Thickness and composition of the Bonanza arc crustal section, Vancouver Island, Canada
Bibliographic record
Abstract
Research Article| July 01, 2010 Thickness and composition of the Bonanza arc crustal section, Vancouver Island, Canada Dante Canil; Dante Canil † School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8W 3P6, Canada †E-mail: dcanil@uvic.ca Search for other works by this author on: GSW Google Scholar Jolene Styan; Jolene Styan School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8W 3P6, Canada Search for other works by this author on: GSW Google Scholar Jeff Larocque; Jeff Larocque School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8W 3P6, Canada Search for other works by this author on: GSW Google Scholar Emilie Bonnet; Emilie Bonnet School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8W 3P6, Canada Search for other works by this author on: GSW Google Scholar Jeff Kyba Jeff Kyba School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8W 3P6, Canada Search for other works by this author on: GSW Google Scholar GSA Bulletin (2010) 122 (7-8): 1094–1105. https://doi.org/10.1130/B26578.1 Article history received: 12 Nov 2008 rev-recd: 17 Aug 2009 accepted: 20 Aug 2009 first online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Dante Canil, Jolene Styan, Jeff Larocque, Emilie Bonnet, Jeff Kyba; Thickness and composition of the Bonanza arc crustal section, Vancouver Island, Canada. GSA Bulletin 2010;; 122 (7-8): 1094–1105. doi: https://doi.org/10.1130/B26578.1 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 SocietyGSA Bulletin Search Advanced Search Abstract The composition and origin of continental crust is in part constrained by evidence preserved in exhumed arc crustal sections. The Bonanza arc on Vancouver Island, Canada, is a Jurassic-aged arc crust section exhumed in the Eocene. We use Al-in-hornblende geobarometry of felsic plutons in the Bonanza arc to assess the depths of crystallization of its exposed arc crust. Plutons of the unfoliated Island Plutonic Suite are emplaced as sheets at depths of 2–10 km within a stratigraphy of Devonian to Triassic supracrustal rocks. The West Coast Complex is more generally strained, and intrudes below the pre-Jurassic supracrustals at depths of 10–18 km. Previous work shows that rare ultramafic units within the West Coast Complex crystallized at depths of 14–26 km.The Bonanza arc crustal section has a present structural thickness of at least 15 km. The average composition for each arc component (volcanic and plutonics) when apportioned into the crustal section derived by stratigraphy and hornblende barometry, shows the bulk composition of the entire arc is basaltic andesite (56% SiO2, Mg/Mg + Fe (Mg#) = 50), not unlike some estimates for bulk continental crust. Although only vestiges of ultramafic rocks occur in the Bonanza arc today, a significant component (6–20 km) of this rock type must have been present in the section for the bulk arc to have been a melt in equilibrium with mantle olivine, and may have been lost by foundering or tectonic thinning. 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 | 0.003 | 0.006 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.002 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.010 | 0.002 |
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".