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TitleGeochronology of northern Hogem Batholith, Quesnel Terrane, north-central British Columbia
AuthorJones, G; Ootes, L; Schiarizza, P; Milidragovic, DORCID logo; Friedman, R; Camacho, A; Luo, Y; Vezinet, A; Pearson, D G
SourceGeological fieldwork 2020: a summary of field activities and current research; British Columbia Geological Survey Paper 2021-01, 2021 p. 37-56 Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesNatural Resources Canada, Contribution Series 20200583
PublisherBritish Coulmbia Ministry of Energy, Mines and Petroleum Resources
Mediaon-line; digital
File formatpdf
ProvinceBritish Columbia
NTS93N/03; 93N/04; 93N/05; 93N/06; 93N/11; 93N/12; 93N/13; 93N/14; 94C/03; 94C/04; 94C/05; 94C/06; 94C/11; 94C/12; 94C/13; 94C/14
Lat/Long WENS-126.0000 -125.0000 57.0000 55.0000
Subjectseconomic geology; geochronology; geochemistry; Science and Technology; Nature and Environment; mineral potential; mineral deposits; porphyry deposits; copper; gold; radiometric dating; uranium lead dating; argon argon dating; tectonic history; magmatism; intrusions; emplacement; crystallization; mass spectrometer analysis; whole rock geochemistry; bedrock geology; lithology; igneous rocks; intrusive rocks; Hogem Batholith; Quesnel Terrane; Canadian Cordillera; Thane Creek Suite; Duckling Creek Suite; Osilinka Suite; Mesilinka Suite; Stikine Terrane; Phanerozoic; Mesozoic; Cretaceous; Jurassic; Triassic
Illustrationslocation maps; geoscientific sketch maps; ternary diagrams; plots; tables; Concordia diagrams; bar graphs; geochronological charts
ProgramGSC Pacific Division
Released2021 01 18
AbstractNew and previously unpublished geochronological data that complement bedrock mapping and geochemical studies in northern Hogem batholith indicate punctuated emplacement of four distinct intrusive suites during a protracted (ca. 80 Ma) interval, from 207 to 128 Ma. U-Pb crystallization ages include new zircon (by LA-ICP-MS), previously unpublished legacy zircon and titanite (by ID-TIMS), and published zircon (by CA-TIMS). Amphibole, biotite, and muscovite 40Ar/39Ar step-heating results provide magmatic cooling ages and post-deformation cooling ages. The Thane Creek suite, composed of mostly metaluminous diorite to quartz monzodiorite with lesser hornblendite, intruded host Nicola Group strata between 207 and 194 Ma. The Duckling Creek suite consists of alkaline biotite clinopyroxenite and syenite that intruded the Thane Creek suite between 182 and 175 Ma. The Osilinka suite, represented by a weakly peraluminous leucocratic granite body, yielded a maximum emplacement age of ca. 160 Ma. The Mesilinka suite consists of metaluminous tonalite and weakly peraluminous granodiorite to granite, with interpreted crystallization ages ranging from 135 to 128 Ma. Bedrock mapping and geochronologic results from this study indicate that northern Hogem batholith contains prospective rocks comparable to those that host the Lorraine and other deposits south of the present study area. The Hogem batholith is relatively unique in the Canadian Cordillera because it contains a remarkable evolution of punctuated Upper Triassic to Lower Cretaceous intrusive suites that are compositionally and chemically diverse. A new discovery is that the Mesilinka suite (Lower Cretaceous) intruded during a Cordilleran-wide magmatic lull.
Summary(Plain Language Summary, not published)
The Hogem batholith is a large composite intrusive body located in the Quesnel terrane in north-central British Columbia. The batholith has a long emplacement history (>90 million years), represented by four intrusive suites: the Thane Creek suite (207-194 Ma), the Duckling Creek suite (182-175 Ma), the Osilinka suite (ca. 160 Ma), and the Mesilinka suite (135-128 Ma). This paper presents the summary of the geochronological data available for the northern Hogem batholith.

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