| Title | Preliminary zircon geochemistry of the northern Hogem Batholith, Quesnel terrane, north-central British Columbia (Parts of NTS 093M/16, 093N/13, 14, 094C/03-06, 094D/01, 08) |
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| Author | Jones, G O; Pearson, D G; Vezinet, A; Luo, Y; Stern, R A; Milidragovic, D ; Ootes, L |
| Source | Geoscience BC, summary of activities 2020: minerals; Geoscience BC, Report 2021-01, 2021 p. 105-120  Open Access |
| Links | Online - En ligne
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| Image |  |
| Year | 2021 |
| Alt Series | Natural Resources Canada, Contribution Series 20200542 |
| Publisher | Geoscience BC |
| Document | serial |
| Lang. | English |
| Media | on-line; digital |
| File format | pdf |
| Province | British Columbia |
| NTS | 93M/16; 93N/13; 93N/14; 94C/03; 94C/04; 94C/05; 94C/06; 94D/01; 94D/08 |
| Area | Osilinka River; Tutizzi Lake; Ominica River |
| Lat/Long WENS | -127.0000 -125.0000 57.0000 55.7500 |
| Subjects | economic geology; geochemistry; geophysics; Nature and Environment; Science and Technology; mineral potential; mineral deposits; porphyry deposits; copper; gold; molybdenum; ore mineral genesis;
mineralization; zircon; isotopic studies; hafnium; lutetium; oxygen isotopes; geochemical analyses; trace element geochemistry; europium; titanium; geophysical surveys; magnetic surveys; radiometric surveys; petrogenesis; magmatism; fluid dynamics;
intrusions; bedrock geology; lithology; igneous rocks; intrusive rocks; diorites; monzodiorites; hornblendites; syenites; volcanic rocks; tuffs; picrites; Hogem Batholith; Quesnel Terrane; Canadian Cordillera; Thane Creek Suite; Duckling Creek Suite;
Lorraine Deposit; Stikine Terrane; Stuhini Group; Phanerozoic; Mesozoic; Cretaceous; Jurassic |
| Illustrations | location maps; tables; plots |
| Program | GSC Pacific Division |
| Released | 2021 01 18 |
| Abstract | (unpublished)
In 2018, Geoscience BC released the Search III airborne magnetic and radiometric data for the area between the Lorraine and Kemess porphyry deposits (Figures 1 and 2; Madu and
Ballantyne, 2018). Following that, the British Columbia Geological Survey initiated a three-year mapping project in order to update the bedrock geology in the southern part of the Search III footprint, with a focus on the northern Hogem batholith
(Figures 1 and 2; Ootes et al., 2019, 2020a, b). As part of the bedrock mapping, this project was initiated to study the details of magma genesis in the batholith and provide insights into the petrogenesis of plutons that are known to host porphyry
style Cu-Au (±Mo) mineralization. The Thane Creek suite (ca. 196 Ma) hosts Cu-Au porphyry occurrences (e.g., Cathedral prospect) and the Duckling Creek suite (ca. 180 Ma) hosts the Lorraine Cu-Au deposit, amongst other prospects and occurrences (Bath
et al., 2014; Devine et al., 2014). This report presents an introduction to a multi-isotopic study from these two intrusive suites. Interpretation of crystallization ages has been previously presented (Bath et al., 2014; Devine et al., 2014; Ootes et
al., 2020b) and the focus of this contribution is the integration of multi-isotopic and trace element study of zircon, and the potential of this data for understanding magmatic fertility. Porphyry deposits typically have alteration haloes that are
destructive to host-rocks (e.g., Byrne et al., 2016). This report focusses on magmatic phases that are associated with porphyry-style mineralization, but sampling was conducted away from mineralized or heavily altered zones. This provides a
background perspective on igneous petrogenesis and regional insights into the controls of magma fertility (versus deposit scale). The data collected for this study was collected from single zircon crystals and includes U-Pb, Lu-Hf ¬, delta-18O, and
trace elements (TE). The U-Pb allows for crystallization age determinations, Lu-Hf provides insight into the juvenile or contaminated nature of the parental magma and its source, delta-18O establishes whether the magmatic source been recycled, and
the TE data allow estimates of temperature and oxidation state during crystallization. |
| Summary | (Plain Language Summary, not published)
The Hogem batholith is a large composite intrusive igneous body located in the Quesnel terrane in north-central British Columbia. The batholith has a
long emplacement history (>90 million years) and hosts known porphyry Cu-Au mineralization in the two oldest intrusive suites, the Thane Creek and Duckling Creek suites. New geochronological and isotopic data, presented here, help resolve the long
magmatic history of the Hogem batholith. |
| GEOSCAN ID | 327593 |
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