The sedimentary structure between the Mendeleev and \nLomonosov ridges, Arctic Ocean
Bibliographic record
Abstract
During the RV Polarstern cruise ARK-XXIII-3 in summer of 2008, geophysical data of a \nnearly 1200 km long seismic transect along 81 N including the Amundsen Basin, Lomonosov \nRidge, Makarov Basin, Mendeleev Ridge and Canada Basin could be acquired. The objective \nwas to understand the tectonic evolution of the Makarov Basin in relation to the evolution \nof the adjacent Lomonosov and Mendeleev ridges in the Amerasia Basin. \nThe data acquisition involved seismic reection and refraction data, gravity, bathymetry, \nand magnetics. The seismic survey set-up included a 300 m streamer and a 32 liter airgun \ncluster. Because of ice conditions, gaps remained between the proles but for the rst time \nit was possible to get a nearly complete overview over the three main features within the \nArctic Ocean. \nIn addition to reection seismic data, eight sonobuoys were deployed along the proles to \nbetter resolve the seismic velocities in the sedimentary column. \nThe seismic sections are dominated by an unconformity that persists across the entire transect \nand that separates the at-lying well-stratied upper unit of Cenozoic age from the \nlower Mesozoic sediment sequences, which are dominated by pervasive normal faulting. The \nunconformity marks the break-up of the Lomonosov Ridge from the Siberian/Barents shelves \nbetween 56-65 Ma ago. \nThe developed velocity depth functions indicate sediment thicknesses from 1200-2000 m on \nthe Lomonosov Ridge to 5500-6300 m within the deepest point of the Makarov Basin around \n168 E, to 1000-1500 m on the western ank of the Mendeleev Ridge, to 4000 m within \nthe Canada Basin. The continental origin of the Lomonosov Ridge could be approved. The \nfact that evidences for oceanic origin are missing leads to the assumption that the Makarov \nBasin is created only by extension of continental crust between the opening of the Canada \nBasin and the initiation of the Eurasia Basin, 120 - 56 Ma ago. However, the possibility of a \npartly oceanic crust can not be ruled out. The high velocities of the basement (> 6.4 km/s), \nthe density characteristics and the uniform crust within the 2D gravity modeling leads to \nthe conclusion that the Mendeleev ridge has an oceanic origin. The modeled thick crust (33 \nkm) could be explained by the theory of a Large Igneous Province (LIP) around 89 Ma ago. \nAll interpretations support the rotational models.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 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".