Figure F2. Compilation of physical and geochemical properties for Site 801 basement (Pockalny and Larson, 2003). The volcanic section is divided into eight units (left column) on which the ages of the basement have been superimposed (Koppers et al., 2003). Representative geophysical logging measurements are shown overlain on basement stratigraphy to illustrate the correspondence between the various parameters. Sequences I–III are interpreted as being erupted slightly off-axis, while the deeper sequences IV–VIII are assumed to be more characteristic of ocean crust emplaced at a fast spreading ridge axis. Zirconium compositions (Kelley et al., 2003) have been used to define the basement sequences. Note the trend toward low Zr (more primitive compositions) in sequences IV–II (no Zr abundances are given for the alkaline lavas in sequence I). Lava flow frequency (number of volcanic units per 10-m section) is calculated from Formation MicroScanner (FMS) data (Pockalny and Larson, 2003).

Figure F2. Compilation of physical and geochemical properties for Site 801 basement (Pockalny and Larson, 2003). The volcanic section is divided into eight units (left column) on which the ages of the basement have been superimposed (Koppers et al., 2003). Representative geophysical logging measurements are shown overlain on basement stratigraphy to illustrate the correspondence between the various parameters. Sequences I–III are interpreted as being erupted slightly off-axis, while the deeper sequences IV–VIII are assumed to be more characteristic of ocean crust emplaced at a fast spreading ridge axis. Zirconium compositions (Kelley et al., 2003) have been used to define the basement sequences. Note the trend toward low Zr (more primitive compositions) in sequences IV–II (no Zr abundances are given for the alkaline lavas in sequence I). Lava flow frequency (number of volcanic units per 10-m section) is calculated from Formation MicroScanner (FMS) data (Pockalny and Larson, 2003).