README File for Leg 138 Data Disk This document contains a brief description of the data structure and data files contained on the Leg 138 cd-rom. This cd-rom represents ODP's first effort to publish an extensive data set collected during one leg of the program. The cd- rom contains over 500 mbyts of data collected as part of Leg 138. In addition this disk contains the data files and programs used to generate the composite sections from multiple holes drilled at each site. On the cd-rom there is one master directory named LEG_138. Under this master directory are 14 subdirectories, one directory for each of the eleven sites drilled during leg 138 and three additional directory named 'PROGRAMS', 'COREDATA', and 'TABLES'. TABLES DIRECTORY: In the TABLES directory there are several chapter subdirectories containing data tables of Volume 138 preliminary reports. For example if you want to find the data contained in Table 21 of Chapter 12 (Site 847), the data would be found in the file named 'TABLE.12' in the subdirectory 'CHAPTER.12' in the directory 'TABLES'. COREDATA DIRECTORY: There are three types of data files in this directory: Data files with file names of the form 'CORE846B.DAT' contain the basic ODP data for each core recovered at Site 846 Hole B. Each line of the file contains the site, hole, core, core type and the subbottom depth of the core top. Included is the length of each section cut from the core and the length of the core catcher samples. Data files with file names such as '853.ADJ' contain the adjusted depths of all cores taken at Site 853. The file contains the original subbottom depth of the core top and bottom, the core length, and then the subbottom depth in composite meters of the core top and bottom (see individual site chapters). Data files with file names such as 'DEPTH853.FIN' gives similar information as the .adj files. These files give the subbottom depth of the first GRAPE analsyis each core first in ODP subbottom depth (in MBSF) and then in composite meters (MCD). These files are used by program ADJ_DEP to calculate the composite depth of a sample given its subbottom depth. PROGRAMS DIRECTORY: This directory contains five non-ODP computer programs (in Fortran-77) which were used extensively during Leg 138. These program were used on UNIX based workstations used during the leg. While these program are not intended to be used directly from the cd-rom, they provide the numerical procedures used to process data during the leg and the numerical strategy used to generate composite depth sections at each site. FIXGRAPE, was used to reduce the raw GRAPE data collected for each hole at a site. This program averaged duplicate samples at a given depth to improve signal quality as well as calculated a smoothed GRAPE record using a guassian smoothing function. SPLICE was used to generate composite depth sections of GRAPE, magnetic susceptibility and color reflectance. MBSFSPLI was used to convert composite depth meters back to meters below sea-floor. DEP_ADJ will calculate equivalent composite depths for any data file which has standard ODP sample identification for each data line. The program used data files found in the COREDATA directory. GRAPECOR corrects the GRAPE densities. The GRAPE calculated bulk density using a single attenuation coefficient. The program GRAPECOR corrects the GRAPE densities. The use of a single coefficient results in the density of water being defined as 1.128 g/cc. SITE DIRECTORIES: Each site drilled during Leg 138 has a separate data directory (e.g. site_849) which contains all the data specific to that site. In these directories are five subdirectories: GRAPE (GRAPE density data), SUS (magnetic susceptibility data), COLOR (color reflectance data), PP (physical properties data), and CHEM (chemistry data). If downhole measurements were made at the site these data are stored in a directory named LOGS. There are also a five additional data files: Data files with file names such as 'AGE.849' contain the low resolution age-depth information used to generate the sedimentation rates as described in each individual site chapter. Column 1 of this file is the depth (in MCD) and column 2 is the estimate age (Ma). Data files with file names such as 'MCD_AGE.849' contain the high resolution age depth information as described in Chapter 6. The first column in these data files is the depth (in MCD) and column 2 is the estimate age (Ma) of the GRAPE events identified in this specific site. Data files with file names such as 'MBSF_AGE.849' contain the high resolution age depth information as described in Chapter 6. In this file the first column is the depth of the identified GRAPE event in MBSF and column 2 is the estimated age. Data files with file names such as 'MBSF.849' contain the end- points of the line segments used to convert meters in composite depth units (MCD) back to meters below the sea-floor (MBSF). Column 1 of this data file is the