A textural and mineralogical study of the footwall rocks to the Sudbury Igneous Complex (North and East ranges)
Bibliographic record
Abstract
In the North and East range footwall rocks of the 1.85 Ga Sudbury Igneous Complex (SIC), quartz and \nplagioclase (An20-30), plastically deformed prior to the emplacement of the SIC, were thermally \nannealed, resulting in their replacement by aggregates of strain-free grains that coarsen towards the SIC \nfootwall contact due to radiant heat. In the Victor footwall deposit, SIC East Range, granoblastic \npolygonal quartz was overprinted by dynamically recrystallized quartz, with microstructures indicative \nof bulging (BLG) recrystallization. Incipient melting at quartz-plagioclase interfaces in Victor footwall \nrocks is recorded as interstitial plagioclase seams in quartz with quartz-quartz-plagioclase dihedral \nangles that peak at ~40 ⁰, characteristic of wetting angles. Subsequent fluid-mediated modification of \nleast-altered plagioclase (An20-30) generated porous albite (An0-10) through a coupled dissolutionprecipitation (CDP) mechanism, which was likely contemporaneous with the crystallization of \nsecondary epidote-group minerals. In the Victor footwall, textures and mineral chemistry of plagioclase, \nepidote- and chlorite-group minerals support the notion that a relatively oxidized, acidic, Fe-bearing \nfluid with a temperature of ~310 – 385 ⁰C favoured quartz-plagioclase interfaces as grain-scale fluid \npathways, preferentially dissolving the anorthite component of plagioclase and creating void space prior \nto formation of disseminated chalcopyrite proximal to massive Cu-rich sulfide veins in the footwall \nsetting.
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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 | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".