Fig. 7

Comparison between the NGR logs normalized using porosity estimated from the electrical resistivity logs and the clay mineral fractions. The panels show results from the a incoming sites, b toe sites, c slope sites, d outer ridge sites, e Kumano Basin sites, and f all sites combined. Color code (red, green, and light blue) for dots in Fig. 7 is common to that used for lithological units in Figs. 2, 3, 4, 5, 6. Red dots represent the standard sediments, for which the empirical conversion function is established. Green dots represent the upper part of USB sediments or the slope apron facies younger than 1.5 Ma, which shows higher normalized NGR log values than the standard sediments possibly due to volcanic ashes included in sediments. Light blue dots are the inner prism sediment below the Kumano Basin, which shows lower NGR log values than the standard sediments possibly due to poor hole condition. Grey dots indicate all data