Abstract: Shipboard Geotechnical Results from U.S. Geological Survey's Atlantic Margin Coring Project

Adrian F. Richards

The Glomar Conception was chartered by the U.S. Geological Survey from July to September 1976 to make continuous cores in the Atlantic continental margin; 20 holes were drilled to a maximum depth of 300 m below the seafloor. Bulk density of about 680 unopened core sections, each up to 1.5 m long, were obtained immediately after collection using the Lehigh Model III laboratory nuclear-transmission densitometer. Motorized, laboratory, miniature-vane shear-strength measurements were made on one-half of 60 core sections after they had been sawed axially in half. About 900 hand-held Torvane shear-strength measurements were made in the ends of uncut core sections and on the surface of the cut sections. Shipboard density measurements on cores from each hole will be related to li hology and depth below the seafloor and compared to in-situ density measurements logged with a compensated-density tool. Shear-strength measurements also will be related to lithology and depth in the 20 holes that were drilled and cored.

AAPG Search and Discovery Article #90968©1977 AAPG-SEPM Annual Convention and Exhibition, Washington, DC