Lithostratigraphic Summary For Leg 175: Angola-Benguela Upwelling System
Bibliographic record
Abstract
During Ocean Drilling Program Leg 175, 40 holes were drilled at 13 sites, and 8003 m were recovered with the aim of \nreconstructing the late Neogene history of the Angola-Benguela upwelling system on the southwest African margin. This system \nis one of the great upwelling regions of the world and is characterized by organic-rich sediments that provide an excellent \nrecord of productivity back to the middle Miocene. Understanding the sedimentology and stratigraphy of these sediments will \nprovide important new information on the paleoceanography of this region, including the complex role the ocean plays in global \ncarbon cycling and climate change. \nThis contribution summarizes the sedimentologic and stratigraphic data compiled on board the JOIDES Resolution between \n12 August and 10 October 1997. The 13 drill sites can be divided into four regions based on sediment type and composition: (1) \nthe Lower Congo Basin, (2) the Angola Basin, (3) the Walvis Ridge and Basin, and (4) the Cape Basin. The stratigraphy of each \nregion is distinct and records the competing influences of current regime, shelf topography, and proximity to major river systems \n(both ancient and modern) and upwelling centers. The Lower Congo Basin is a hemipelagic environment containing finegrained \nsediments derived from the Congo River. Sedimentation within the Angola Basin is dominated by rain-out of hemipelagic \nsilts and clays derived from coastal erosion and from the Kunene River to the south. Sediments within the Walvis Ridge \nand Basin consist of carbonate oozes and organic-rich clays, which record a strong upwelling signal from the Benguela Current. \nDeposition in the Cape Basin is dominated by pelagic settling of biogenic debris at the most southern tip of the Benguela Current \nupwelling center.
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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 | 0.002 | 0.003 |
| Science and technology studies | 0.003 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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".