Receiver function analysis of the North American crust and upper mantle
Bibliographic record
Abstract
Data from 27 permanent broad-band stations spread over North America and sampling diverse tectonic regimes of varying ages from the Archaean to the Phanerozoic, were analysed using the receiver function approach. Receiver functions, a few hundred at most of the locations, provide valuable constraints on the composition of the crust shaped by diverse processes characteristic of their time of formation. The chemically inert and stable nature of the Archaean domains of Canada is well manifested in their low Poisson ratio (0.26, felsic, lower than global averages for Precambrian age crust) accompanied by a thicker than global average (>35 km) Archaean crust. Data from the Canadian Cordillera and Innuitian orogens of Phanerozoic times indicate the possible operation of two distinctly different crustal processes resulting in thin crusts (<35 km) with dominantly felsic and more mafic compositions, respectively. These processes are restricted to the region above 410 km without disturbing the integrity of the mantle transition zone (MTZ), which is evident from the remarkably homogeneous nature of the 410 and 660 km discontinuities beneath the Canadian landmass. Contrastingly, the thermally complex Phanerozoic southern California region suggests the presence of a heterogeneous mantle transition zone possibly owing to localized 660 topography with a relatively uniform 410 overlain by a crust heterogeneous in composition and perhaps maturing to that of a continent.
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 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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 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 | 0.001 |
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".