The alteration logs provide a record of bulk-rock alteration (Shipboard Scientific Party, 2001). Each entry identifies the igneous unit; the core, section, piece, and interval; the length of each piece; and the depth below the seafloor of the top of each piece. Alteration type was classified on the basis of rock color for each piece and calibrated by thin section observations. In addition, alteration of olivine phenocrysts was reported when observed and includes an estimation of the degree of replacement by secondary minerals (in percent) and the type of secondary minerals. Further information on the abundance (in percent) and mineral fillings of vesicles and miarolitic cavities was entered when possible. A column for comments is included in the log for information of interest not easily placed under existing headings (see the "Supplementary Material" contents list for the alteration logs).
The vein logs provide a record of all veins observed on the cut surface of the cores (Shipboard Scientific Party, 2001). Each entry identifies the igneous unit; the core, section, and piece; and the depth below the seafloor of the top of the vein. Specific information for each vein includes the apparent orientation, width (in millimeters as measured on cut surfaces), the locations of the top and bottom, vein length (calculated as the difference between the location of top and bottom), and mineral content of the vein (in percent). We also recorded the presence or absence of a related alteration halo and the color, half width (in millimeters), and alteration mineralogy of halos. Once again, a column for comments is included in the log for information of interest not easily placed under existing headings (see the "Supplementary Material" contents list for the vein logs).