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  • 129-801B; 129-801C; Density, wet bulk; Depth, relative; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg129; North Pacific Ocean; Ocean Drilling Program; ODP; Porosity; Sample code/label; Velocity, compressional wave  (1)
  • elastic constants
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  • 1
    Electronic Resource
    Electronic Resource
    Elastic constants and velocity surfaces of indurated anisotropic shales (1994)
    Springer
    Surveys in geophysics 15 (1994), S. 481-494 
    Details
    ISSN: 1573-0956
    Keywords: Vp ; vs ; laboratory ; anisotropy ; shales ; elastic constants ; velocity surfaces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The velocities of two Devonian-Mississippian shales have been measured to confining pressures of 200 MPa in a laboratory study of anisotropy and wave propagation. Both samples were found to be transversely isotropic at elevated pressures with the main symmetry axis perpendicular to bedding. The elastic constants of the shales were used to calculate phase and group velocity surfaces as a function of angle to the bedding normal. Multiple velocity measurements in non-symmetry directions, not undertaken in previously published studies of shales, have been used to confirm features observed on calculated velocity surfaces. It is demonstrated that velocities measured in non-symmetry directions are phase velocities. Group velocities were found to be significantly lower than the corresponding phase velocities of the shales due to their high anisotropies. Shear wave splitting was found to be negligible for propagation directions within approximately 30° of the bedding normals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690171
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    Paper (German National Licenses)
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  • 2
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    (Table 1) Physical properties of ODP Site 129-801 (1992)
    PANGAEA
    In:  Supplement to: Wallick, Brian P; Christensen, Nikolas I; Ballotti, Dean M (1992): High-pressure velocity measurements of Jurassic Basalt, Leg 129. In: Larson, RL; Lancelot, Y; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 129, 501-506, https://doi.org/10.2973/odp.proc.sr.129.140.1992
    Details
    Publication Date: 2024-01-09
    Description: Compressional wave velocities and densities were measured for 6 basalt samples from ODP Hole 801B and 16 samples from ODP Hole 801C, a site that represents the first drilling of Jurassic-age crustal rocks in the Pacific basin. Incremental measurements, taken to a total pressure of 200 MPa, show a systematic decrease in velocity with increasing porosity and a related increase with increasing wet-bulk density. A comparison of the plot of porosity vs. compressional wave velocity with the theoretical equation from Wyllie et al. (1958) suggests this equation is inappropriate for oceanic basalts because of mineral alteration in high porosity samples. Also of interest is the dramatic change in velocity across a hydrothermal boundary. Basalts below this hydrothermal layer have a mean velocity of 6.05 km/s at 60 MPa while those above show a mean velocity of 4.55 km/s at 60 MPa. The low velocity values of the basalts above the hydrothermal deposit may be attributed to the higher porosity and composition observed in these rocks; the higher porosity is possibly the result of increased exposure to circulating seawater.
    Keywords: 129-801B; 129-801C; Density, wet bulk; Depth, relative; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg129; North Pacific Ocean; Ocean Drilling Program; ODP; Porosity; Sample code/label; Velocity, compressional wave
    Type: Dataset
    Format: text/tab-separated-values, 242 data points
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    DATA PANGAEA
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