Rea, Brice R. and Gaillot, Philippe (2006): Correction of core physical properties and composite depths for Sites 1215-1222 using core-log correlation-derived rebound coefficients

ODP 199
ODP 199 1215
ODP 199 1216
ODP 199 1217
ODP 199 1218
ODP 199 1219
ODP 199 1220
ODP 199 1221
ODP 199 1222


Rea, Brice R.
University of Leicester, Department of Geology, Leicester, United Kingdom

Gaillot, Philippe
Boise State University, United States

Correction of core physical properties and composite depths for Sites 1215-1222 using core-log correlation-derived rebound coefficients
In: Wilson, Paul A., Lyle, Mitchell W., Janecek, Thomas R., Backman, Jan, Busch, William H., Coxall, Helen K., Faul, Kristina, Gaillot, Philippe, Hovan, Steven A., Knoop, Peter, Kruse, Silke, Lanci, Luca, Lear, Caroline, Moore, Theodore C., Nigrini, Catherine A., Nishi, Hiroshi, Nomura, Ritsuo, Norris, Richard D., Palike, Heiko, Pares, Josep M., Quintin, Lacie, Raffi, Isabella, Rea, Brice R., Steiger, Torsten H., Tripati, Aradhna, Vanden Berg, Michael D., Wade, Bridget, Proceedings of the Ocean Drilling Program; scientific results; Paleogene equatorial transect; covering Leg 199 of the cruises of the drilling vessel JOIDES Resolution; Honolulu, Hawaii, to Honolulu, Hawaii; Sites 1215-1222; 23 October-16 December 2001
Texas A&M University, Ocean Drilling Program, College Station, TX, United States
A methodology was developed that can be used to derive rebound coefficients for the correction of rebounded core physical properties (density, porosity, and void ratio) and spliced meters composite depths (mcds) to in situ values. The increasing-with-depth mismatch between logging depths (density curves were used in this instance) and mcd depths are treated as consolidation tests, only somewhat larger. Core physical properties and mcd depths are first corrected for hydraulic rebound (here almost 4 m of offset at 190 meters below seafloor [mbsf]); the remaining offset is attributed to mechanical (porosity) rebound. The offset between the hydraulic rebound-corrected depths and logging depths are used in conjunction with hydraulic rebound-corrected discrete core sample physical properties to obtain rebound coefficients (Cr values) for the nannofossil and radiolarian oozes at Ocean Drilling Program (ODP) Sites 1218 and 1219. Using the nannofossil ooze rebound coefficients, the Site 1218 mcds are corrected upcore from a tie point at 80 mbsf, allowing derivation of a linear compression for the overlying pelagic clay unit. The three relationships derived from these two sites can then be used to correct the core physical properties and mcds for the other sites cored during ODP Leg 199. The corrected Site 1219 spliced density curve is presented as an example of this process. This method can also be applied to other ODP and Deep Sea Drilling Project sites where unlithified pelagic sediments were cored, a stratigraphic splice can be/has been constructed, and downhole logging was undertaken. Using this approach, it may be possible to produce locally to regionally applicable rebound-correction relationships for a number of pelagic sediments.
Coverage:Geographic coordinates:
West:-148.0000East: -135.0000

Oceanography; consolidation; cores; correlation; depth; downhole methods; Equatorial Pacific; Leg 199; marine sediments; mechanical properties; Ocean Drilling Program; ocean floors; ODP Site 1215; ODP Site 1216; ODP Site 1217; ODP Site 1218; ODP Site 1219; ODP Site 1220; ODP Site 1221; ODP Site 1222; Pacific Ocean; physical properties; porosity; sediments;