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TitleUsing basalt-hosted xenoliths as probes of the composition, structure and rheology of the sub-Cordilleran lithosphere in British Columbia
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorKroner, R K; Chapman, J BORCID logo; Russell, J K
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 2; by Rogers, N (ed.); Geological Survey of Canada, Open File 8373, 2018 p. 93-100, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative: 2017 report of activities, volume 2
File formatpdf
ProvinceBritish Columbia
NTS82E; 82F/04; 82F/05; 82F/12; 82F/13; 82K/04; 82K/05; 82K/12; 82K/13; 82L; 82M; 83D; 83E; 83L; 92G; 92H; 92I; 92J; 92O; 92P; 93A; 93B; 93G; 93H; 93I; 93J
AreaPrince George; Summit Lake; Okanagan; Lightning Peak; Mount Timothy; Lac la Hache
Lat/Long WENS-124.0000 -117.5000 54.6667 49.0000
Subjectseconomic geology; structural geology; geochemistry; igneous and metamorphic petrology; mineral deposits; mineral exploration; mineral potential; porphyry deposits; ore mineral genesis; mineralization; ore controls; crustal studies; crustal structure; lithosphere; mantle; bedrock geology; lithology; igneous rocks; volcanic rocks; mafic volcanic rocks; basalts; xenoliths; intrusive rocks; ultramafic rocks; peridotites; lherzolites; gabbros; granitic rocks; metamorphic rocks; granulites; quartzites; rheology; electron probe analyses; mass spectrometer analysis; electron diffraction analyses; bulk composition; Canadian Cordillera; Chilcotin Group; Quesnel Terrane; Stikine Terrane; North American Craton; Okanagan Terrane; Phanerozoic; Cenozoic; Quaternary; Tertiary
Illustrationsgeoscientific sketch maps; photographs
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5) Porphyry systems
Released2018 03 01
AbstractThis study seeks to illuminate the chemistry, structure, and rheology of the crustal and mantle lithosphere beneath the Canadian Cordillera using crustal and mantle xenoliths entrained in Quaternary to early Paleogene mafic volcanics. Most of the xenolith-bearing units belong to the Chilcotin Group basalts in southern British Columbia and fall within the Quesnel and Stikine accreted terranes. The sampling locations of Summit Lake north of Prince George, Lightning Peak in the Okanagan region and Mt. Timothy east of Lac la Hache were selected for the diversity of entrained xenoliths. Ultramafic mantle xenoliths include multiple types of peridotite, with lherzolite the most abundant in all locations. Crustal xenoliths include gabbro, granitoid, granulite and quartzite.
Pressure and depths of equilibration for the samples will be determined by microprobe analyses of various minerals in the xenoliths. This will be the first step toward creating a comprehensive petrological cross section of the southern Cordilleran lithosphere.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is directed towards providing next generation knowledge and methods to facilitate more effective targeting of buried mineral deposits. The program aims to enhance the effectiveness of exploration for Canada¿s major mineral systems by resolving foundational geoscience problems that constrain the geological processes responsible for the liberation metals from their source region, transportation of these ore metals and control their eventual deposition. TGI supports projects on gold, Ni-Cr-PGE, porphyry-style mineralization, uranium and volcanic- and sedimentary-hosted base metal mineralization ore systems, with each project divided into subprojects focused on resolving specific knowledge gaps by integrating data and studies from multiple sites across Canada. Herein, we present interim results and interpretations from a selection of the research activities currently being conducted under the auspices of TGI.

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