Magmatic evolution of the eastern Coast Plutonic Complex, Bella Coola region, west-central British Columbia
Bibliographic record
Abstract
Research Article| September 01, 2009 Magmatic evolution of the eastern Coast Plutonic Complex, Bella Coola region, west-central British Columbia J. Brian Mahoney; J. Brian Mahoney † 1Department of Geology, University of Wisconsin–Eau Claire, 105 Garfield Avenue, Eau Claire, Wisconsin 54702-4004, USA †E-mail: mahonej@uwec.edu Search for other works by this author on: GSW Google Scholar Sarah M. Gordee; Sarah M. Gordee 1Department of Geology, University of Wisconsin–Eau Claire, 105 Garfield Avenue, Eau Claire, Wisconsin 54702-4004, USA2Department of Earth and Ocean Sciences, The University of British Columbia, 6339 Stores Road, Vancouver, BC V6T 1Z4, Canada Search for other works by this author on: GSW Google Scholar James W. Haggart; James W. Haggart 2Department of Earth and Ocean Sciences, The University of British Columbia, 6339 Stores Road, Vancouver, BC V6T 1Z4, Canada3Geological Survey of Canada, 625 Robson Street, Vancouver, BC V6B 5J3, Canada Search for other works by this author on: GSW Google Scholar Richard M. Friedman; Richard M. Friedman 2Department of Earth and Ocean Sciences, The University of British Columbia, 6339 Stores Road, Vancouver, BC V6T 1Z4, Canada Search for other works by this author on: GSW Google Scholar Larry J. Diakow; Larry J. Diakow 4British Columbia Ministry of Energy and Mines, P.O. Box 9320, Station Provincial Government, Victoria, BC V8W 9N3, Canada Search for other works by this author on: GSW Google Scholar Glenn J. Woodsworth Glenn J. Woodsworth 3Geological Survey of Canada, 625 Robson Street, Vancouver, BC V6B 5J3, Canada Search for other works by this author on: GSW Google Scholar GSA Bulletin (2009) 121 (9-10): 1362–1380. https://doi.org/10.1130/B26325.1 Article history received: 06 Sep 2007 rev-recd: 23 Oct 2008 accepted: 21 Nov 2008 first online: 02 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 J. Brian Mahoney, Sarah M. Gordee, James W. Haggart, Richard M. Friedman, Larry J. Diakow, Glenn J. Woodsworth; Magmatic evolution of the eastern Coast Plutonic Complex, Bella Coola region, west-central British Columbia. GSA Bulletin 2009;; 121 (9-10): 1362–1380. doi: https://doi.org/10.1130/B26325.1 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 eastern Coast Plutonic Complex in west-central British Columbia (51–54°N) consists of a broad belt of Jurassic to Eocene granitic to dioritic intrusive rocks that collectively represent more than 140 m.y. of nearly continuous, subduction-related magmatism. Seven distinct intrusive suites have been identified in the Bella Coola region, including, from oldest to youngest, the Howe Lake, Stick Pass, Firvale, Desire, Fougner, Big Snow, and Four Mile suites. Pre–Late Cretaceous rocks were produced by episodic subduction-related magmatism characterized by partial melting of preexisting lower-arc crust, with minimal incorporation of evolved continental material. The eastern Coast Plutonic Complex experienced a magmatic lull between ca. 110 and 95 Ma, coincident with sinistral transpression potentially linked to translational displacement of the Wrangellia-Alexander composite terranes. Crustal thickening in Late Cretaceous time (ca. 100–90 Ma), possibly due to underplating of the Wrangellia-Alexander terrane, produced a deep crustal root (>40 km) that likely extended into the eclogite transition zone. Adakitic magmas (ca. 95–67 Ma) were produced by partial melting of an amphibolitic protolith in this thickened lower-arc crust. Adakitic plutons are pre-, syn-, and postkinematic with respect to Late Cretaceous high-angle shear zones, and they are coeval and spatially associated with postkinematic two-mica granites (ca. 70–75 Ma) having a hybrid A-type geochemistry. We suggest that delamination of this dense crustal root led to voluminous magmatism, extension, and crustal exhumation in Paleocene-Eocene time. The successive intrusive events in the eastern Coast Plutonic Complex may reflect a predictable evolutionary progression common to all continental arc systems. 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 distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.016 | 0.000 |
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 teacher head, 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".