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TitleThe Mount Hickman ultramafic complex: and Fe-rich Alaskan-style ultramafic intrusion
AuthorMilidragovic, DORCID logo; Zagorevski, AORCID logo; Chapman, JORCID logo
SourceBritish Columbia Ministry of Energy and Mines, British Columbia Geological Survey Paper no. 2017-1, 2016 p. 117-132 Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20160198
PublisherBritish Columbia Geological Survey
Mediapaper; on-line; digital
File formatpdf
ProvinceBritish Columbia
AreaMount Hickman
Lat/Long WENS-131.1333 -131.0333 57.3000 57.2333
Subjectsdunites; gabbros; intrusions; iron oxides; magmatism; Hickman ultramafic complex; Alaskan-type intrusion; Stikinia; Triassic
Illustrationslocation maps; geological sketch maps; tables; photographs; photomicrographs; histograms
ProgramGEM2: Geo-mapping for Energy and Minerals Western Cordillera, Regional porphyry transitions
AbstractThe Mount Hickman ultramafic complex (Triassic) is a composite Alaskan-type ultramafic pluton in Stikine terrane, northwestern British
Columbia. Cumulate rocks in the complex are mainly olivine ±magnetite clinopyroxenite, but include subordinate serpentinized dunite, wehrlite, and gabbro. Magnetite is a volumetrically signifi cant primary phase, especially in magnetite-olivine clinopyroxenite, where it may constitute up to 40% by volume. In contrast to most other Alaskan-type intrusions, and terrestrial ultramafi c plutons in general, the Mount Hickman ultramafic complex has an unusually high concentration of FeOTOT, including ~21 wt.% in dunite. We currently favour a model in which the high contents of FeOTOT in the Mount Hickman ultramafi c complex refl ect mixing of two types of magma: a relatively primitive ultramafic(picritic/basaltic silicate magma, and a dense Fe-Ti-P - rich highly oxidized magma.
Summary(Plain Language Summary, not published)
Understanding the circumstances and processes that lead to evolution of magmas is critical to understanding formation of copper-gold-molybdenum mining districts in Canada and world. This study investigates the Mount Hickman complex, an intrusive body which shortly predates copper-gold-molybdenum mineralization at the nearby Schaft Creek deposit. The rock types and chemistry of the Mount Hickman ultramafic complex suggest mixing of at least two magma types. The results of this research provide a baseline for future studies of similar rocks that outcrop in northwestern British Columbia and which may be intimately related to both copper-gold-molybdenum and nickel-copper-platinum group element mineralization.

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