Several important paleomagnetic databases are maintained by ODP, including data produced by Legs 1-96 of the Deep Sea Drilling Project, and data from ODP Legs 101 and 103 to the present leg. All of the DSDP data are available for use aboard JOIDES Resolution; the Computer Systems Manager can provide more detailed information. Explanations of the methods used to collect and process data in the database are provided in the Explanatory Notes" chapter of the Initial Reports published for each leg. Discussions of site-specific data and results are presented in the Site Chapters of the Initial Reports.
Data may be requested from ODP through the Data Librarian:
Data Librarian
Ocean Drilling Program
Texas A&M University Research Park
1000 Discovery Drive
College Station, Texas 77845-9547, U.S.A.
1-409-845-8495, 845-2673
Fax Number: 1-409-845-4857
Small requests can be answered quickly and free of charge; if a charge is made to recover expenses, an invoice will be sent and must be paid before the request is processed.
Also available from ODP are Data Announcements (updates on data availability), Data File Documents (information of specific ODP data files), and ODP Technical Note 9, "Deep Sea Drilling Project Data File Documents.
The paleomagnetics declination-inclination-intensity (DII) data file contains magnetization measurements taken on board the JOIDES Resolution. Declination, inclination, and intensity data recorded in this file include measurements of NRM and demagnetized remanence of continuous archive-half sections of the core made with the cryogenic magnetometer, and NRM and demagnetized remanence from discrete hard-rock and sediment samples measured on either the cryogenic or the Molspin Minispin magnetometer.
The declination, inclination, and intensity data are collected directly from the magnetometers onto the hard drives of shipboard personal computers and floppy disks. The data are then uploaded onto the shipboard VAX computer and brought back to shore on WORM discs (discrete sample results from Legs 101 to 107 were collected on paper forms and encoded on shore). Rock magnetic data collected on the ship are stored on floppy disks delivered to ODP for storage by the data librarian.
The following table lists the data items and their formats. For data requests other than on paper (e.g., on magnetic tape), an accompanying sheet will be sent that will contain any additional information needed to read the data.
PALEOMAGNETIC 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 A_OR_W TEXT 1 WC_OR_DS TEXT 2 METHOD TEXT 1 TREATMENT.TYPE TEXT 2 TREATMENT.LEVEL DECIMAL F6.1 DECLINATION DECIMAL F6.2 INCLINATION DECIMAL F6.2 INTENSITY DECIMAL F10.4 CSD DECIMAL F5.2
SAMPLE_CODE -An alphabetical code identifying the investigator or study 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 (APC) M - Miscellaneous N - Motor-Driven Core Barrel (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 sedimentary 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 measured in centimeters from the top of the section.
BOTTOM_INTERVAL -The location of the bottom of a sample measured in centimeters from the top of the section.
PIECE -Number identifying a rock piece within a section. A piece is a single rock fragment, or a group of 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. For whole-core cryogenic measurements, volume is left blank. When whole cores are fed through the cryogenic, it takes readings at predetermined intervals along the core. Since these readings are at "points," there is no volume.
A_OR_W -Indicates whether the sample or reading was taken from the archive (A) or working (W) half of the core.
WC_OR_DS -Indicates whether the reading was done on a discrete sample (DS) or the whole core (WC).
METHOD -Instrument used to obtain the reading
S = Molspin Spinner Magnetometer C = Cryogenic Magnetometer
TREATMENT.TYPE -
AF = Alternating-Field Demagnetization
TH = Thermal Demagnetization
NR = Natural Remanent (undemagnetized) Magnetization
TREATMENT.LEVEL - The treatment level used for the measurement.
AF is in mT TH is in degrees C NRM is always 0
DECLINATION - Recorded in degrees from 0.00 to 359.99.
INCLINATION - Recorded in degrees from -90.00 to 90.00.
INTENSITY - Reported in mA/m.
CSD - Circular Standard Deviation (Fisher, 1953) of three vectors measured during six spin measurements. The value is inversely related to the internal consistency of the measurement. A value above 30 represents a random measurement. No CSD values are calculated for measurements made using the cryogenic magnetometer.
When using DII data from Legs 101 through 147, the following points should be considered:
1. XYZ data were not routinely retained, but may be available for some legs.
2. CRYO data are grouped into files by CLEANING LEVEL and CORE.
3. SPINNER data are grouped by core only (i.e., all cleaning levels for each sample from the same core are contained within the same file).
4. Data from piston cores may have been oriented (declination adjusted) using data from the multishot tool. However, the amount of adjustment and original declination data may not be available.
The susceptibility data file contains the susceptibility measurements taken on board 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. (Until Leg 107, data from discrete samples were collected on paper.) The data file contains measurements made on discrete samples and continuous whole-core sections.
The following table lists the susceptibility data items and their formats. For data requests other than on paper (e.g., on magnetic tape), an accompanying sheet will be sent that will contain any additional 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
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 objective 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 hold downward.
CORETYPE - A letter code identifying the drill bit/coring method used to retrieve the core. The following coretype codes are used:
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 measured in centimeters from the top of the section.
BOTTOM_INTERVAL -The location of the bottom of a sample measured in centimeters from the top of the section.
PIECE - Number identifying a rock piece within a section. A piece is a single rock fragment, or a group of 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 -Data may be collected in either SI or cgs units. Data from discrete samples can be corrected for volume.
WC_OR_DS -Indicates whether the reading was done on a discrete sample (DS) or a whole core (WC).