| 1. Domain | 1.1 Scope of the Domain | Boundaries | The range of phenomena the science includes and excludes. | Studies the geology of the ocean floor and the processes that shape it, including sediments, sedimentation, plate tectonics, seafloor spreading, volcanism, hydrothermal activity, submarine geomorphology, and past ocean conditions recorded in sediments. Excludes purely biological or chemical processes unless tied to geological structure or sediment formation. |
| | Scale | The spatial, temporal, or organizational level at which the science operates (e.g., quantum, cellular, social, cosmic). | Operates from mineral/particle scale → sediment grains → seafloor structures → basin-scale sedimentary systems → global plate-tectonic and paleoceanographic evolution. Timescales range from seconds (sediment resuspension) to millions of years (basin development). |
| 1.2 Ontological Commitments | Entities | The kinds of things assumed to exist within the domain (particles, organisms, agents, fields, etc.). | Sediment particles, minerals, microfossils, sedimentary layers, lithified deposits, submarine volcanoes, mid-ocean ridges, hydrothermal vents, seamounts, trenches, abyssal plains, methane hydrates, turbidity currents, sediment plumes. |
| | Properties | The fundamental attributes these entities possess (mass, charge, genotype, preference, etc.). | Grain size, composition, sorting, mineralogy, sedimentation rate, accumulation rate, porosity, density, magnetic properties, chemical composition, isotope ratios, thermal gradients, tectonic stress. |
| | Categories | The basic ontological types used to classify domain elements (substances, processes, relations, structures). | Sediment types (terrigenous, biogenic, hydrogenous, authigenic, volcanogenic), depositional environments (shelf, slope, abyssal plain), tectonic settings (MORs, trenches, hotspots), sedimentary structures, stratigraphic units, seafloor morphologies. |
| 1.3 State-Variables | Variables | The measurable or definable properties that describe system conditions. | Sediment thickness, accumulation rate, mineral/chemical composition, porosity, shear strength, temperature, heat flow, magnetic intensity, spreading rate, tectonic stress, bottom-current velocity. |
| | Parameterization | How variables encode and represent the system’s state. | States encoded by grain-size spectra, sediment cores, seismic-reflection profiles, heat-flow curves, magnetic lineations, stratigraphic ages, accumulation models, paleoenvironmental proxies (δ¹⁸O, δ¹³C). |
| 1.4 Admissible Idealizations | Simplifications | Conceptual reductions used to make the domain tractable (point masses, rational agents, perfect gases). | Uniform sedimentation, constant accumulation, steady spreading rates, simple layer stratification, neglect of bioturbation, ignoring small-scale topography, simplified mineral reactions, constant boundary conditions. |
| | Validity Conditions | The limits and contexts in which idealizations hold or break down. | Valid for large-scale reconstructions or deep-ocean settings; breaks down in active margins, rapidly changing depositional systems, high bioturbation zones, episodic events (turbidity currents), and hydrothermal alteration zones. |
| 1.5 Domain Assumptions | Structural Assumptions | Background ontological stances such as determinism, continuity, randomness, discreteness. | Sediments record past environmental and tectonic conditions; seafloor evolves through plate motions; stratigraphy reflects time-ordered deposition; physical and chemical properties obey natural laws; sediment transport follows hydrodynamic and gravity-driven processes. |
| | Implicit Commitments | Unstated but necessary assumptions that shape the field’s conceptual structure. | Assumes sediment preservation, datable stratigraphy, interpretable microfossil/chemical proxies, measurable tectonic/geophysical signals, and continuity of depositional processes across time. |
| 1.6 Internal Coherence Requirements | Consistency | The demand that domain concepts do not contradict one another. | Requires agreement among stratigraphy, sediment composition, seismic structure, tectonic reconstructions, paleoceanographic proxies, and geophysical data. |
