Proceedings of the Ocean Drilling Program Volume 205 Initial Reports: Fluid Flow and Subduction Fluxes across the Costa Rica Convergent Margin: Implications for the Seismogenic Zone and Subduction Factory, Sites 1253–1255
Bibliographic record
Abstract
This Initial Reports volume covers Leg 205 of the cruises of the Drilling Vessel JOIDES Resolution, Victoria, Canada, to Balboa, Panama, Sites 1253–1255, 2 September–6 November 2002. Costa Rica is an important area for studies of the seismogenic zone and subduction factory for several reasons. As one of the few modern arcs subducting a carbonate-rich sediment section, Central America permits study of CO2 recycling through a subduction zone. Changes along strike in seismicity, plate coupling, and volume and composition of the arc lavas (between Nicaragua and Costa Rica) appear to correlate with changes in sediment dynamics. The balance between sediment accretion, underplating, erosion, and subduction may ultimately result from changing bathymetry, thermal structure, or hydrological behavior along the margin. Science objectives for Leg 205 had two primary foci, both related to seismogenic zone and subduction factory questions. The first was to determine the igneous and alteration history of the uppermost part of the downgoing plate at reference Site 1253, along with the inferred distribution of fracture permeability in the core and borehole. The second was to characterize and monitor two of the three hydrological systems inferred from Leg 170 results: in basement at Site 1253 and along the décollement (or upper fault zone) at Sites 1254 and 1255. These goals were accomplished by (1) targeted coring of selected intervals, (2) downhole temperature and pressure measurements, (3) logging at Site 1253, and (4) installation of long-term observatories (CORK-IIs) to monitor temperature and pressure and to sample fluids and gases in each of the hydrologic systems. In the décollement zone, instruments were also deployed to attempt to measure fluid flow rates. Temporal variation of fluid composition in the sealed-off intervals will be obtained using osmotic fluid samplers. The samplers and temperature loggers will be recovered for analysis 1 to 2 years after installation, pressure data will be downloaded, and new samplers and temperature probes will be installed.
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.008 | 0.002 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 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".