Creation of a continent recorded in zircon zoning
Bibliographic record
Abstract
Research Article| March 01, 2008 Creation of a continent recorded in zircon zoning Desmond E. Moser; Desmond E. Moser 1Department of Earth Sciences, University of Western Ontario, London, Ontario N6A 5B7, Canada Search for other works by this author on: GSW Google Scholar John R. Bowman; John R. Bowman 2Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA Search for other works by this author on: GSW Google Scholar Joseph Wooden; Joseph Wooden 3U.S. Geological Survey, Menlo Park, California 94305, USA Search for other works by this author on: GSW Google Scholar John W. Valley; John W. Valley 4Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin 53706, USA Search for other works by this author on: GSW Google Scholar Frank Mazdab; Frank Mazdab 5U.S. Geological Survey, Menlo Park, California 94305, USA Search for other works by this author on: GSW Google Scholar Noriko Kita Noriko Kita 6Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin 53706, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Desmond E. Moser 1Department of Earth Sciences, University of Western Ontario, London, Ontario N6A 5B7, Canada John R. Bowman 2Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA Joseph Wooden 3U.S. Geological Survey, Menlo Park, California 94305, USA John W. Valley 4Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin 53706, USA Frank Mazdab 5U.S. Geological Survey, Menlo Park, California 94305, USA Noriko Kita 6Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin 53706, USA Publisher: Geological Society of America Received: 10 Sep 2007 Revision Received: 15 Nov 2007 Accepted: 17 Nov 2007 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 The Geological Society of America, Inc. Geology (2008) 36 (3): 239–242. https://doi.org/10.1130/G24416A.1 Article history Received: 10 Sep 2007 Revision Received: 15 Nov 2007 Accepted: 17 Nov 2007 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Desmond E. Moser, John R. Bowman, Joseph Wooden, John W. Valley, Frank Mazdab, Noriko Kita; Creation of a continent recorded in zircon zoning. Geology 2008;; 36 (3): 239–242. doi: https://doi.org/10.1130/G24416A.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 We have discovered a robust microcrystalline record of the early genesis of North American lithosphere preserved in the U-Pb age and oxygen isotope zoning of zircons from a lower crustal paragneiss in the Neoarchean Superior province. Detrital igneous zircon cores with δ18O values of 5.1‰–7.1‰ record creation of primitive to increasingly evolved crust from 2.85 ± 0.02 Ga to 2.67 ± 0.02 Ga. Sharp chemical unconformity between cores and higher δ18O (8.4‰–10.4‰) metamorphic overgrowths as old as 2.66 ± 0.01 Ga dictates a rapid sequence of arc unroofing, burial of detrital zircons in hydrosphere-altered sediment, and transport to lower crust late in upper plate assembly. The period to 2.58 ± 0.01 Ga included ∼80 m.y. of high-temperature (∼700–650 °C), nearly continuous overgrowth events reflecting stages in maturation of the subjacent mantle root. Huronian continental rifting is recorded by the youngest zircon tip growth at 2512 ± 8 Ma (∼ 600 °C) signaling magma intraplating and the onset of rigid plate behavior. This >150 m.y. microscopic isotope record in single crystals demonstrates the sluggish volume diffusion of U, Pb, and O in zircon throughout protracted regional metamorphism, and the consequent advances now possible in reconstructing planetary dynamics with zircon zoning. 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 | 0.003 | 0.006 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.010 | 0.016 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.003 | 0.002 |
| Open science | 0.001 | 0.004 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.023 | 0.005 |
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".