Ongoing Neotectonic Activity in the Timiskaming ─ Kipawa Area of Ontario and Québec
Bibliographic record
Abstract
The Timiskaming Graben lies along the border of Ontario and Quebec within the Western Quebec Seismic Zone – a conspicuous belt of heightened intracratonic seismic activity in eastern Canada. The graben forms a prominent 50-km wide fault-bounded morphotectonic depression partly filled by Lake Timiskaming (ca. 100 km long and 200 m maximum depth). This lake is a postglacial successor to the much larger glacial Lake Barlow, which drained about 8000 years ago, leaving an extensive clay plain (Little Clay plain). Some 1000 kilometres of high resolution seismic sub-bottom data collected from Lake Timiskaming reveal that both late-glacial Barlow and postglacial Holocene sediments are extensively deformed by neotectonic horst and graben structures. The bathymetry of the lake floor is structurally controlled by faulting; graben basins record enhanced postglacial subsidence between parallel bounding faults, one of which is expressed onshore on the surrounding clay plain as a 20-km long, 10-m high scarp. These structures indicate ongoing neotectonic activity on a scale not recognized elsewhere across intracratonic North America. Seismic reflection data confirm the Timiskaming Graben as an intraplate ‘weak zone’ that may contain a long, late Cenozoic sediment record. A program of deep continental drilling within the Timiskaming Graben and extension of the current program of investigating lake-floor geology across the many lakes of the Western Quebec Seismic Zone are now needed. SOMMAIRE Le graben de Temiscamingue est situe le long de la frontiere entre le Quebec et l’Ontario, au sein de la Zone sismique de l’Ouest du Quebec – une zone notable de plus grande activite sismique intracratonique de l’est du Canada. Le graben forme une depression morphotectonique de 50 km de largeur delimitee par des failles, partiellement remplie par le lac Temiscaminque (environ 100 km de long et une profondeur maximale de 200 m). Ce lac est le successeur postglaciaire du lac Barlow, bien plus grand, qui s’est draine il y a 8 000 ans environ, exposant une grande plaine alluvionnaire argileuse (plaine de Little Clay). Quelques 1 000 km de donnees sismiques haute resolution des couches proximales du fond du lac Temiscamingue montrent que tant les sediments holocenes de la fin du lac glaciaire Barlow que les sediments postglaciaires sont considerablement deformes par des structures neotectonique de horst et graben. La bathymetrie du plancher du lac est structurellement determinee par la formation de failles; les bassins de graben ont enregistre un accroissement de la subsidence postglaciaire entre les failles bordieres, et l’une d’elle se manifeste par un escarpement exonde de 10 m de hauteur sur 20 km de longueur qui surplombe la plaine alluvionnaire environ-nante. Ces elements structuraux sont l’indication d’une activite neotectonique persistante, a une echelle qui n’existe nulle part ailleurs dans le craton nord-americain. Les donnees de sismique reflexion confirme que le graben de Temiscamingue est une zone de « faiblesse » intraplaque qui pourrait renfermer un registre sedimentaire Cenozoique etendu. Il faut maintenant lancer un programme de sondages continentaux profonds a travers le graben de Temiscamingue et prolonger l’actuel programme d’etude geologique des fonds des lacs de la Zone sismique de l’Ouest du Quebec.
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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 | 0.000 |
| 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".