Previous   |   Next

doi:10.2204/iodp.sp.313.2009

Appendix

New Jersey Shallow Shelf ESO sampling and measurement plan

This plan was presented at the January 2006 Integrated Ocean Drilling Program (IODP) Science Technology Panel meeting in Kochi and was approved by the panel. The plan is subject to amendment according to the scientific needs and interests of the expedition scientists or operational constraints. The most pressing operational constraint during the offshore phase is likely to be space, both for analysis and for accommodation. The priority given to the respective offshore measurements are as follows:

1. Curation,

2. Downhole logging,

3. Multisensor core logging (MSCL),

4. Inorganic geochemistry,

5. Microbiology,

6. Sedimentology, and

7. In situ borehole temperature measurements.
   

Offshore sampling and analysis

Please see www.marum.de/en/
Offshore_core_curation_and_measurements.html in addition to the text below.

Core curation

There will be a mobile core curation laboratory container on board the drilling platform, supervised by the Chief Curator. Curatorial personnel will also cover the opposite shift. The curators will have delegated responsibility in the absence of the European Consortium for Ocean Research Drilling (ECORD) Science Operator (ESO) Curation Manager and IODP Curator Dr. Ursula Röhl. A sufficient number of core storage containers will be on the drilling platform. There will be no splitting of the cores at sea, as it will be more efficient to carry out most of the following scientific analysis during the Onshore Science Party in Bremen.

Offshore core flow

For details of the offshore core flow, see Figure AF1.

Lithologic description

Core catcher samples will be collected, split, and labeled and the working half handed over to the scientists in charge of sedimentologic description. If no core catcher is collected, a sample from the lower end of the section will be taken for analysis.

Inorganic geochemistry

Pore water samples (e.g., squeezers and rhizone moisture samplers) (Seefeld et al., 2005) will be taken on a routine basis (every three cores if recovery is good). Pore water should be extracted immediately from a core sample, and ephemeral properties (e.g., salinity, pH, alkalinity, and ammonia) will be analyzed immediately. Sample splits for onshore analysis (e.g., cations, sulfide, and ¹³C) will be prepared and preserved offshore. Depending on the parameter, the interstitial water sample might be specially treated in order to conserve it for later analyses.

Microbiology

The precise sampling strategy is defined by the requests of the science party microbiologists, as IODP microbiology policies in relation to routine sampling for microbiology are currently under discussion. Samples will be taken immediately in the field under the most sterile possible conditions. Results will be interpreted with care as contamination may occur during drilling and any microbial material found may not be in situ. Fluorescent microspheres will be added to the drilling mud to assist evaluation of contamination of samples for microbiology studies. Proper sample archiving (deep freezing) will be conducted.

Offshore petrophysics measurements

Downhole logging

The following is a generic list of minimum and additional logging tools that are intended to be run at each of the three proposed sites. The tools are listed by the formation properties which they measure, and not by "operator"-based trademark names.

High-priority suite:

• Total through-pipe gamma ray.

• Induction resistivity.

• Sonic measurements.

• Magnetic susceptibility.

• Open-hole spectral and total gamma ray.

• Mechanical caliper.

• Vertical Seismic Profile (VSP) logging.

• In situ borehole temperature.

Lower-priority suite:

• Hydrogeological properties.

• Acoustic imaging (including acoustic caliper).

Core logging

Cores will be logged on the drilling platform in a modified 20 ft container, housing a single MSCL track comprising one magnetic susceptibility loop, density, velocity, and resistivity sensors measuring gamma ray attenuation, magnetic susceptibility, electrical resistivity, and P-wave velocity. The single core-logger system will include a spares kit.

Onshore sampling and analysis

Onshore core flow

For details of the offshore core flow, see Figure AF2.

Location

The Onshore Science Party will be undertaken at the IODP Bremen Core Repository and Laboratory at the University of Bremen, with access to the laboratories at the MARUM-Center for Marine Environmental Sciences and the Department of Geosciences.

Planned analysis and available facilities

The following facilities will be available for the Expedition Scientists at the Bremen IODP Core Repository (www.marum.de/en/
Onshore_Science_Party_OSP.html). Note that it is not considered prudent to transport all these facilities to the drilling platform:

• Core splitting: an archive half will be set aside as per IODP policy.

• Core description: ESO will provide a system that is IODP standard. For data entry, ESO will employ an Offshore Drilling Information System (DIS) system that is entirely compatible with others being used in IODP.

• Core photography: core shots (table layout) on a routine basis, close-ups on request.

• Core sampling: for Onshore Science Party samples (paleomagnetism, physical properties, X-ray diffraction (XRD), inorganic geochemistry, and carbonate [TC]/total organic carbon [TOC]).

• Smear slide preparation: as requested, preparation, description, and interpretation.

• Micropaleontology: microscope laboratory (access to laboratory for routine sample preparation, including a hood if acid needs to be applied).

• Inorganic geochemistry: whole-rock and pore fluid chemistry, inductively coupled plasma–optical emission spectrometry (ICP-OES; Perkin-Elmer Optima3000), energy dispersion polarization X-ray fluorescence (EDP-XRF; Spectro-Xepos), and TC/TOC (Leco).

• Bulk mineralogy and X-ray diffraction (XRD) analysis (Philips XpertPro).

• Petrophysical measurements:

  • Selected repeat whole-core measurements for quality assurance/quality control (QA/QC) if required.

  • Natural gamma ray logging on whole cores.

  • Thermal conductivity measurements.

  • Split-core MSCL: P-wave, gamma ray attenuation [GRA] density, and magnetic susceptibility (if required).

  • Physical properties of discrete samples (moisture/sample density): determination of index properties (wet bulk density, grain density, porosity, void ratio). Following IODP procedure, core samples will be oven-dried, the dried sample volume quantified using a Quantachrome penta-pycnometer, and masses using a high-precision balance.

  • Velocity measurements.

  • Color reflectance measurements (Minolta spectrophotometer).

  • Digital imaging (line-scan camera on MSCL track).

  • X-Ray computed tomography (CT) scanning before Onshore Science Party (a limited number of two- and three-dimensional whole-core scans using a General Electric Prospeed SX can be done at MARUM upon request and on selected core sections only).

• Paleomagnetic measurements:

  • Natural remnant magnetism (NRM) with stepwise demagnetization (2G longcore cryogenic magnetometer) on U-channels (pass through) or samples (robot system which feeds up to 100 adapted sample cubes)

• Core sampling: a detailed sampling plan will be devised at the completion of the offshore phase and after the scientists have submitted their revised sample requests.

• Corewall viewing and integration: a system will be available for the viewing/comparison of line-scan core images and log data.

• Seismic workstation: viewing software (to be decided) to overlay wireline log and VSP measurements onto seismic images at each drill site.

Top of page   |   Previous   |   Next