07; 36N/08; 36B/09; 36N/10; 36N/11; 36N/14; 36N/15; 36N/16; 37B; 37C; 37F; 37G; 38A/03; 38A/04; 38A/05; 38A/11; 38B; 38C; 43J/09; 43J/10; 43J/11; 43J/12; 43J/13; 43J/14; 43J/15; 43J/16; 43K/09; 43K/10; 43K/11; 43K/12; 43K/13; 43K/14; 43K/15; 43K/16; 43L/09; 43L/10; 43L/11; 43L/12; 43L/13; 43L/14; 43L/15; 43L/16; 43M; 43N; 43O; 44D/03; 44D/04; 44D/05; 45J/03; 45J/04; 45J/05; 45J/06; 45J/07; 45J/09; 45J/10; 45J/11; 45J/12; 45J/13; 45J/14; 45J/15; 45J/16; 45M/09; 45M/10; 45M/11; 45M/14; 45M/15; 45M/16; 45N/02; 45N/03; 45N/04; 45N/05; 45N/06; 45N/07; 45N/09; 45N/10; 45N/11; 45N/12; 45N/13; 45N/14; 45N/15; 45N/16; 45O/09; 45O/10; 45O/16; 45P/09; 45P/10; 45P/11; 45P/12; 45P/13; 45P/14; 45P/15; 45P/16; 46; 47; 48A; 48B; 48C; 48D; 53J/09; 53J/10; 53J/11; 53J/12; 53J/13; 53J/14; 53J/15; 53J/16; 53K/09; 53K/10; 53K/11; 53K/12; 53K/13; 53K/14; 53K/15; 53K/16; 53L/09; 53L/10; 53L/11; 53L/12; 53L/13; 53L/14; 53L/15; 53L/16; 53M; 53N; 53O; 53P; 54A; 54B; 54C; 54D; 54E; 54F; 54G/01; 54G/02; 54G/03; 54G/04; 54G/06; 54G/07; 54K; 54L; 54M; 55D; 55E; 55F/12; 55F/13; 55F/14; 55J/13; 55J/14; 55F/15; 55K; 55L; 55M; 55N; 55O; 56; 57; 58A; 58B; 58C; 58D; 62E; 62F/04; 62F/05; 62F/11; 62F/12; 62K/04; 62K/05; 62K/11; 62K/12; 62L; 62M; 62N; 62O/04; 62O/05; 62O/11; 62O/12; 63B/04; 63B/05; 63B/11; 63B/12; 63C; 63D; 63E; 63F; 63G/04; 63G/05; 63G/11; 63G/12; 63I/09; 63I/10; 63I/11; 63I/12; 63I/13; 63I/14; 63I/15; 63I/16; 63J/04; 63J/05; 63J/06; 63J/07; 63J/08; 63J/09; 63J/10; 63J/11; 63J/12; 63J/13; 63J/14; 63J/15; 63J/16; 63K; 63L; 63M; 63N; 63O; 63P; 64; 65; 66; 67; 68A; 68B; 68C; 68D; 72E; 72F; 72G; 72H; 72I; 72J; 72K; 72L; 72M; 72N; 72O; 72P; 73; 74; 75; 76; 77; 78A; 78B; 78D; 82P/01; 82P/08; 82P/09; 82P/16; 83A/01; 83A/02; 83A/07; 83A/08; 83A/09; 83A/10; 83A/15; 83A/16; 83H/01; 83H/02; 83H/07; 83H/08; 83H/09; 83H/10; 83H/15; 83H/16; 83I/01; 83I/02; 83I/07; 83I/08; 83I/09; 83I/10; 83I/15; 83I/16; 83P/01; 83P/02; 83P/07; 83P/08; 83P/09; 83P/10; 83P/15; 83P/16; 84A; 84G/01; 84G/08; 84G/09; 84G/10; 84G/15; 84G/16; 84H/01; 84J/01; 84J/02; 84J/06; 84J/07; 84J/08; 84J/09; 84J/10; 84J/11; 84J/14; 84J/15; 84J/16; 84O; 84P; 85A; 85B; 85C/01; 85C/08; 85C/09; 85C/10; 85C/15; 85C/16; 85F/01; 85F/02; 85F/07; 85F/08; 85F/09; 85F/10; 85F/11; 85F/14; 85F/15; 85F/16; 85G; 85H; 85I; 85J; 85K; 85L/16; 85M/01; 85M/02; 85M/07; 85M/08; 85M/09; 85M/10; 85M/11; 85M/14; 85M/15; 85M/16; 85N; 85O; 85P; 86; 87; 88A; 88B; 88D; 96A/16; 96B; 96H/01; 96H/02; 96H/07; 96H/08; 96H/09; 96H/10; 96H/15; 96H/16; 96I/16; 96N/01; 96N/08; 96N/09; 96N/10; 96N/15; 96N/16; 97A; 97C/08; 97C/09; 97C/10; 97C/15; 97C/16; 97D; 98A/01; 98A/02; 98A/08
Lat/Long OENS-126.0000 -74.0000 73.7500 49.0000
Sujetséléments en trace; magmatisme; roches ignées; granites; rhyolites; roches volcaniques; assemblages de minéraux; cadre tectonique; analyses pétrographiques; analyses géochimiques; géochimie de l'uranium; géochimie des terres rares; géochimie du thorium; géochimie de l'yttrium; géochimie du zirconium; roches mafiques; filons rocheux; Province de Churchill ; Granite de Nueltin ; Formation de Pitz ; Supergroupe de Dubawnt ; Groupe de Wharton ; Zone de Snowbird Tectonic ; tectonique; pétrologie ignée et métamorphique; géochimie; géologie économique; Protérozoïque
