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doi:10.2204/iodp.sp.302.2004
SAMPLING AND MEASUREMENT STRATEGY
This Sampling and Measurements Plan for ACEX (Appendix 1) was prepared to meet the scientific objectives of IODP Proposal 533-Full3 following the recommendations of the Science Advisory Structure. This plan is the first for MSPs in scientific ocean drilling and incorporates some new approaches required due to the nature of MSPs where the science will be conducted offshore and onshore.
During the offshore component, three science activities will be conducted: (1) ephemeral properties (pore-water chemistry, microbiology, physical properties; gas analyses for safety purposes) will be measured and/or selected samples preserved; (2) core logging, supplemented with downhole logs for near real-time stratigraphic correlation; and (3) near real-time micropaleontology (and palynology) for biostratigraphic analyses. Cores will be sealed and stored in temperature-controlled containers for processing onshore. A subset of the full scientific party will participate during the offshore phase to complete this work.
The offshore science component is further divided into two parts: work conducted on Vidar Viking and on Oden. The primary scientific function on Vidar Viking is stratigraphic correlation to ensure that a complete sediment record is recovered at the prime sites. Also, measurements in support of drilling safety will be conducted. All core catcher material will be sampled on Vidar Viking and transferred to Oden primarily for micropaleontology (and palynology) and secondarily for sedimentology. After core intervals are confirmed to be duplicates (during stratigraphic correlation) from paired holes and on a selected basis, whole round intervals (5-10 cm lengths) will be sampled on the Vidar Viking for physical properties, pore-water chemistry and microbiology. Pore-water analyses will be conducted on both ships and microbiology sample preservation and analyses, physical property measurements, and organic chemistry analyses (for safety) will be conducted on Oden.
During the onshore component, the remaining scientific measurements and observations will be completed on the sealed cores requiring the entire scientific party (Appendix 1).