Geological characteristics and enrichment mechanisms of the Huayagou-Jinchanggou Au Deposit: Implications for ore genesis in the Baguamiao-Jiutiaogou anomaly belt
Bibliographic record
Abstract
Significant breakthroughs have recently been made in the Huayagou-Jinchanggou area of the Western Qinling Orogen (WQO), with estimated Au reserves of 20 t. However, the genetic relationship between magmatism and mineralization, as well as the mechanisms responsible for ore enrichment, remain unresolved. The Jinchanggou Au deposit, characterized by super-rich ores and multiphase magmatism, provides a valuable opportunity to clarify these issues. In this study, we investigated mineralization-related diorite dykes through zircon LA-ICP-MS U-Pb dating, mineralogical geochemistry, EPMA analyses, and elemental mapping of bismuth minerals in auriferous quartz veins. The results show that the diorite dyke was emplaced at ca. 211.8 Ma and is characterized by moderately high oxygen fugacity and water content, consistent with magma mixing as indicated by the abundance of acicular apatite. Multiple episodes of such intrusions released magmatic-hydrothermal fluids that contributed to gold enrichment. The quartz-vein-type ores at Jinchanggou, particularly late-stage gently dipping veins, differ from the regionally common disseminated-type ores and display features of orogenic gold systems with a magmatic-hydrothermal overprint, comparable to deposits such as Val-d’Or (Canada) and Shuangqishan (China). Combined with geophysical and metallogenic data, these features suggest that mineralization is linked to Yanshanian metallogeny, a rare event in the WQO. This study provides new evidence for multi-pulsed magmatic contributions to mineralization and highlights the potential for deeper mafic dyke-related gold mineralization along the Baguamiao-Jiutiaogou anomaly belt.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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) | 0.000 | 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".