Anatomy, emplacement and evolution of a shallow-level, post-tectonic laccolith: the Mt Disappointment pluton, SE Australia
Bibliographic record
Abstract
Abstract: The Late Devonian, high-level, post-orogenic Mt Disappointment pluton was emplaced as a nested laccolith. Field observations and magnetic fabric (anisotropy of magnetic susceptibility) data show that the monzogranitic to granodioritic magmas entered the pluton from a central, linear feeder. The first set of magmas solidified to a non-megacrystic unit and the second to a unit carrying K-feldspar megacrysts. Emplacement was accommodated partly by uplift of the overburden on brittle marginal faults. The magmas were produced through mid- to deep crustal (<600 MPa) partial melting of a source containing both ‘igneous' and ‘sedimentary' rocks, possibly a package of volcaniclastic and aluminous metagreywackes. The spectrum of magma compositions was not formed through any differentiation or magma mixing process. At the source, the melt compositions varied as a result of mixing between liquids derived from the two main source rocks, with variations in the amount of plagioclase component that entered the melt. The degree of entrainment of peritectic orthopyroxene and ilmenite appears to have controlled the Fe, Mg and Ti contents of the magma batches. A variety of evidence suggests that magma withdrawal from the protolith was rapid and episodic. The magma batches so formed were emplaced into the growing pluton essentially without further chemical evolution.
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 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".