INTERSECTING ISOGRADS IN REGIONALLY METAMORPHOSED SILICEOUS DOLOMITIC MARBLE OF THE SHARBOT LAKE DOMAIN, GRENVILLE PROVINCE, SOUTHEASTERN ONTARIO
Bibliographic record
Abstract
The aim of this paper is to describe the mineralogy and petrology of siliceous, dolomitic marbles in the Sharbot Lake domain, as exposed in the Almonte – Carleton Place area of Ontario. Five isograds based on specific metamorphic reactions were mapped in the area. The delineation of the isograds is based on detailed mapping, petrographic analysis of assemblages of coexisting minerals, and a polybaric T– X (CO2) diagram, calculated using thermobarometric data from associated gneissic rocks. The T– X section is based on a field gradient of ~47°C/km. In order of increasing metamorphic grade, the isograds are: \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \[\mathit{Talc out}: 2 talc + 3 calcite = tremolite + dolomite + H\_{2}O + CO\_{2}\] \end{document} \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \[\mathit{Tremolite} + \mathit{Calcite in}: 5 dolomite + 8 quartz + H\_{2}O = tremolite + 3 calcite + 7 CO\_{2}\] \end{document} \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \[\mathit{Tremolite} + \mathit{K feldspar in}: 24 quartz + 6 calcite + 5 phlogopite = 3 tremolite + 5 K feldspar + 2 H\_{2}O + 6 CO\_{2}\] \end{document} \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \[\mathit{Diopside in}: tremolite + 3 calcite + 2 quartz = 5 diopside + 3 CO\_{2} + H\_{2}O\] \end{document} \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \[\mathit{Diopside} + \mathit{Dolomite in}: tremolite + 3 calcite = dolomite + 4 diopside + H\_{2}O + CO\_{2}\] \end{document} Mineral assemblages above and below each isograd are described, and relevant examples are shown. These isograds intersect in a manner that can be explained in terms of a fluid gradient in a mixed-volatile fluid (an example of fluid infiltration). Evidence for internal buffering of the mixed-volatile fluid is also presented. The locations of two isobaric invariant points in the study area have been identified by the intersection of the isograds and by determining the bracketing assemblages from above and below the invariant point. Data from this study suggest that the Sharbot Lake domain marble and associated rock in the area underwent regional metamorphism consistent with the greenschist- to amphibolite-facies conditions.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 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".