Zircon U-Pb geochronology and Hf isotope geochemistry of metamorphic quartz-monzonite porphyry from Tongkuangyu area, Zhongtiao Mountain and its geological implications
Bibliographic record
Abstract
The formation time of the metamorphic quartz-monzonite porphyry associated with the Tongkuangyu porphyry copper deposit is still controversy. A set of zircon U-Pb geochronology and in-stiu Hf isotopic date was presented in this study for the metamorphic quartz-monzonite porphyry. The result show that the discordia upper intercept age 2121 ± 10Ma and 207 Pb / 206 Pb age range from 2065Ma to 2196Ma,have a weighted average age 2117 ± 13Ma. This age ( 2117 ± 13Ma) is accounted as the formation time of the metamorphic quartz-monzonite porphyry from Tongluangyu porphyry copper deposit,and is approximately consistent with the extension of the North China Craton ( NCC) ,especially the activity of Zhongtiao rift which is located in the southern part of NCC. In addition,zircons Hf isotopic characteristics ( e Hf ( t) range from - 7. 79 to 0. 39) indicate that the old crustal materials played an important role in the petrogenesis. So,we conclude that the Tongkuangyu porphyry Cu deposit is a typical porphyry Cu deposit formed in inner continental settings,which genetic with the large-scale extension of the NCC.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 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".