U‐Pb geochronology and geochemistry of molybdenum‐bearing granodiorite porphyry at Copperstain Creek, west Nelson, New Zealand
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Bibliographic record
Abstract
Abstract A molybdenite‐mineralised granodiorite porphyry at Copperstain Creek has a U‐Pb zircon age of 133.5 ± 0.2 Ma. This is older than the Early Cretaceous (126–105 Ma) Separation Point Suite, with which other molybdenum‐bearing granodiorite porphyries in west Nelson have been correlated on the basis of similar compositions and K‐Ar ages. The Copperstain Creek granodiorite differs compositionally from the high Na and Sr/Y rocks of the Separation Point Suite in having medium Na and low Sr/Y. Oxygen isotope δ 18 O magma values of ≤10‰ for the Copperstain Creek granodiorite and granites from the Separation Point Suite indicate that both are I‐type granites. However, the Copperstain Creek granodiorite porphyry has a minimum δ 18 O magma value of 9.4‰, which indicates a magma with a crustal component, whereas the Separation Point Suite granites have values (5.4–7.9‰) which are very primitive (“mantle‐like”). These new U‐Pb age and oxygen isotope data indicate that the Copperstain Creek granodiorite is not related to the Separation Point Suite granitoids.
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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) | 0.001 | 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 it