Geochemistry of volcanic and plutonic rocks from the Nahlin ophiolite with implications for a Permo-Triassic arc in the Cache Creek terrane, northwestern British Columbia

Simple item page
dc.contributor.authorMcGoldrick, Siobhan
dc.contributor.authorZagorevski, Alex
dc.contributor.authorCanil, Dante
dc.date.accessioned2018-10-02T19:27:05Z
dc.date.available2018-10-02T19:27:05Z
dc.date.copyright2017en_US
dc.date.issued2017
dc.description.abstractIn northwestern British Columbia, the Permian Nahlin ophiolite in the northern Cache Creek terrane comprises spinel harzburgite tectonite with minor lherzolite, lower crustal mafic and ultramafic cumulates, gabbroic rocks including dikes intruding mantle harzburgite, and basaltic volcanic and volcaniclastic rocks. New lithogeochemical data from the Menatatuline Range area confirm that plutonic and volcanic rocks of the ophiolite are tholeiitic and arc related, while only a minor component of volcanic rocks are alkaline intraplate basalts. Tholeiitic basalts of the Nahlin ophiolite represent the products of 2%–20% fractional melting, and their complementary residue may be peridotite from the ophiolite mantle section. Correlative tholeiitic volcanic sections can be found elsewhere in the northern Cache Creek terrane, and they may be linked to a regionally extensive (∼200 km) intraoceanic arc. The arc tholeiite geochemistry of the plutonic and volcanic rocks, and the highly depleted nature of the mantle residues, imply that the Nahlin ophiolite formed in a supra-subduction zone environment. The Nahlin ophiolite therefore occupied the upper plate during intraoceanic collision prior to emplacement of the Cache Creek terrane. The volumetrically minor ocean island basalt type volcanic rocks in the northern Cache Creek terrane are associated with carbonate successions bearing Tethyan fauna. These sequences are likely fragments of oceanic plateaux and their carbonate atolls sliced off of the subducting plate and are unrelated to the Nahlin ophiolite-arc system.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipThis research was supported by the Geological Survey of Canada’s Geomapping for Energy and Minerals program (GEM2-Cordillera), Natural Sciences and Engineering Research Council of Canada (NSERC) and Geoscience BC scholarships (S. McGoldrick), and NSERC Discovery grant (D. Canil). GSC contribution 20170126.en_US
dc.identifier.citationMcGoldrick, S., Zagorevski, A. & Canil, D. (2017). Geochemistry of volcanic and plutonic rocks from the Nahlin ophiolite with implications for a Permo–Triassic arc in the Cache Creek terrane, northwestern British Columbia. Canadian Journal of Earth Sciences, 54(12), 1214-1227. https://doi.org/10.1139/cjes-2017-0069en_US
dc.identifier.urihttps://doi.org/10.1139/cjes-2017-0069
dc.identifier.urihttp://hdl.handle.net/1828/10135
dc.language.isoenen_US
dc.publisherCanadian Journal of Earth Sciencesen_US
dc.subjectigneous rocksen_US
dc.subjectOphioliteen_US
dc.subjectArcen_US
dc.subjectGeochemistryen_US
dc.subjectCordilleraen_US
dc.titleGeochemistry of volcanic and plutonic rocks from the Nahlin ophiolite with implications for a Permo-Triassic arc in the Cache Creek terrane, northwestern British Columbiaen_US
dc.typePostprinten_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
McGoldrick_Siobhan_CanJEarthSci_2017.pdf
Size:
18.84 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Faculty Publications (BioMed Central & Faculty of Science)
 
University of Victoria Libraries

We acknowledge and respect the Lək̓ʷəŋən (Songhees and Esquimalt) Peoples on whose territory the university stands, and the Lək̓ʷəŋən and W̱SÁNEĆ Peoples whose historical relationships with the land continue to this day.