Petrogenesis and Magmatic Evolution of the Guichon Creek Batholith: Highland Valley Porphyry Cu ± (Mo) District, South-Central British Columbia☼
Bibliographic record
Abstract
Research Article| December 01, 2017 Petrogenesis and Magmatic Evolution of the Guichon Creek Batholith: Highland Valley Porphyry Cu ± (Mo) District, South-Central British Columbia☼ Michael D'Angelo; Michael D'Angelo 1Geology Department, Lakehead University, 955 Oliver Rd, Thunder Bay, Ontario P7B 5E1, Canada †e-mail, madangel@lakeheadu.ca Search for other works by this author on: GSW Google Scholar Alfaro Miguel; Alfaro Miguel 2Teck Resources Limited, Suite 3300, 550 Burrard Street, Vancouver, British Columbia V6C 0B3, Canada Search for other works by this author on: GSW Google Scholar Pete Hollings; Pete Hollings 1Geology Department, Lakehead University, 955 Oliver Rd, Thunder Bay, Ontario P7B 5E1, Canada Search for other works by this author on: GSW Google Scholar Kevin Byrne; Kevin Byrne 2Teck Resources Limited, Suite 3300, 550 Burrard Street, Vancouver, British Columbia V6C 0B3, Canada ☼☼Current address: Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada. Search for other works by this author on: GSW Google Scholar Stephen Piercey; Stephen Piercey 3Department of Earth Sciences, Memorial University of Newfoundland, 300 Prince Philip Drive, St. John's, Newfoundland A1B 3X5, Canada Search for other works by this author on: GSW Google Scholar Robert A. Creaser Robert A. Creaser 4Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Michael D'Angelo 1Geology Department, Lakehead University, 955 Oliver Rd, Thunder Bay, Ontario P7B 5E1, Canada Alfaro Miguel 2Teck Resources Limited, Suite 3300, 550 Burrard Street, Vancouver, British Columbia V6C 0B3, Canada Pete Hollings 1Geology Department, Lakehead University, 955 Oliver Rd, Thunder Bay, Ontario P7B 5E1, Canada Kevin Byrne 2Teck Resources Limited, Suite 3300, 550 Burrard Street, Vancouver, British Columbia V6C 0B3, Canada Stephen Piercey 3Department of Earth Sciences, Memorial University of Newfoundland, 300 Prince Philip Drive, St. John's, Newfoundland A1B 3X5, Canada Robert A. Creaser 4Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada †e-mail, madangel@lakeheadu.ca ☼☼Current address: Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada. Publisher: Society of Economic Geologists Accepted: 02 Aug 2017 First Online: 15 Nov 2017 Online Issn: 1554-0774 Print Issn: 0361-0128 © 2017 Economic GeologyEconomic Geology Economic Geology (2017) 112 (8): 1857–1888. https://doi.org/10.5382/econgeo.2017.4532 Article history Accepted: 02 Aug 2017 First Online: 15 Nov 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Michael D'Angelo, Alfaro Miguel, Pete Hollings, Kevin Byrne, Stephen Piercey, Robert A. Creaser; Petrogenesis and Magmatic Evolution of the Guichon Creek Batholith: Highland Valley Porphyry Cu ± (Mo) District, South-Central British Columbia. Economic Geology 2017;; 112 (8): 1857–1888. doi: https://doi.org/10.5382/econgeo.2017.4532 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyEconomic Geology Search Advanced Search Abstract The Late Triassic Guichon Creek batholith is host to the world-class Highland Valley Cu-Mo porphyry system, comprising at least seven known mineralized centers (Valley, Lornex, Highmont, Bethlehem, J.A., Getty North, and Getty South). The Guichon Creek batholith consists of five concentrically zoned intrusive facies that young toward the center of the batholith, ranging from granodiorite and granite in the core to granodiorite and gabbro at the margin, including the (1) Border facies, (2) Highland Valley facies (subdivided into the Guichon and Chataway subfacies), (3) Bethlehem facies, (4) Skeena facies, and (5) Bethsaida facies. Abundant porphyry stocks and dikes are common near the mineralized portions of the batholith. The Bethlehem, Skeena, and Bethsaida facies all host porphyry Cu-(± Mo) mineralization.The petrographic and geochemical characteristics of the Guichon Creek batholith, in addition to crosscutting relationships between facies and new U-Pb ages, suggest that the batholith was emplaced as at least two but possibly three different magma pulses between 211.02 ± 0.17 and 206.95 ± 0.22 Ma. New Re-Os dates of molybdenite from the Highmont and Lornex deposits indicate a mineralizing event at ~208 Ma.The intrusive rocks are characterized by high Sr/Y and low La/Yb ratios and enriched in light rare earth elements (LREE) relative to middle rare earth elements (MREE) and heavy rare earth elements (HREE). This enrichment pattern indicates fractional crystallization of hornblende and clinopyroxene in a lower crustal magma reservoir. Sm-Nd and Rb-Sr isotope systematics (∈Nd(T) = 6.7–7.5; 87Sr/86Sri = 0.70337–0.70356) suggest minor contamination of the oldest intrusive facies by a crustal source, possibly Nicola Group limestones and/or basalts. The geochemistry of the magmas indicates that they were hydrous and oxidized, consistent with the observed mineral assemblage quartz + magnetite + titanite + magnesian-amphibole, which suggests relatively high oxygen fugacities (above the fayalite-magnetite-quartz [FMQ] buffer) and magmatic water contents (≥4 wt %). The primary magmas most likely formed by partial melting processes of metasomatized subarc mantle and underwent amphibole fractionation in a deep crustal magma chamber with no role for slab melts or evidence of ridge subduction. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.008 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".