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TitreFault-mediated melt ascent in a Neoproterozoic continental flood basalt province, the Franklin sills, Victoria Island, Canada
AuteurBédard, J H; Naslund, H R; Nabelek, P; Winpenny, A; Hryciuk, M; Macdonald, W; Hayes, B; Steigerwaldt, K; Hadlari, T; Rainbird, R; Dewing, K; Girard, E
SourceGeological Society of America Bulletin vol. 124, no. 5-6, 2012 p. 723-736,
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110030
Documentpublication en série
Mediapapier; en ligne; numérique
SNRC77G/10; 77G/11; 77G/12; 77G/13; 77G/14; 77G/15; 77G/16; 78B; 87E/12; 87E/13; 87E/14; 87E/15; 87F/09; 87F/10; 87F/15; 87F/16; 87G; 87H; 88A/01; 88A/02; 88A/03; 88A/04; 88A/06; 88A/07; 88A/08; 88A/09
Lat/Long OENS-119.0000 -108.0000 73.2500 70.5000
Sujetsroches ignées; roches plutoniques; basaltes; filons-couches; roches intrusives; nickel; sulfures; gîtes sulfureux; mise en place; pétrologie ignée et métamorphique; Protérozoïque; Précambrien
Illustrationslocation maps; cross-sections; photographs
ProgrammeMétaux communs - Île Victoria (T.N-O. et Nunavut), GEM : La géocartographie de l'énergie et des minéraux
Diffusé2012 02 06
Résumé(disponible en anglais seulement)
The Neoproterozoic Franklin large igneous province on Victoria Island, Canada, is characterized by continental flood basalts and a sill-dominated feeder system. Field relationships indicate that fault-guided transfer zones allowed magma to jump up-section to form higher-level intrusions. Where sills connect to dikes and magmas moved up-section, roof and wall rocks are characterized by wide and intense contact-metamorphic haloes, consistent with throughflow of magma. The geometric constraints suggest that conduits may have opened episodically and then closed when magma pressure waned. The episodic nature of conduit opening events can explain the pulsed ascent of crystal slurries, and may also play a role in the deposition of Ni-sulfides.