Crystallization conditions and magmatic–hydrothermal evolution of syenite dykes spatially associated with gold mineralization: the example of the Dolodau syenite–carbonatite complex, Abitibi greenstone belt
Bibliographic record
Abstract
The Dolodau syenite–carbonatite complex is one of several syntectonic intrusions of the Abitibi greenstone belt, Superior craton, Canada. It formed during the syntectonic period, which is the main deformation stage leading to craton stabilization. Such magma can be involved in intrusion-related gold systems (IRGS) and be overprinted by orogenic gold systems (OGS), with IRGS and OGS being the main gold mineralizing systems of the syntectonic period. Determining whether magmas of the syntectonic period can transport enough gold to fertilize the upper crust requires insights into the crystallizing conditions and the volatile content of these magmas. Retrieving such data from the altered rocks generally encountered in mineralized areas is best accomplished by accumulating case studies. This study focuses on the Au–W–Ag mineralization spatially associated with the Dolodau intrusive complex to evaluate its fertility for Au. Using field relationships, petrographic observations, whole rock geochemical analyses, and mineral chemistry (titanite, apatite), we show that Dolodau is a carbonatite–syenite–granodiorite intrusive suite that crystallized rapidly at shallow depth in an active fault zone. The magma was S- and Cl-poor according to apatite chemistry, and it was likely incapable of transporting a significant amount of gold through the crust. It is concluded that the Dolodau Au–W–Ag mineralization is an OGS related to a major northeast–southwest-oriented fault.
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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 | 0.001 |
| 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) | 0.000 | 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 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".