The biogeochemical interaction and alteration of hydrocarbons in shallow sediments of the Scotian Slope, Nova Scotia
Bibliographic record
Abstract
This thesis presents findings from a study on headspace gas and methane clumped isotopic data obtained from various core samples along the Scotian Slope of Nova Scotia.The research aimed to quantify i) gas loss during sample storage, ii) evaluate the effectiveness of frozen sediment cores in identifying the sulfate methane transition zones, and iii) understand the origins and mechanisms of hydrocarbon gases at deep marine, cold seep sites.Results indicated an average of 75% gas loss for Isojars during the first nine months of storage, emphasizing the importance of proper preservation techniques.Optimal conditions for sample analysis were established, aiding in methane core profile construction for identifying shallow sediment, geochemical transition zones.Methane clumped isotopologue analysis revealed a deep biosphere approximately one kilometer below the seabed, sustained by microbial gas production, supporting seep sites near salt diapirs.This study highlights the significance of direct seep gas samples and provides insights into methane dynamics in marine environments and how deep biosphere methane gas production can impact ocean floor community ecology in diapir controlled cold seep localities.
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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 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".