Petrogenesis of a TTG intrusive suite: the La Dauversière pluton, Abitibi greenstone belt, Canada
Bibliographic record
Abstract
Insights into the source and partial melting conditions of tonalite–trondhjemite–granodiorite (TTG) intrusive suites provide essential constraints on the tectonic regimes prevailing before 2.5 Ga. As case studies on individual suites increase, the TTG group becomes more heterogeneous, offering detailed insights into the evolution of the Archean crust. This study focuses on the La Dauversière pluton, a TTG suite in the Chibougamau area, Abitibi greenstone belt, Canada, to unravel complex differentiation processes in a pluton with a relatively limited volume. According to whole-rock and zircon chemistry, the La Dauversière pluton is a TTG suite that contains less Na and light rare earth elements (LREE) than other TTG suites of the Abitibi greenstone belt. Whole-rock chemistry and melt inclusions in zircon also point to an atypical fractional crystallization process that favors K enrichment, contrasting with the Na enrichment trends observed in most TTG suites globally. Magma hybridization, with late magma pulses interacting with early phases partially crystallized at depth, likely explains the chemistry of the La Dauversière pluton. The source of these magmas differs from the basaltic source that gave rise to most TTG suites of the Abitibi greenstone belt, possibly because older basement occurs in the Chibougamau area and is lacking in the rest of the greenstone belt. The La Dauversière pluton underscores the importance of interpreting the petrogenesis of individual TTG suites before inferring global source processes and geodynamic settings.
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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 | 0.003 | 0.003 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 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".