INDEX PROPERTIES DATA

INTRODUCTION

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

sediments and 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. To obtain raw data, intermediate calculation

values, and formulas, please contact the ODP Database Group.

BIBLIOGRAPHY

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.

DATA ITEM FORMATS

The Index Property data is presented in the following format:

LEG

SITE

HOLE

CORE

CORETYPE

SECTION

TOP INTERVAL

SUB-BOTTOM DEPTH

B BULK DENSITY

C BULK DENSITY

B DRY DENSITY

C DRY DENSITY

B GRAIN DENSITY

C GRAIN DENSITY

B POROSITY

C POROSITY

EXPLANATION OF THE INDEX PROPERTIES DATA ITEMS

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.

B_BULK_DENSITY - The bulk density of the sample as calculated

by the bulk pycnometer volume method in grams/cubic

centimeter.

C_BULK_DENSITY - The bulk density of the sample as calculated

by the dry pycnometer volume method in grams/cubic

centimeter.

B_DRY_DENSITY - The dry density of the sample as calculated

by the bulk pycnometer volume method in grams/cubic

centimeter.

C_DRY_DENSITY - The dry density of the sample as calculated

by the dry pycnometer volume method in grams/cubic

centimeter.

B_GRAIN_DENSITY - The grain density of the sample as

calculated by the bulk pycnometer volume method in

grams/cubic centimeter.

C_GRAIN_DENSITY - The grain density of the sample as

calculated by the dry pycnometer volume method in grams/cubic

centimeter.

B_POROSITY - The porosity of the sample as calculated by the

bulk pycnometer volume method as a percentage.

C_POROSITY - The porosity of the sample as calculated by the

dry pycnometer volume method as a percentage.