Contrasting thermal and melting histories for segments of mantle lithosphere in the Nahlin ophiolite, British Columbia, Canada

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dc.contributor.authorMcGoldrick, Siobhan
dc.contributor.authorCanil, Dante
dc.contributor.authorZagorevski, Alex
dc.date.accessioned2018-09-27T18:57:04Z
dc.date.copyright2018en_US
dc.date.issued2018-03
dc.description.abstractThe Permo-Triassic Nahlin ophiolite is the largest and best-preserved ophiolite in the Canadian Cordillera of British Columbia and Yukon, Canada. The ophiolite is well-exposed along its ~ 150 km length with mantle segments divisible into the Hardluck and Menatatuline massifs. Both massifs comprise mostly depleted spinel harzburgite (< 2 wt% Al2O3 and ~ 45 wt% MgO). Chondrite normalized REE abundances in clinopyroxene vary in (Gd/Yb)N from 0.2 to 1.1. Inversion modelling of clinopyroxene REE abundances requires 10–16% and 16–20% partial melting in the Hardluck and Menatatuline massifs, respectively. The two-pyroxene and Fe–Mg exchange temperatures in the mantle of the ophiolite also change systematically along strike with the degree of partial melt depletion. The temperatures recorded by REE and Ca-Mg exchange between coexisting pyroxenes require markedly higher peak temperatures and cooling rates for the Menatatuline massif (1250 °C, 0.1–0.01 °C/year) compared to the Hardluck massif (< 1100 °C, ~ 10− 4 °C/year). The differences between these two contiguous massifs can be reconciled by their evolution as two separate segments along a ridge system having varying melt depletion, with contrasting cooling rates controlled by presence or absence of a crustal section above the mantle lithosphere, or by rapid exhumation along a detachment.en_US
dc.description.embargo2019-04-01
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipThis research was supported by scholarships from Natural Sciences and Engineering Research Council of Canada (NSERC) and Geoscience BC to S. McGoldrick, by a NSERC of Canada Discovery Grant to D. Canil, and by funds from the Geological Survey of Canada’s Geomapping for Energy and Minerals program (GEM2-Cordillera) to A. Zagorevski.en_US
dc.identifier.citationMcGoldrick, S., Canil, D. & Zagorevski, A. (2018). Contrasting thermal and melting histories for segments of mantle lithosphere in the Nahlin ophiolite, British Columbia, Canada. Contributions to Mineralogy and Petrology, 173, 25. https://doi.org/10.1007/s00410-018-1450-9en_US
dc.identifier.urihttps://doi.org/10.1007/s00410-018-1450-9
dc.identifier.urihttp://hdl.handle.net/1828/10109
dc.language.isoenen_US
dc.publisherContributions to Mineralogy and Petrologyen_US
dc.subjectMantle
dc.subjectThermometry
dc.subjectMelting
dc.subjectGeochemistry
dc.subjectOphiolite
dc.subjectArc
dc.subjectCordillera
dc.subject.departmentSchool of Earth and Ocean Sciences
dc.titleContrasting thermal and melting histories for segments of mantle lithosphere in the Nahlin ophiolite, British Columbia, Canadaen_US
dc.typePostprinten_US

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