The Kelly Dyke swarm, Pilbara Craton: a 3317 Ma large igneous province?
Bibliographic record
Abstract
A. Peterssona* , A. I. S. Kempb & S. W. Denyszynbc a Department of Geosciences and Natural Resource Management (Geology Section), University of Copenhagen, Copenhagen K, Denmarkb School of Earth Sciences, The University of Western Australia, Perth, Australiac Department of Earth Sciences, Memorial University of Newfoundland, St. John’s, NL, CanadaEditorial handling: Anita AndrewSupplemental data for this article are available online at https://doi.org/10.1080/08120099.2023.2126007CONTACT A. Petersson ape@ign.ku.dk Department of Geosciences and Natural Resource Management (Geology Section), University of Copenhagen, Copenhagen K, DenmarkAbstractWhile the onset of plate tectonics has been proposed as far back in time as the Hadean, there is no evidence for rigid crust that can accommodate linear dyke swarms until ca 2700 Ma in the Pilbara Craton, and at ca 2500 Ma in most other Archean cratons. Here, we provide a precise 3317.0 ± 1.1 Ma baddeleyite U–Pb ID-TIMS age determination for a dolerite from a regionally extensive dyke swarm underlying the Euro Basalt in the East Pilbara Terrane, with links to the Kaapvaal Craton that would establish it as part of what may be the oldest large igneous provinces on Earth. We link this event to the deposition of large volcano-sedimentary basins, reflecting the brittle fracturing that enables emplacement of the dyke swarm and the overlying thick succession of mafic-to-ultramafic lavas. This is the first time that a dyke swarm has been used as evidence for rigid crust prior to 3000 Ma, suggesting that lithospheric conditions appropriate for some form of plate tectonics existed at least as far back as the Paleoarchean. KEY POINTSWe provide a precise 3317.0 ± 1.1 Ma baddeleyite U–Pb ID-TIMS age determination for a dolerite in the Pilbara Craton.The dated dyke is part of the potentially oldest large igneous province on Earth.The dolerite dyke swarm was emplaced into rigid crust at ca 3.32 Ga.Lithospheric conditions that accommodated plate tectonics existed as least as far back as the Paleoarchean.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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 source (direct Gemma or distilled Codex), 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".