New SHRIMP U-Pb zircon geochronology for the central Pine Creek Orogen, Northern Territory: implications for Top End orogenesis
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Bibliographic record
Abstract
The Palaeoproterozoic Pine Creek Orogen, northern Australia, forms part of the North Australia Craton, and is a highly prospective terrain, with abundant mineral occurrences including gold and uranium. Geologically, it comprises sedimentary sequences deposited on rifted Archaean basement that were deformed, metamorphosed, and intruded by granitoids and mafic bodies during the ca. 1880-1850 Ma Nimbuwah Event, one of the constituent events of the Barramundi Orogeny.The stratigraphy of the central Pine Creek Orogen is well-characterised due to its extensive exposure, preservation, and low grade greenschist facies metamorphism. It contains units suitable for isotopie dating, permitting determination of absolute ages within a well-controlled stratigraphic framework. We present new zircon U-Pb SHRIMP results for volcanics and volcanogenic strata from various intervals within the pre-orogenic stratigraphy. These data: (a) indicate the presence of volcanic activity in the Pine Creek Orogen at ca. 2025 Ma; (b) provide revised constraints on the tectono-thermal evolution of the Pine Creek Orogen, specifically a revision of the Nimbuwah Event by some 20 Ma; (c) suggest that volcanism was widespread across the Pine Creek Orogen at ca. 1860 Ma; and (d) permit assessment of relative deposition rates of and time intervals between deposition of the Palaeoproterozoic stratigraphic sequences.
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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