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The Pliocene-Quaternary deposits recovered by deep-sea drilling in the Black Sea make up a continuous section with a clearcut transition from unconsolidated sediment to rock. Distinction between them has never been clearly defined and can be expected only from studies on a great number of sections formed in various parts of the world oceans. Above all, they should be deposits resulting from continuous accumulation, free of any discontinuities; the PlioceneQuaternary deposits of the Black Sea meet this requirement almost ideally. Sediment is transformed into rock as a result of internal diagenesis under the influences of biochemical and geochemical processes, pressure, and temperature; original properties such as strength, consistency, volume weight, etc., become transformed. Study of such features, "the physical and mechanical properties," can yield much qualitative and quantitative information as to the direction and intensity of the post-depositional changes in each interval of the sedimentary series. This was the chief aim of the present research. Our investigation of physical and chemical properties was conducted on material placed at our disposal by Leg 42B Scientist Co-Chief, V. P. Neprochnov (Table 1). Ten monolith samples, expressly taken at Site 381, by onboard research group member, E. S. Trimonis, were 10-cm core pieces uncut along the longitudinal axis, and treated with paraffin to preserve humidity and natural texture. In addition, 50 wet samples, with a disturbed texture, recovered from various depths of Holes 38O/38OA, were studied. Several of these samples, recovered from greater depths (approximately 200-300 m), were nearly intact, enabling a wider set of physical and mechanical properties to be investigated.

Physical and Mechanical Properties of the Black Sea's PlioceneQuaternary Sediments (Sites 380 and 381)

Physical and Mechanical Properties of the Black Sea's PlioceneQuaternary Sediments (Sites 380 and 381)