depth in MCD units and the second column is the equivalent depth in MBSF units. This data file is used by the program MBSFSPLI. Data files with file names such as 'SPLICE.849' contain the information needed to construct the composite sections generated for each site. The first column of these data files are meters composite depth in which data from the hole indicated in column 2 should be used (in column 2 a 1 = Hole A, 2 = Hole B, 3 = Hole C etc.). Thus if lines 2 and 3 of this data file read: 3.5 3 10.9 2 then from 3.5 meters to 10.9 meters in the composite section the data from Hole C is used in the composite section. At 10.9 meters the data from Hole B will be used until the next entry in the data file indicates a change. These data files are used by the program SPLICE to construct the composite sections. SITE SUBDIRECTORIES: These directories contain the GRAPE density, magnetic susceptibility, physical properties, sediment chemistry, sediment color, and borehole measurements data collected during Leg 138. These data set represent the largest fraction of the data collected during the leg. With the exception of the borehole data files and interstitial water analysis these files are written with a standard ODP sample identification character string on each sample line. This identification string contains the following information: Characters 1 - 4: Leg number (in this case 138) 8 - 11: Site number 13: Hole (A, B, C, D, or E) 15-17: Core number 19: Core type (H = APC, X = XBC) 21 - 22: Section number (CC = core catcher) 24 - 28: Depth in section to top of sample 30 - 34: Depth in section to bottom of sample 36 - 42: Depth of sample below sea floor (mbsf) CHEM. This directory contains the interstitial water and the results of inorganic and organic carbon analysis completed at each site during Leg 138. Data files with the name INTERSTI.### [where ### is the site number] contains the results of interstitial water analysis. Measured variables include pH, salinity, chlorinity, Na, alkalinity, sulfate, Mg, Ca, K, Sr, Li, Silica and ammonia. Files named CARBON.### contain the results of the organic and inorganic carbon analysis. This file has a standard ODP sample header for each sample. After this identification string there are six fields of 7 characters. These fields include the following parameters: depth in the composite section (mcd), total carbon (if measured), total inorganic carbon, carbonate, organic carbon and nitrogen (all in percentages). If a parameter is not measured then the field is left blank. COLOR. This directory contains all the color reflectance data collected during Leg 138 (see Chapter 4). There are two types of data files in the upper part of this directory: Data files with names COLxxxx.FIN, where xxxx is Site and Hole (e.g. COL849B.FIN for Site 849 Hole B) contain final processed color data in which the original color reflectance percentages in 511 channels are block-averaged to three 50 nm bands. Each line contains the standard ODP sample identification string, including Leg, Site, Hole, Core, Coretype, Section,Depth in section (top of measured interval), Depth in Section (bottomof measured interval) followed by three columns of light reflectance (in percent) for the bands 450-500 ("blue"), 650-700 ("red"), 850-900 ("near infrared"), followed by two columns which contain the shipboard composite depth MCD, and the depth adjustment between MCD and MBSF. These files were used at sea for plotting barrel sheet summaries and composite sections. Data files with names COLxxxx.TEN, where xxxx is Site and Hole (e.g. COL849B.TEN for Site 849 Hole B) contain processed color data in which the original color reflectance percentages in 511 channels are block-averaged to ten 50 nanometer bands. Each line contains the standard ODP sample identification string as noted above, followed by one column denoting sensor-to-core distance offset from the optimum point (in arbitrary units), followed by 10 columns of color reflectance (in percent) for the bands 450-500, 500-550, 550-600, 600-650, 650-700, 700-750, 750-800, 800-850, 850-900, and 900-950 nm. The bands 450-500, 650-700, and 850-900 nm in these files are identical to the equivalent wavelength bands in the COLxxxx.FIN files. A subdirectory (DATA) of the COLOR directory contains the full set of 511 channel reflectance data. These data files are sorted by site, hole, core, and section, with file names such as "849B11H2.REF" to denote the reflectance data for Site 849, Hole B, Core 11, Coretype H (meaning APC), Section 2. The first part of each data line is the standard ODP sample identification string as noted above, followed by one column denoting sensor-to-core distance offset from the optimum point (in arbitrary units), followed by 511 columns of reflectance data (in percent). Each file contains a four line header which identifies the local time and date of measurement, the name of the file containing the uncorrected