Background

• Main Authors: Frank R. Rack, Rustan Finndin, Kate Moran
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Bedford; Lier; Yermak Plateau; Yermak plateau
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.508.5488; http://www-odp.tamu.edu/publications/151_SR/VOLUME/CHAPTERS/sr151_21.pdf

Ocean Drilling Program Hole 910D was drilled on the crest of the southern Yermak Plateau at 80°15.881'N, 6°65.424'E, in 567.7 m water depth. This hole consists of three cores recovered with the advanced hydraulic piston corer (APC) and 15 cores recovered with the extended core barrel (XCB), penetrating to a total depth of 160.6 meters below sea floor (mbsf). Three ear-lier holes were drilled at this site, but two of them (Holes 910A and 910B) failed to penetrate through a stiff horizon at about 20-24 mbsf, and a third hole (Hole 9IOC), drilled using the rotary core barrel (RCB), yielded poor core recovery in the upper 200 mbsf. As a first step in the study of individual core sections from Hole 910D, non-destructive, whole-core X-ray examinations were performed at the Atlantic Geoscience Center of the Bedford Institute of Oceanography in Dartmouth, Nova Scotia, Can-ada. Using a high-resolution video monitor, X-ray images of almost 96 m of core were visually examined and described; these X-ray images were simultaneously recorded on video tape for further digital processing and interpretation. Videotaped X-ray images of the Hole 910D core sections have been used to identify the relative position and size of indi-vidual clasts (>2 mm in diameter) and coarse sand layers, and to identify extensively bioturbated intervals, represented by bur-row traces in these cores. Solid particles>2 mm in diameter, were counted for successive 10-cm intervals of core using the video X-ray images. The X-ray images provide "ground truth " for making comparisons with other nondestructive measure-ments made on these cores using sensors mounted on the multisensor track (MST), and for identifying changes in depositional environments at this site.