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TitreMount Harper Volcanic Complex, Ogilvie Mountains: A far-flung occurrence of the Franklin Igneous Event?
AuteurCox, G M; Roots, C F; Halverson, G P; Minarik, W G; Macdonald, F A; Hubert-Theou, L
SourceYukon Exploration and Geology 2012; par MacFarlane, K E (éd.); Nordling, M G (éd.); Sack, P J (éd.); 2012 p. 19-36
Année2012
Séries alt.Secteur des sciences de la Terre, Contribution externe 20120369
ÉditeurYukon Geological Survey
Documentlivre
Lang.anglais
Mediapapier; en ligne; numérique
Formatspdf
ProvinceYukon
SNRC116B/12; 116C/09
Lat/Long OENS-140.5000 -139.5000 64.7500 64.5000
Sujetsroches ignées; roches volcaniques; roches magmatiques; pétrographie; altération; cadre tectonique; Complexe de Mount Harper Volcanic ; pétrologie ignée et métamorphique; tectonique; géochimie
Illustrationslocation maps; plots; ternary diagrams; stratigraphic columns; photographs
ProgrammeGisements polymétalliques - nord-ouest de la Cordillère canadienne (Yukon et Colombie-Britannique), GEM : La géocartographie de l'énergie et des minéraux
LiensOnline - En ligne
Résumé(disponible en anglais seulement)
The middle Neoproterozoic (717 Ma) Mount Harper Volcanic Complex is a calc-alkaline magmatic suite developed within a rift system on the northwestern margin of Laurentia. Based on its low Al2O3, Na2O and TiO2 contents, the primary melt was derived from a harzburgitic source, was most likely picritic in composition and required mantle potential temperatures above those recognized for the ambient mantle. Constraints on mantle melting place the mantle at ~ 6 km, a depth that that would require significant crustal attenuation.
Although the volcanic rocks at Mount Harper are the same age as the Franklin large igneous province, the geochemical trends are distinct. Apart from their age, the only plausible link would be to consider the MH BC as the product of a partial melt at the margin of a dispersed mantle plume.
GEOSCAN ID292175