Late Cretaceous truncation of the western Idaho shear zone in the central North American Cordillera
Bibliographic record
Abstract
Research Article| August 01, 2007 Late Cretaceous truncation of the western Idaho shear zone in the central North American Cordillera W.C. McClelland; W.C. McClelland 1Department of Geological Sciences, University of Idaho, Moscow, Idaho 83844-3022, USA Search for other works by this author on: GSW Google Scholar J.S. Oldow J.S. Oldow 1Department of Geological Sciences, University of Idaho, Moscow, Idaho 83844-3022, USA Search for other works by this author on: GSW Google Scholar Geology (2007) 35 (8): 723–726. https://doi.org/10.1130/G23623A.1 Article history received: 16 Dec 2006 rev-recd: 10 Mar 2007 accepted: 23 Mar 2007 first online: 09 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 W.C. McClelland, J.S. Oldow; Late Cretaceous truncation of the western Idaho shear zone in the central North American Cordillera. Geology 2007;; 35 (8): 723–726. doi: https://doi.org/10.1130/G23623A.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 The Mesozoic boundary separating accreted oceanic rocks and continental North America in west-central Idaho forms a prominent right-angle bend, the origin and kinematic significance of which have had a great influence on models for the evolution of the North American Cordilleran orogen. Based on structural and geochronologic relations, we conclude that the bend in the steep crustal boundary is formed by the intersection of two shear zones with different ages. Structural fabrics of the north-striking western Idaho shear zone are overprinted by penetrative structures of the west-northwest–striking Orofino shear zone. U-Pb sensitive high-resolution ion microprobe ages on metaplutonic rocks and late synkinematic leucocratic dikes constrain the age of deformation in the Orofino shear zone to ca. 90–70 Ma, distinctly younger than ca. 120–90 Ma magmatism and deformation within the western Idaho shear zone. The Orofino shear zone is interpreted as a southwest-vergent contractional relay structure that linked basement-cored foreland thrusts of the Middle and Southern Rocky Mountains with the deep crustal duplex of the Shuswap complex in the Canadian Rockies. Truncation ca. 90 Ma terminated Late Cretaceous margin-parallel translation of terranes along the western Idaho shear zone and required displacement to step outboard to poorly understood structures to the west. 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) | 0.001 | 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".