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

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...

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Bibliographic Details
Published in:Geological Society of America Bulletin
Main Authors: 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
Format: Article in Journal/Newspaper
Language:unknown
Published: 2012
Subjects:
continental flood basalt
feeder system
geometric constraint
large igneous provinces
magma pressure
Neoproterozoic
throughflow
transfer zones
Canada
Wall Rocks
Victoria Island
victoria island
Online Access:https://espace.inrs.ca/id/eprint/7253/
https://doi.org/10.1130/B30450.1
Description
Summary: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.

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