HR: 17:15h
AN: OS34A-05    [Abstracts]
TI: Core-log Integration as a Tool for Improving Depth Resolution
AU: * Gilbert, L A
EM: lgilbert@williams.edu
AF: Williams College, Williams-Mystic 75 Greenmanville Ave, Mystic, CT 06355, United States
AU: Burke, A
EM: aburke@mit.edu
AF: MIT/WHOI Joint Program, 77 Massachusetts Ave, Cambridge, MA 02139, United States
AB: Geophysical, geochemical, petrologic, and structural geology data collected from both recovered cores and logged in holes drilled into the seafloor have been used to make many significant advances in our understanding of both the ocean crust and overlying sediments. However, in seafloor drilling operations, especially those in crustal rocks, the recovery of cores is generally incomplete and depths of recovered core pieces are assigned with some uncertainty. Assigning some arbitrary piece depth within a core, such as the shallowest possible depths for recovered core pieces, is a quick but less than optimal method of determining in situ depth.

We have integrated physical property data from the recovered core and logged in the open hole to determine a new depth record for core pieces at IODP Hole 1256D, which is our first opportunity to study a section of intact, in situ upper ocean crust drilled down to gabbro. The re-interpreted piece depths will be important to high-resolution studies incorporating both core sample and logging data at this site. Our method will be of general use to IODP researchers wishing to better resolve core piece depths, and to others engaged studies that rely on oceanic and continental drilling. Our method is also rapid, requires little subjective input, and is applicable to any core-log integration problem where sufficient data have been collected in both the open hole and from the recovered core.
DE: 3036 Ocean drilling
DE: 5100 PHYSICAL PROPERTIES OF ROCKS
DE: 7220 Oceanic crust
SC: Ocean Sciences [OS]
MN: 2007 Fall Meeting