10.1016/s0967-0653(98)80338-4
Bibliographic record
Abstract
Ice-sheet sourced Pleistocene turbidite systems of the Labrador Sea are different from non-glacially influenced systems in their facies distribution and depositional processes. Two large-scale sediment dispersal systems are juxtaposed, one mud-dominated and associated with the Northwest Atlantic Mid-Ocean Channel (NAMOC), the other sand-dominated and forming a huge submarine braided sand plain. Co-existence of the two systems reflects grain-size separation of the coarse and fine fractions on an enormous scale, caused by sediment winnowing at the entrance points of melt-water from the Laurentide Ice Sheet (LIS) to the sea (Hudson Strait, fiords) and involves a complex interplay of depositional and redepositional processes. The mud-rich NAMOC system is multi-sourced and represents a basinwide converging system of tributary canyons and channels. It focusses its sand load to the central trunk channel in basin centre, in the fashion of a reverse deep-sea fan.The sand plain received its sediment from the Hudson Strait by turbidity currents that were generated either by failure of glacial prodelta slopes at the ice margin, or by direct meltwater discharges with high bedload concentration. We speculate that the latter might have been related to subglacial-lake outburst flooding through the Hudson Strait, possibly associated with ice-rafting (Heinrich) events. Resume Les depots turbiditiques pleistocenes d'origine glaciaire de la mer du Labrador different d'autres depots turbiditiques non-glaciaires, autant par leurs facies que par leurs processus de sedimentation. Deux grands complexes de depots sedimentaires se jouxtent, l'un comprenant surtout des sediments a grains fins, relie au Chenal Medio-Oceanique de l'Atlantique nord-ouest (CMNOA) et l'autre, comprenant surtout des sables et formant une gigantesque plaine a chenaux anastomosee sous-marine. La co-existence de ces deux systemes reflete la separation par taille des grains des fractions grossieres et fines sur une echelle enorme et est le resultat de l'action d'un gigantesque mecanisme de vannage, existant aux points d'entree des eaux de fonte de la calotte glaciaire des Laurentides (CGL) dans la mer (detroit de Hudson et fiords) et qui est a l'origine de processus complexes de sedimentation et de re-sedimentation. Le complexe riche en boues de CMNOA s'alimente a plusieurs sources et agit a l'echelle du bassin ou convergent les apports sedimentaires de nombreux canyons et chenaux tributaires. Il concentre la portion sableuse de sa charge dans le chenal central, au centre du bassin, a la facon d'un eventail sedimentaire profond inverse. Les sediments arrivent a la plaine d'epandage par le detroit de Hudson, transportes par des courants de turbidite declenches par des ruptures des pentes prodeltaiques glaciaires a la bordure de la marge glaciaire, ou par les eaux de fontes a fortes charges de fond ; ce dernier type d'apport aurait pu etre lie a une rupture de lac sous-glaciaire par le detroit de Hudson, et possiblement associe a des evenements Heinrich.
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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 | 0.000 | 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) | 1.000 | 1.000 |
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; 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".