Influence of pre-existing structures on the emplacement and deformation of Late-Jurassic rift related magmatism in Newfoundland, Canada
Bibliographic record
Abstract
The Notre Dame Bay Magmatic Province (NDBMP) comprises a suite of Late Jurassic (Tithonian), rift-related alkaline mafic intrusions in north-central Newfoundland, Canada. This field-based study focuses on the Leading Tickles area, where the gabbroic Budgell’s Harbour Stock (BHS) and radial lamprophyre dykes intrude strongly folded and faulted Ordovician back-arc volcanic and sedimentary host rocks. The primary objective was to understand how pre-existing structures influenced the emplacement and post-intrusion deformation of the NDBMP. This thesis employs a comprehensive methodology, including field mapping, thin section analysis, stereographic projections, kinematic and dynamic analysis, GIS visualization, and 3D analog modelling to analyze the interactions between pre-existing structures and the NDBMP. The results reveal that lamprophyres preferentially exploited pre-existing Paleozoic Appalachian structures associated with the Iapetus Suture Zone. Furthermore, magmatic activity weakened and deformed the host rocks, leading to the reactivation of Silurian thrust faults that deformed the lamprophyres post-intrusion. Movement along Luke’s Arm Fault Zone (LAFZ) in Leading Tickles may indicate a broader reactivation of the Iapetus Suture in northern Newfoundland during the Mesozoic. The variation in lamprophyre mineralogies and the presence of numerous radial dyke clusters suggest multiple magma sources coinciding with regional antiforms.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.002 | 0.000 |
| Open science | 0.001 | 0.001 |
| 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 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".