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Fault-mediated melt ascent in a Neoproterozoic continental flood basalt province, the Franklin sills, Victoria Island, Canada

Bédard, Jean H.; Naslund, H. Richard; Nabelek, Peter; Winpenny, Adam; Hryciuk, Matthew; Macdonald, William; Hayes, Ben; Steigerwaldt, Kathryn; Hadlari, Thomas; Rainbird, Robert; Dewing, Keith; Girard, Éric (2012). Fault-mediated melt ascent in a Neoproterozoic continental flood basalt province, the Franklin sills, Victoria Island, Canada Geological Society of America Bulletin , vol. 124 , nº 5-6. p. 723-736. DOI: 10.1130/B30450.1.

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Résumé

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 upsection, 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.

Type de document: Article
Mots-clés libres: continental flood basalt; feeder system; geometric constraint; large igneous provinces; magma pressure; Neoproterozoic; throughflow; transfer zones
Centre: Centre Eau Terre Environnement
Date de dépôt: 19 oct. 2018 14:21
Dernière modification: 19 oct. 2018 14:21
URI: http://espace.inrs.ca/id/eprint/7253

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