The Index Properties data file contains information generated onboard the JOIDES Resolution by the shipboard physical properties scientists and technicians. Each sample is placed in a numbered beaker and is weighed on a balance, and the volume of the sample and beaker is measured in a pycnometer.
The sample is then dried and the weight and volume are remeasured. The index properties are calculated from these values. The balances used to weigh the samples have a precision of approximately +/- 0.02 to 0.03 gram, and the pycnometers are precise to approximately +/- 0.05 cubic centimeter. This yields a precision of approximately +/- 1% on unconsolidated sediments and about +/- 2% on consolidated sedimentsand hard rocks.
The Index Properties data file contains calculated values for the Index Properties tests. The calculated values included in this data file are wet and dry bulk density, porosity, and grain density as well as intermediate calculation values, and formulas.
Boyce, R.E., 1976. Definitions and laboratory techniques of compressional sound velocity parameters and water-wet content, wet-bulk density, and porosity parameters by gravimetric and gamma ray attenuation techniques. In: Schlanger, S.O., et al., 1976, Initial Reports of the Deep Sea Drilling Project, vol. 33: Washington (U.S. Goverment Printing Office) pp. 931-958.
LEG - Number identifying the cruise. The Ocean Drilling Program started numbering the cruises of the JOIDES Resolution at Leg 101.
SITE - Number identifying the site. A site is the position of a beacon around which holes are drilled.
HOLE - Letter identifying the hole.
CORE - Number identifying the core. Cores are numbered serially from the top of the hole downward.
CORETYPE - A letter code identifying the drill bit/coring method used to retrieve the core. Coretype codes are:
B - Drill Bit
C - Center Bit
D - Positive Displacement
H - Hydraulic (Advanced) Piston Core
I - Interstitial water (only used on Legs 101 to 116)
M - Miscellaneous
N - Downhole Mud Motor (Navidrill)
P - Pressure Core Barrel
R - Rotary
S - Side Wall Core
W - Wash Core
X - Extended Core Barrel
SECTION - A core is cut into 1.5-meter-long sections that are numbered serially from the top of the core. A core with full recovery will have 7 sections and a core catcher and be approximately 9.8 meters long.
TOP_INTERVAL - The location in centimeters within a section of the top of the interval tested.
BOTTOM_INTERVAL - The location in centimeters within a section at the bottom of the interval tested.
SUB_BOTTOM_DEPTH - Depth in meters down the hole from which the sample was taken.
BULK_DENSITY - The bulk density of the sample as calculated by the dry pycnometer volume method in grams/cubic centimeter.
DRY_DENSITY - The dry density of the sample as calculated by the dry pycnometer volume method in grams/cubic centimeter.
GRAIN_DENSITY - The grain density of the sample as calculated by the dry pycnometer volume method in grams/cubic centimeter.
POROSITY - The porosity of the sample as calculated by the dry pycnometer volume method as a percentage.