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Niessen, Frank; Jarrard, Richard D; Bücker, Christian J (1998): Physical properties of sediment core CRP-1 [dataset]. PANGAEA,, Supplement to: Niessen, Frank; Jarrard, Richard D (1998): Velocity and porosity of sediments from CRP-1 drillhole, Ross Sea, Antarctica. Terra Antartica, 5(3), 311-318, hdl:10013/epic.28316.d001

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The relationship between whole-core compressional wave velocities and gamma-ray attenuation porosities of sediments cored at CRP-1 is examined and compared with results from core-plug samples and global models. Both core-plug and whole-core velocities show a strong dependence on porosity: this relationship appears to be independent of lithology. In the range from 0.1 to 0.4 of fractional porosity (Miocene strata), plug velocities are generally 0.2 - 0.5 km s-1 higher than whole-core velocities. Possible reasons include decreased rigidity in the whole core and diagenetic changes in the plugs. Possibly both velocity measurements are correct but neither is fully representative for in situ conditions. It appears that the core-plug results are more compatible with data from other regions than the whole-core data. After removing first-order compaction control from the whole-core porosity record, a second-order control by clay content can be quantified as a simple positive linear regression (R=0.6). In contrast, after correction for first-order control, porosity and velocity are not significantly influenced by lonestone abundance except for rare, very large lonestones.
Related to:
Niessen, Frank; Jarrard, Richard D; Bücker, Christian J (1998): Log-based physical properties of the CRP-1 Core, Ross Sea, Antarctica. Terra Antartica, 5(3), 299-310, hdl:10013/epic.28317.d001
Latitude: -77.007580 * Longitude: 163.755080
Date/Time Start: 1997-10-17T01:30:00 * Date/Time End: 1997-10-24T02:00:00
Minimum DEPTH, sediment/rock: 15.65 m * Maximum DEPTH, sediment/rock: 147.66 m
CRP-1 (16 km ENE Cape Roberts) * Latitude: -77.007580 * Longitude: 163.755080 * Date/Time Start: 1997-10-17T01:30:00 * Date/Time End: 1997-10-24T02:00:00 * Elevation: -153.5 m * Penetration: 132.06 m * Recovery: 113.32 m * Location: off Cape Roberts, Ross Sea, Antarctica * Campaign: CRP-1 * Basis: Sampling/drilling ice * Method/Device: Core wireline system (CWS) * Comment: sea ice thickness: 1.60 m, recovery 86 %. Age and lithology of oldest strata: 22-24 Ma; mudstone with scattered pebbles.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepth sedmGeocode
2SusceptibilitySusceptsensor valuesNiessen, FrankMulti-Sensor Core Logger 17, GEOTEKLoop sensortype: MS-2B (Bartington Ltd.). Loop sensor diameter: 8 cm. Alternating field frequency: 0.565 kHz. Magnetic field intensity: approx. 80 A/m RMS. Loop sensor correction coefficient K-rel: 1.45
3Magnetic susceptibility, volumekappa10-6 SINiessen, FrankCalculated
4Velocity, compressional waveVpm/sNiessen, FrankMulti-Sensor Core Logger 17, GEOTEKTransducer diameter: 5 cm (7.5 cm including transducer caps). Transmitter pulse frequency 500 kHz. Transmitted pulse repetition rate: 1 kHz. Received pulse resolution: 50 ns. P-wave travel-time offset: 21.85 µs
5Density, wet bulkWBDg/cm3Niessen, FrankMulti-Sensor Core Logger 17, GEOTEKGamma ray source: Cs-137. Source activity: 356 MBq. Source enetgy: 0.662 MeV. Collimator diameter: 5 mm. Gamma detector: Scintillation Counter (John Count Scientific Ltd.)
6PorosityPoros% volNiessen, FrankCalculated
22777 data points

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