Analisi delle associazioni a Nannofossili calcarei di età eocenica inferiore e media del Site U1410 \n(Newfoundland Ridge, NO Atlantico): un approccio integrato
Bibliographic record
Abstract
This Master thesis is the biostratigraphic, biocronologic and isotopic study of a sedimentary succession retrivered during the Expedition IODP 342 at Site U1410 (Newfoundland Ridge, North-western Atlantic Ocean). The biostratigraphic study of calcareous nannofossils assemblages allows for the construction of a precise biostratigraphic framework based on the recognition of the first and last appearance of the several taxa. The age model of the study section indicates that the sediments were deposited during the early Eocene (52.6 to 48.0 Ma) spanning an interval of ca. 4.5 Myr. \nAccording to the biozonations available, the study extends from Zone NP11 to Zone NP14 (Martini, 1971), from Subzone CP9b to Subzone CP12b (Okada & Bukry, 1980) and from Zone CNE3 to Zone CNE7 (Agnini et al., 2014). \nAlong the study section, calcareous nannofossils assemblages display a major change, which consists of the first appearance of genera Dictyococcites and Reticulofenestra. This change coincides with the Early Eocene Climatic Optimum (ca. 52-50 Myr) represents a major step toward the establishment of the present day calcareous nannofossils assemblages. \nThe integration of oxigen and carbon stable isotope with calcareous nannofossils relative abundance data permits to frame the observed paleontological changes in a high resolved paleoclimatic scenario. \nThe CaCO3 curve evidences for a remarkable litological change, from pelagic carbonate-rich sediments (nannofossils ooze) to hemipelagic clay-rich terrigenous sediments. This change occured at the early to middle Eocene transition (ca. 48 Myr) and likely documents the onset of Atlantic Deep Western Boundary Current that has flowed off the eastern coasts of North America since then.
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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) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.006 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| 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 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".