OCEAN DRILLING PROGRAM revised DATA FILE DOCUMENTATION July 1990 PALEOMAGNETICS MEASUREMENTS SUSCEPTIBILITY I. INTRODUCTION The Susceptibility data file contains the susceptibility measurements taken onboard the JOIDES/Resolution. A Bartington M.S.1 Magnetic Susceptibility meter on the ship can measure discrete samples or whole core sections passed through the instrument's sensor loop. The data are collected directly from the susceptibility meter onto the shipboard VAX computer and brought back to shore on magnetic tape. (Up through Leg 107 discrete sample results were collected on paper forms and encoded on shore.) The data file contains measurements made on discrete samples and continuous whole core sections. If you have problems or questions concerning these data, please contact: Data Librarian, Data Base Group Ocean Drilling Program Texas A&M University Research Park 1000 Discovery Drive College Station, Texas 77845-9547 U.S.A. (979) 845-8495, 845-2673 Easylink (Telex) Number: 62760290 Email: database@odpemail.tamu.edu Fax Number: 979-845-4857 II. LEGS IN THE DATA FILE The data file contains data from Legs 104-107, 111, 114-129. III. BIBLIOGRAPHY Shipboard Scientific Party, 1987. Explanatory Notes. in Srivastava, S. P., Arthur, M. A., Clement, B. M., et al., Proc., Init. Repts. (Pt A), ODP, 105. IV. DATA ITEM FORMATS The following table lists the data items and their formats. For data requests other than on paper (ie. on magnetic tape), an accompanying sheet will contain any more information needed to read the data. SUSCEPTIBILITY DATA ITEMS FORMAT ========================= ======== SAMPLE_CODE TEXT 4 LEG INTEGER 3 SUBLEG TEXT 1 SITE INTEGER 4 HOLE TEXT 1 CORE INTEGER 3 CORETYPE TEXT 1 SECTION TEXT 2 TOP_INTERVAL INTEGER 3 BOTTOM_INTERVAL INTEGER 3 PIECE INTEGER 3 SUB_PIECE TEXT 1 VOLUME DECIMAL F5.1 SUSCEPTIBILITY DECIMAL F9.2 WC_OR_DS TEXT 2 V. EXPLANATION OF THE SUSCEPTIBILITY DATA ITEMS SAMPLE_CODE - An alpha code identifying the investigator or test for which the sample was taken. LEG - Number identifying the cruise. The Ocean Drilling Program started numbering the cruises of the JOIDES Resolution at Leg 101. SUBLEG - Letter identifying a subleg or transit. A subleg is the continuation of a Leg in the same area with the same objectives after a port call and crew change. 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. The coretype codes are: B - Drill Bit C - Center Bit D - Positive Displacement H - Hydraulic Piston Core 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 of the top of a sample within a section in centimeters. BOTTOM_INTERVAL - The location of the bottom of a sample within a section in centimeters. PIECE - Number identifying a rock piece within a section. A piece is one or a group of rock fragments that can be fitted together. SUB_PIECE - Letter identifying the individual rock fragments within a piece. VOLUME - The volume of the sample in cubic centimeters. SUSCEPTIBILITY - The value is in x10-6 cgs units and is volume corrected. WC_OR_DS - Indicates whether the reading was done on a discrete sample (DS) or a whole core (WC). RECORD FORMAT ON TAPE FOR THE PALEOMAGNETICS MEASUREMENTS - SUSCEPTIBILITY DATA FILE COLUMN DATA ITEM ON FILE ========= ======= SAMPLE_CODE 2-5 LEG 6-8 SUBLEG 9-9 SITE 10-13 HOLE 14-14 CORE 15-17 CORETYPE 18-18 SECTION 19-20 TOP_INTERVAL 21-23 BOTTOM_INTERVAL 24-26 PIECE 27-29 SUB_PIECE 30-30 VOLUME 31-35 SUSCEPTIBILITY 36-44 WC_OR_DS 45-46