Deep-Water Channel Run-Out Length: Insights from Seafloor Geomorphology
Bibliographic record
Abstract
Abstract: The seafloor provides high-resolution, but relatively static, perspectives of submarine sediment-routing systems, which can be employed in the development of predictive models of deep-water stratigraphic sequences. We compare 31 seafloor canyon-and-channel systems from predominantly siliciclastic continental margins and discuss their morphologic variability. The longest canyon-and-channel systems of this study generally correspond with relatively mature, passive continental margins associated with some of the largest deep-sea fans in the world with long-term, voluminous, mud-rich sediment supply. Shorter, lower-relief canyon-and-channel systems generally correspond with immature margins associated with relatively meager, sand-rich or mixed-caliber sediment supply. Seafloor continental-margin relief nonlinearly corresponds with canyon-and-channel-system length, with very high-relief margins exhibiting longer canyon-and-channel systems than predicted by a linear relationship. Nonlinearity in our observations can be accounted for by the increased occurrence and magnitude of submarine mass wasting in higher-relief and correspondingly longer canyon-and-channel systems, limitations of relief imposed by the maximum depths of ocean basins, and sediment-gravity-flow dynamics. These interpretations of controls on canyon-and-channel geomorphology represent extrinsic characteristics of land-to-deep-sea sediment supply and basin or continental-margin framework and intrinsic sediment-gravity-flow dynamics. We demonstrate that insights into seafloor channel processes, morphologic products, and scaling relationships can be broadly applied to predicting ancient subsurface and outcropping deep-water stratigraphic sequences. Our comparative analysis suggests that knowledge of the thickness of an ancient basin-margin stratigraphic sequence can be employed in order to generally predict the basinward extent of a paleo-canyon-and-channel system and underlying depositional fan. The application also potentially works in reverse: intimate knowledge of the deep-water component of a continental margin or basin margin can facilitate understanding of up-depositional-dip stratigraphic architectures where data might be lacking.
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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 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.020 | 0.002 |
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; both teacher heads agree on what is shown here.
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".