| | Compatibility | The requirement that entities, variables, and assumptions fit together into a unified descriptive framework. | Must align with plate tectonics, sedimentology, stratigraphy, geochemistry, physical oceanography (currents), paleontology (biogenic sediments), and climate science in a unified Earth–ocean system framework. |
| 2. Evidence Layer | 2.1 Observable Phenomena | Observables | The aspects of the domain that can produce detectable signals accessible to measurement. | Sediment thickness, grain-size distributions, mineralogy, sediment accumulation rates, microfossil assemblages, seafloor morphology, magnetic lineations, seismic reflections, heat flow, hydrothermal plumes, turbidity currents, methane seeps, bioturbation structures. |
| | Detection Limits | The boundaries of what can be resolved or sensed by current instruments or methods. | Limited by seismic resolution, coring penetration depth, sediment-core disturbance, microfossil visibility, magnetic noise, resolution of side-scan sonar, depth limitations of ROV/AUV sensors, and inability to observe rapidly changing events continuously. |
| 2.2 Measurement Systems | Units | Standardized quantifications (meters, seconds, volts, decibels, dollars, etc.) necessary for consistent comparison. | Thickness (m), accumulation rate (cm/kyr), grain size (µm–mm), porosity (%), density (g/cc), temperature (°C), heat flow (mW/m²), magnetic intensity (nT), seismic velocity (m/s), sedimentation age (ka–Ma), spreading rate (mm/yr). |
| | Instruments | Devices and tools (microscopes, spectrometers, sensors, surveys, detectors) used to produce measurements. | Multicores, box cores, piston/gravity cores, sediment traps, XRF/XRD analyzers, SEM, mass spectrometers (for isotopes), seismic-reflection systems, side-scan sonar, multibeam bathymetry, magnetometers, heat-flow probes, ROVs/AUVs with sampling arms. |
| 2.3 Operational Definitions | Definitions | Terms defined by specific measurement procedures, ensuring empirical clarity. | Sediment type defined by provenance/composition; accumulation rate defined by core age-depth models; stratigraphic units defined by lithologic or proxy changes; spreading rate defined by magnetic-lineation spacing; hydrothermal plume defined by chemical/thermal anomaly above background. |
| | Procedures | The explicit steps required to perform a measurement in a reproducible way. | Core extraction and splitting, smear-slide preparation, grain-size analysis, radiometric dating, magnetic-susceptibility scans, seismic processing workflows, bathymetry cleaning, proxy extraction (δ¹⁸O, δ¹³C), CT scanning of cores, heat-flow measurement protocols. |
| 2.4 Data Acquisition | Protocols | Formal processes for gathering data under controlled or standardized conditions. | Seismic line acquisition, multibeam mapping, coring transects, sediment-trap deployments, AUV/ROV surveys, systematic dredging, long-term observatory sampling, repeated hydrothermal-plume mapping, lithologic logging. |
| | Sampling | Rules determining which subset of the domain is measured and how representative it is. | Multi-depth core stations, spatial transects across basins, replicate cores, subsampling of cores (temporal/depth intervals), grain-size fractionation, microfossil picking, paired geochemical–sedimentological samples. |
| 2.5 Data Character & Format | Data Types | The form raw evidence takes (time series, spectra, images, counts, qualitative records). | Core logs, lithologic descriptions, stratigraphic columns, grain-size tables, XRF counts, microfossil abundance tables, seismic profiles, magnetic anomaly maps, bathymetric grids, heat-flow curves, sedimentation-rate models, pore-water chemistry profiles. |
| | Resolution | The granularity or precision with which data is captured. | Determined by seismic frequency, core length/diameter, sampling interval, microfossil counting precision, bathymetric grid size, magnetometer sensitivity, CT-scan resolution, and proxy dating accuracy. |
| 2.6 Reliability & Calibration | Calibration | Adjustment procedures ensuring instruments produce accurate results. | Seismic source/receiver calibration, multibeam/side-scan corrections, magnetic diurnal correction, instrument-drift correction, core-catcher contamination checks, XRF standards, radiometric age calibration, heat-flow probe calibration. |
| | Error Characterization | Identification and quantification of noise, uncertainty, bias, and measurement error. | Coring disturbance, seismic noise, navigation errors, biofouling on sensors, dating uncertainty, incomplete recovery, magnetic overprints, sediment mixing (bioturbation), sensor drift, bias in visual core descriptions. |
