Petrogenesis and Magmatic Evolution of the Guichon Creek Batholith: Highland Valley Porphyry Cu ± (Mo) District, South-Central British Columbia☼

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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