| Title | The Mount Hickman ultramafic complex: and Fe-rich Alaskan-style ultramafic intrusion |
| Author | Milidragovic, D; Zagorevski, A; Chapman, J |
| Source | British Columbia Ministry of Energy and Mines, British Columbia Geological Survey Paper no. 2017-1, 2016 p. 117-132 (Open Access) |
| Links | Online - En ligne
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| Year | 2016 |
| Alt Series | Earth Sciences Sector, Contribution Series 20160198 |
| Publisher | British Columbia Geological Survey |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | British Columbia |
| Area | Mount Hickman |
| Lat/Long WENS | -131.1333 -131.0333 57.3000 57.2333 |
| Subjects | dunites; gabbros; intrusions; iron oxides; magmatism; Hickman ultramafic complex; Alaskan-type intrusion; Stikinia; cumulate; Triassic |
| Illustrations | location maps; geological sketch maps; tables; photographs; photomicrographs; histograms |
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| Program | Western Cordillera, Regional porphyry transitions, GEM2: Geo-mapping for Energy and Minerals |
| Abstract | The 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. |
| GEOSCAN ID | 299286 |
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