The Minas Azules Deposit—An Example of Orogenic Lode Gold Mineralization in the Sierra de Rinconada, Northern Argentina
Bibliographic record
Abstract
Abstract The Minas Azules gold deposit, located in the northernmost part of the Sierra de Rinconada, Argentina, is hosted by low-grade metamorphosed turbidites of Middle Ordovician age. Quartz veinhosted, stockwork and disseminated gold mineralization is structurally controlled and intimately associated with a large cylindrical-type anticline that developed during the Upper Ordovician-Lower Silurian Ocloyic orogeny. Several styles of gold-bearing quartz veins were emplaced during folding and the later stages of episodic thrust faulting, but the main gold mineralization episode occurred at a particular stage in the deformation history and can be shown to be related to pressure solution reactions that occurred following cleavage development and prior to the onset of transpressional deformation. Due to post-ore faulting, mineralization is confined entirely to the eastern flank of the Minas Azules anticline. Petrological and geochemical studies reveal that, within the eastern flank, hydrothermal alteration of the wallrock is well-developed and, together with low-grade disseminated mineralization, extends for at least 70 meters from the vein system. Alteration in the Minas Azules deposit includes chloritization, sericitization, (de)silicification, sulfidation, and carbonatization. Lithogeochemical changes related to alteration are characterized by the addition of K2O, CO2, As, Au, S, and concomitant depletion of SiO2, MgO, and Na2O. Based on the style of mineralization, relative timing of ore formation, and characteristic alteration features, the Minas Azules deposit bears many similarities with well-documented orogenic gold deposits in Phanerozoic fold belts elsewhere (e.g., Tasmanides, eastern Australia; Meguma Terrane, Nova Scotia; Tien Shan, Central Asia; Mongol-Okhotsk fold belt, Russian Far East) and highlights the potential of the Sierra Rinconada as a significant producer of orogenic lode-gold and disseminated mineralization in the Andes.
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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 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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".