Kimberlite magmatism induced by west-dipping subduction of the North American plate
Bibliographic record
Abstract
Research Article| March 06, 2019 Kimberlite magmatism induced by west-dipping subduction of the North American plate Wenbo Zhang; Wenbo Zhang * 1Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T5G2E3, Canada *E-mail: wz2@ualberta.ca Search for other works by this author on: GSW Google Scholar Stephen T. Johnston; Stephen T. Johnston 1Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T5G2E3, Canada Search for other works by this author on: GSW Google Scholar Claire A. Currie Claire A. Currie 2Department of Physics, University of Alberta, Edmonton, AB T6G2E1, Canada Search for other works by this author on: GSW Google Scholar Geology (2019) 47 (5): 395–398. https://doi.org/10.1130/G45813.1 Article history received: 15 Nov 2018 rev-recd: 25 Jan 2019 accepted: 06 Feb 2019 first online: 06 Mar 2019 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Wenbo Zhang, Stephen T. Johnston, Claire A. Currie; Kimberlite magmatism induced by west-dipping subduction of the North American plate. Geology 2019;; 47 (5): 395–398. doi: https://doi.org/10.1130/G45813.1 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 SocietyGeology Search Advanced Search Abstract Kimberlite magmas are volatile-rich, potassic, and ultramafic, and they are host to most of the world’s diamond deposits. A continental-scale kimberlite magmatic belt (the central Cretaceous kimberlite corridor [CCKC]) is found in the interior of the North American continent. Parallel to and coeval with the CCKC, the Cretaceous Omineca magmatic belt (OMB) is located in the Cordilleran orogen. Cordilleran magmatism, including the OMB, is commonly explained through long-lived east-dipping subduction beneath the western margin of the continent. However, this does not explain the temporal and spatial relationships between the OMB and CCKC. We suggest that west-dipping subduction of North American lithosphere beneath the eastern side of the Cordillera explains both. In this model, subduction resulted in arc magmatism of the OMB. The contemporaneous CCKC was formed by extensional stress acting on the continent as it flexed upon entry into the trench. Using a semi-infinite elastic beam model, we show that flexure of a subducting continental plate (elastic thickness = 120 km) produces tensile stresses in the deep continental lithosphere, coincident with the location of the CCKC. 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 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.007 | 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 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".