| 3. Structural Layer | 3.1 Patterns & Regularities | Laws / Relations | Stable, repeatable patterns governing how observables behave across conditions. | Sedimentation follows Stokes’ settling laws; plate motion controls seafloor age; magnetic reversals produce symmetric magnetic stripes; sediment thickness increases with age/distance from spreading centers; turbidity currents follow gravity-flow dynamics; carbonate compensation depth governs CaCO₃ preservation. |
| | Invariants | Quantities or properties that remain constant under transformations (symmetries, conservation laws). | Conservation of mass in sediment budgets; stable seafloor–age relationships; repeated stratigraphic succession patterns; consistent microfossil–climate calibration curves; invariant heat-flow decay trends away from mid-ocean ridges; consistent basalt magnetic polarity patterns. |
| 3.2 Causal Architecture | Mechanisms | Underlying processes or structures that produce the observed regularities. | Plate tectonics, seafloor spreading, hydrothermal circulation, volcanic activity, chemical precipitation, biogenic sediment production, terrigenous input, gravity-driven flows, bottom currents, bioturbation, diagenesis. |
| | Pathways | Organized sequences of interactions forming a causal chain or network. | Weathering → river transport → coastal deposition → shelf–slope transport → deep-sea accumulation; magma upwelling → ridge volcanism → crust formation → hydrothermal alteration; biological production → particle sinking → burial → lithification → uplift/exposure. |
| 3.3 Theoretical Vocabulary | Concepts | Core terms that encode the domain’s structure (force, gene, equilibrium, field). | Seafloor spreading, subduction, abyssal plains, contourites, turbidites, CCD, lysocline, hydrothermal vents, stratigraphy, paleoceanographic proxies, sediment budgets, basin architecture, accretionary prisms. |
| | Classifications | Taxonomies, categories, or typologies that organize entities and relations. | Sediment types (terrigenous, biogenic, hydrogenous, volcanogenic), depositional environments (shelf, slope, abyss), tectonic settings (MOR, trench, hotspot), sedimentary structures (graded bedding, laminations), microfossil groups (forams, coccoliths, diatoms). |
| 3.4 Formal Representations | Equations | Mathematical constructs expressing laws, relations, or mechanisms. | Stokes’ settling equation; heat-flow decay (q ∝ 1/√age); sediment-accumulation equations; turbidity-current equations (momentum, density contrast); carbonate saturation equations; diffusion/compaction equations; plate-motion Euler-pole equations. |
| | Models | Structured representations—mathematical, computational, or conceptual—used to predict and explain phenomena. | Plate-tectonic reconstructions, sediment-transport models, basin-evolution models, diagenesis models, carbonate compensation models, seismic-velocity models, turbidite flow models, hydrothermal circulation models. |
| 3.5 Idealized Structures | Simplified Models | Purposeful abstractions that capture essential dynamics while omitting irrelevant detail. | Uniform sedimentation, constant spreading rate, no bioturbation, steady-state heat flow, homogeneous crust, simple layered stratigraphy, absence of currents, idealized basins, simplified grain settling. |
| | Limit Conditions | Regimes where specific models or approximations hold (classical vs. quantum, linear vs. nonlinear). | Fail at active margins, hydrothermal fields, zones of intense bottom currents, highly bioturbated sediments, variable sediment sources, carbonate dissolution zones, nonsteady deposition, and tectonically complex settings. |
| 3.6 Integrative Frameworks | Unifying Theories | Higher-order structures that connect disparate laws or mechanisms under a coherent whole. | Links plate tectonics → seafloor formation → sedimentation → paleoceanographic records → global change; integrates physical, chemical, and biological processes to interpret past and present seafloor evolution. |
| | Interdisciplinary Links | Points where the theory connects to adjacent sciences or larger explanatory systems. | Connects with physical oceanography (bottom currents), chemical oceanography (sediment geochemistry), biology (biogenic sediments), geophysics (seismic/magnetic structure), climate science (paleo reconstructions), and tectonics. |
