Regional geophysical investigation of the Sudbury structure
Bibliographic record
Abstract
The ca. 1850 Ma Sudbury structure (SS) lies in the Canadian Shield at the paleocontinental margin between the Archean Superior province and the Proterozoic Southern Province. It comprises the Sudbury Igneous Complex (SIC), underlying brecciated footwall rocks, and the overlying sedimentary sequence of the Whitewater Group that occupy the central depression of the SIC. Having gone through a series of syn- and post-formation orogenies, the hypothesized initial circular shape of the SIC has been deformed into an elliptical shape of about 28 km by 60 km. Contacts qualitatively interpreted from the computed directional and tilt derivatives of the magnetic field are mostly coincident with the mapped geological contacts, especially in the North Range, but show some inconsistencies in the South Range probably due to extensive alteration and deformation processes. Interpreted magnetic lineaments further highlight the continuity of some previously known faults and dykes and also revealed some new lineaments probably buried or otherwise obscured. Two-and-a-half dimensional joint magnetic and gravity forward modelling consistent with the magnetic contacts and a new interpretation of the Lithoprobe seismic section incorporated a north-verging fold into the basal portion of the SIC in the South Range. The location of the basal deformation is coincident with and could be related to a linear gravity high observed within the Sudbury Basin. Geological interpretation along six profiles was used to develop a three-dimensional geological model of the Sudbury structure and forward gravity computation suggests the existence of a dense feature, interpreted to be mafic volcanic rocks of the Elliot Lake Group, at about 5-6 km depth under the Sudbury Basin. Sulfide-rich sublayer norite could lie above this deformed zone, suggesting it to be a deep prospective zone for future investigation. Northwest-directed closure and reversal of the Huronian rift basin during the Penokean orogeny is suggested to explain the development of \niv \nstructures at the base of the SIC. This interpretation is consistent with most reflectors of the Lithoprobe seismic section.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 | 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) | 0.001 | 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 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".