Journal
CANADIAN JOURNAL OF EARTH SCIENCES
Volume 52, Issue 7, Pages 444-465Publisher
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/cjes-2014-0215
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- NSERC Discovery Grant program
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The Matthew Creek Metamorphic Zone (MCMZ) exposes what is inferred to be the lowest structural level of the lower Aldridge Formation in the Canadian portion of the Belt-Purcell Supergroup. Zircon, monazite, and titanite were dated using the U-Pb system by LA-ICP-MS. The detrital zircon populations of quartzite layers in these rocks define a provenance dominated by sources of Laurentian affinity with a minor component of non-North American ages between 1600 and 1490 Ma. Special attention was paid to monazite in sillimanite-grade metapelitic schists that was analyzed using in situ LA-ICP-MS techniques guided by BSE imaging and compositional mapping. Textural and geochronological evidence indicate that coupled dissolution-reprecipitation affected detrital monazite at 1413 +/- 10 Ma. This was followed by prograde monazite growth at 1365 +/- 10 Ma, synchronous with crystallization of the nearby Hellroaring Creek peraluminous granite at 1365 +/- 5 Ma. Late-stage pegmatite emplacement and ductile shearing along the contact of the MCMZ and overlying rocks occurred at 1335 +/- 5 Ma, interpreted as a period of post-collisional extension, core complex formation, exhumation, and decompression melting. The entire package was subsequently affected by a pervasive similar to 1050 Ma hydrothermal overprint that partially reset U-Pb dates in monazite, zircon, and titanite contained in all lithologies examined. The lowermost Belt-Purcell stratigraphy in southeast British Columbia preserves a detailed record of sedimentary provenance and a long history of episodic collision and extension that must be reconciled with plate reconstruction models for the break-up of the Nuna supercontinent and assembly of Rodinia.
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