| 4. Method Layer | 4.1 Inquiry Design | Experimental Design | Structured plans for manipulating variables to test causal claims. | Controlled sediment–water experiments (settling columns, flumes), manipulation of flow speed, grain size, density contrasts, hydrothermal fluid chemistry/temperature, and diagenetic conditions to test sedimentation, turbidity transport, alteration, and mineral precipitation. |
| | Observational Design | Systematic approaches for gathering non-manipulated data (surveys, field studies, natural experiments). | Systematic seafloor mapping, sediment-core collection, multibeam surveys, ROV/AUV transects, seismic profiling, plume tracking, and long-term observatory monitoring without artificial perturbation. |
| 4.2 Testing & Validation | Hypothesis Testing | Procedures for evaluating whether evidence supports or contradicts specific claims. | Comparing predicted sedimentation rates, stratigraphic boundaries, plume behavior, spreading rates, magnetic patterns, hydrothermal signatures, or facies distributions with seismic data, core chronologies, magnetic profiles, and geochemical signals. |
| | Replication | The requirement that results be independently reproducible under similar conditions. | Replicate coring at nearby sites, repeated seismic lines, repeat bathymetry surveys, duplicate grain-size analyses, repeated radiometric dating, replicate microfossil counts, and repeated XRF/XRD assays. |
| 4.3 Inference & Evaluation | Statistical Inference | Rules for drawing conclusions from noisy or incomplete data. | Estimation of uncertainties in sedimentation rate, accumulation age, magnetic polarity, heat flow, seismic travel times, facies boundaries, grain-size statistics, paleo-proxy values, and spreading-rate calculations; regression, spectral, and geostatistical analyses. |
| | Model Comparison | Criteria (fit, simplicity, predictive accuracy, robustness) used to evaluate competing models. | Evaluation of competing sediment-transport models, plate-tectonic reconstructions, diagenetic models, carbonate-dissolution models, hydrothermal-circulation models, and seismic-velocity models based on fit, predictive accuracy, and physical/geological plausibility. |
| 4.4 Error Management | Error Analysis | Identification and quantification of random and systematic errors. | Identifying core disturbance, incomplete recovery, dating uncertainty, seismic noise, navigation drift, magnetic contamination, sample contamination, pore-water alteration, misalignment of seismic sections, instrument drift, and inconsistent lithologic logging. |
| | Bias Control | Methods for minimizing subjective, instrumental, or procedural biases. | Use of blanks/standards in chemical analyses, multiple observers for core description, standardized seismic processing, repeated navigation crosslines, careful core-handling protocols, blind microfossil counts, and consistent sampling intervals. |
| 4.5 Adjudication & Revision | Peer Scrutiny | Collective evaluation of claims through critique, review, and debate. | Independent review of seismic interpretations, sedimentological logs, age–depth models, tectonic reconstructions, proxy interpretations, core descriptions, and plume mapping by separate teams or laboratories. |
| | Theory Revision | Procedures for modifying, replacing, or discarding models based on new evidence. | Updating tectonic models, revising sediment budgets, adjusting age–depth models, recalibrating paleo proxies, modifying spreading-rate interpretations, refining hydrothermal-circulation frameworks, and revising facies models when contradicted by new data. |
| 4.6 Integrity Conditions | Transparency | Requirements to disclose methods, data, assumptions, and limitations. | Full disclosure of core-recovery details, coring disturbances, navigation accuracy, seismic-processing steps, age-model assumptions, calibration procedures, sample-handling protocols, and data-exclusion criteria. |
| | Ethical Standards | Norms ensuring responsible conduct in experimentation, data handling, and publication. | Responsible sampling (minimal benthic impact), adherence to marine protected-area rules, accurate reporting of uncertainties, proper disposal of chemical wastes, transparent dataset sharing, and respect for international oceanographic sampling agreements. |