Fault geometry as evidence for inversion of a former rift basin in the Eastern Lachlan Orogen
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Bibliographic record
Abstract
Reactivated faults have controlled the inversion of an inferred rift basin formed on weakly attenuated Silurian crust of the Eastern Lachlan Orogen. These included north‐trending faults, considered part of the rift‐related extensional faulting and silicic volcanism (Snowy River Volcanics), and northeast‐trending Silurian inverted faults in the Ordovician and Silurian basement rocks. The elongate, largely north‐trending Lower Devonian Snowy River Volcanics, and limestone and mudstone sequences of the Buchan Group now reflect ϵ20–30% east‐west buckle shortening in the rift sequence (Murrindal Synclinorium) and 10% fault shortening due to reactivation of basement faults (Emu Egg Fault and East Buchan faults). Faults generally have steep dips, older over younger movement sense, and varying dip directions along their lengths. A peculiar fault geometry that shows faults changing dip direction laterally about segments of vertical fault dip suggests fault reactivation. This geometry requires a scissors‐type rotational motion in the fault plane with increasing displacement away from fault segments with vertical dip (pivot points). Zones of steep fault dip are characterised by marked folding in the footwall and hanging wall where shortening has been accommodated by folding rather than by fault displacement. Such geometries are not typical of faults in fold‐ and thrust‐belts (e.g. Canadian Rocky Mountains and Appalachian Valley and Ridge Province). These faults show similarities with inverted extensional faults in the High Atlas of Morocco and in the extensional fault patterns in the offshore Otway Basin of southwest Victoria. Along with the silicic volcanism, they reflect continental rifting or pullapart of the Eastern Lachlan Orogen during Early Devonian times.
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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 | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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