Alkali-Alumina and MgO-Alumina Molar Ratios of Altered and Unaltered Rhyolites
Bibliographic record
Abstract
Research Article| January 01, 2006 Alkali-Alumina and MgO-Alumina Molar Ratios of Altered and Unaltered Rhyolites J.F. DAVIES; J.F. DAVIES 1Department of Earth Sciences, Laurentian University, Sudbury, Ontario P3E 2C6. Search for other works by this author on: GSW Google Scholar R.E. WHITEHEAD R.E. WHITEHEAD 1Department of Earth Sciences, Laurentian University, Sudbury, Ontario P3E 2C6. Search for other works by this author on: GSW Google Scholar Author and Article Information J.F. DAVIES 1Department of Earth Sciences, Laurentian University, Sudbury, Ontario P3E 2C6. R.E. WHITEHEAD 1Department of Earth Sciences, Laurentian University, Sudbury, Ontario P3E 2C6. Publisher: Canadian Institute of Mining, Metallurgy and Petroleum Received: 01 Oct 2003 Accepted: 15 Nov 2005 First Online: 09 Mar 2017 © 2006 Canadian Institute of Mining, Metallurgy and Petroleum Exploration and Mining Geology (2006) 15 (1-2): 75–88. https://doi.org/10.2113/gsemg.15.1-2.75 Article history Received: 01 Oct 2003 Accepted: 15 Nov 2005 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation J.F. DAVIES, R.E. WHITEHEAD; Alkali-Alumina and MgO-Alumina Molar Ratios of Altered and Unaltered Rhyolites. Exploration and Mining Geology 2006;; 15 (1-2): 75–88. doi: https://doi.org/10.2113/gsemg.15.1-2.75 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 SocietyExploration and Mining Geology Search Advanced Search Abstract Alkali-alumina and MgO-alumina plots are an effective instrument for displaying chemical and mineralogical compositions of altered and unaltered rhyolites and rhyodacites. They reveal that most supposedly unaltered rhyolites, apart from those of Cenozoic age, have undergone losses in Na2O and gains in K2O. The extreme loss of Na2O from highly altered rhyolites immediately adjacent to VMS deposits is strikingly illustrated by alkali-alumina plots. MgO/Al2O3 vs. K2O/Al2O3 diagrams display a strong negative correlation between MgO and K2O that results from the conversion of sericite to chlorite. A similar negative correlation between MgO and whole-rock δ18O is apparent on plots of these two parameters.Alkali-alumina plots underscore problems in selecting appropriate precursor compositions required for mass-balance calculations. Molar ratio plots are a viable alternative to such calculations. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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 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".