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TitleFault-mediated melt ascent in a Neoproterozoic continental flood basalt province, the Franklin Sills, Victoria Island, Canada - implications for Ni-sulfide and PGE mineralization
AuthorBédard, J H; Naslund, H R; Steigerwaldt, K; Macdonald, W; Winpenny, A; Hryciuk, M; Hayes, B; Hadlari, TORCID logo; Dewing, KORCID logo; Rainbird, RORCID logo; Girard, E
SourceGeological Association of Canada-Mineralogical Association of Canada, Joint Annual Meeting, Abstracts Volume vol. 34, 2011 p. 14
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20110063
MeetingGAC/AGC - MAC/AMC - SEG - SGA, Ottawa 2011; Ottawa; CA; May 25-27, 2011
Mediapaper; CD-ROM; digital
File formatpdf
ProvinceNorthwest Territories
AreaVictoria Island
Subjectstectonics; igneous and metamorphic petrology; igneous rocks; magmatism; Franklin Igneous Province; Proterozoic; Precambrian
ProgramGEM: Geo-mapping for Energy and Minerals, PGE/Base Metals - Victoria Island (NWT and Nunavut)
AbstractThe Neo-Proterozoic Franklin Large Igneous Province on Victoria Island, Canada, is characterized by continental flood basalts and a sill-dominated feeder system. Field relationships indicate that there were ephemeral fault-guided transfer zones that allowed magma to jump up-section to form higher-level intrusions. In the corner regions where the magmas move up-section, roof rocks are characterized by unusually wide and intense contact metamorphic haloes, implying significant magmatic throughflow, favourable for Norilsk' type Ni-S mineralization. The geometric constraints suggest that the conduits may have opened episodically, and would be ephemeral, closing when magma pressure waned. The episodic nature of conduit opening events can account for pulsed ascent of crystal slurries, and explains the rarity of exposed feeder conduits in the geological record. Residual oxide-sulfide-saturated fluids expelled from the feeder sill during roof subsidence would have been channelled by the fault, and reacted with contact-metamorphosed roof rocks to form skarns.

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