instrument counts for samples and standards, measurement parameters, and the equation to calculate wavelength for each channel. A typical equation in this header would read as follows: Lamda(nm)=-.963(Pixel#+Offset%)+945.5 Offset = 0 which means that the wavelength for data column 1 would be 944.5 nm, and the wavelength for data column 511 would be 453.4 nm. GRAPE. This directory contains four types of data files: Data files with names such as 'GR849B.DAT' contain the original GRAPE density data for a given site (in this case Site 849 Hole B). Each line contains the standard ODP sample identification followed by the measured GRAPE density. The last two columns of integer data are from the GRAPE processing program. Data files with names such as 'GR849B.FIN' are the data files processed first by the program FIXGRAPE and then the program GRAPECOR. The first program averages replicate measurements as well as calculates a guassian smoothed GRAPE record. Each line contains the standard ODP sample identification followed by the measured GRAPE density, the guassian smoothed density and finally the depth of the sample in composite depth units MCD. (These data files were generated by using the program DEP_ADJ and output from the program FIXGRAPE). Finally, the GRAPE densities are correct for the fact that a single attenuation coefficient is used in the GRAPE processing software. This results in the density of water being defined as 1.128 g/cc. In these file following the standard sample indentification string there are three fields of seven characters which give: the composite depth of the sample (in mcd), the measured GRAPE density, the corrected GRAPE density and the gaussian smoothed corrected GRAPE density. Data files with names such as 'GR849.MCD' contains the composite GRAPE data for Site 849. These types of data files were generated with program SPLICE. The first column of the data is depth in composite (MCD) followed by GRAPE (uncorrected) density and then smoothed GRAPE density. The last set of columns gives the standard ODP sample information. Data files with names such as 'GR849.MBS' contains the composite GRAPE data for Site 849 in which the depth of the composite has been rescaled to be equivalent to MBSF depth units. This data file was generated with the program MBSFSPLI. There are four columns of data in these files, MBSF, GRAPE, smoothed GRAPE and original MCD of the data. SUS. This directory contains the susceptibility data for the site. Data files with names such as 'SUS849B.FIN' are the data files processed by the program FIXGRAPE (as applied to susceptibility data). Each line contains the standard ODP sample identification including depth MBSF followed by the measured magnetic susceptibility and finally the depth of the sample in composite depth units MCD. (These data files were generated by using the program DEP_ADJ and output from the program FIXGRAPE). LOGS. This directory contains the results of the downhole measurements program conducted at the site. Files include 'ACT_GST.###' (geochemical yield logs), 'DIT_SDT.###' (resistivity logs), EL_ERROR.###' (elemental errors for geochemical logs), GEOCHEM.###' (geochemical logs for K, Th, and U), GPIT.### (magnetic field measurements), 'NGT_LDT.###' (natural gamma tool), 'OX_ERROR.###' (errors for processed oxide data), 'OXIDES.###' (processed oxides data giving oxides of Si, Ca, Fe, Ti, K and Al), and 'XRF.###'. A separate 'readme' files (LOGS.ACR, LOGTOOLS.ACR, OXIDES.LOG) help explain the parameters contained in the log files. Each data file in the LOGS directory contain three lines of header information. PP. This directory contains the results of the physical properties analysis. All files contain a three line header labeling the data columns. Each data line contains the standard ODP sample identification string. The files 'INDEX.###' contain sediment index properties. Following the sample identification in fields of 7 characters are the following variables: depth in the composite depth section (mcd), wet-bulk density (gm/cm3), dry bulk density (gm/cm3), grain density (g/cm3), porosity (%), wet water content (%), dry water content (%), and void ratio. The files 'COMPVEL.###' contain the compressional-wave velocity data. Variables include depth in the composite depth section (mcd) and sound velocity (m/s) (variables are written in fields of seven characters after the standard ODP sample identification string). The files 'THERMCON.###' contain the thermal conductivity data. Variables include depth in the composite depth section (mcd) and thermal conductivity (variables are written in fields of seven characters after the standard ODP sample identification string). The files 'VANESHEA.###' contain the vane-shear results. Variables include depth in the composite depth section (mcd) and sediment shear strength in (kPa). Variables are written in fields of seven characters after the standard ODP sample identification string).