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A gamma-ray density gage showed that under simulated marine conditions standard Ottawa sand decreased in bulk density as indicated by the closely related linear attenuation coefficient on release of 10.3-MPa (1500-psi) confining pressure. This simulated recovery of a marine core from a depth of 1050 m. Expansion of the sand samples in one holder continued an average of 17 h. Samples repressurized within 4 h regained their original density while those left unpressurized for over 5 h did not. Density variation in marine cores following retrieval is significant and results primarily from effervescence and expansion of gas bubbles.
cores, marine geology, pressures, densitometer, gamma ray
Supervising ocean engineer, Brown and Caldwell, Consulting Engineers, Walnut Creek, CA