Illustrationsgeological sketch maps; photographs
ProgrammeUranium, GEM : La géocartographie de l'énergie et des minéraux
Résumé(disponible en anglais seulement)
The Kivalliq Igneous Suite (1.77--1.73 Ga) includes the Nueltin Granite intrusions; gabbro and anorthosite intrusions; three swarms of mafic dykes; and basalt, rhyolite and pyroclastic rocks of the Pitz Formation (Wharton Group, middle Dubawnt Supergroup). It was emplaced in the reworked Archaean hinterland of the trans-Hudson orogen, in the central western Churchill Province (WCP) of the Canadian Shield. The Nueltin granites have field relations, mineral assemblages, and compositions typical of metaluminous to peraluminous, Proterozoic to Recent rapakivi granites, and the suite comprises a classic bimodal anorogenic province. Kivalliq rhyolites/granites were erupted/emplaced in a N--S band (the "Nueltin corridor") about 700 km long and 300 km wide, with volcanic rocks and dykes concentrated at the north end and coarse plutonic rocks to the south. The McRae Lake dyke swarm originates among three prominent gabbro/anorthosite intrusions inside the corridor, and forms a narrow array extending a minimum of 600 km to the NE along the central axis of the WCP. Early mafic rocks (intrusions and some lavas, 1.77 Ga) had an alkali basalt parent, with subalkaline basalts (sills, dykes, and mafic enclaves) present at the peak time of granite emplacement (1.75 Ga). Average initial ?Nd of basaltic rocks at 1.75 Ga is -4.0, indicating a significant crustal component. Sm--Nd depleted mantle model ages of granites and rhyolites (average initial ?Nd = -8.7) range from 2.2 to 3 Ga, consistent with melted Archaean crust variably mixed with juvenile basalt. Metallogenic prospects of the Kivalliq Suite include U-Th-Zr-Y-REE enriched granite and syenite, epithermal Ag/Au at silicic centres (including mafic/felsic ring complexes), and Pb--Cu sulphides associated with mafic intrusions. Topaz rhyolites are present, but Sn-enriched rocks have not been observed. The Kivalliq Suite is one of about 15 prominent anorogenic provinces and dyke swarms which erupted within the Nuna supercontinent at ca. 1.75 Ga, and the thermal effects of the Kivalliq event are recorded in U--Pb and K--Ar data throughout most of the western Churchill Province.
Résumé(Résumé en langage clair et simple, non publié)
La suite de roches ignées de Kivalliq constitue une province de granite basalte anorogénique typique dans le centre ouest de la Province de Churchill. La suite est exceptionnelle compte tenu de sa taille (environ 1 000 km de longueur), de l¿étendue de la préservation des roches volcaniques et de l¿étendue à l¿échelle de la province d¿événements thermiques connexes causés par un sous placage basaltique de la croûte. Le basalte est plus alcalin, et de source plus profonde, que celui présent dans la plupart des suites anorogéniques. Les zones minérales productives possibles présentant un intérêt incluent les intrusions riches en U Th ETR (éléments de terres rares), les systèmes hydrothermaux avec Ag Au et les veines/systèmes de remplacement avec Pb Cu.
GEOSCAN ID293384