Figure 3

Depth profiles of natural gamma-ray intensity in Holes C9025A and C9026A. Red lines are gamma-ray intensity measured by the PPS71 instrument in the drill holes and open circles are onboard multisensor core logger measurements of recovered drill cores³¹. Areas shaded brown, green and pink represent intervals of the subseafloor sulphide body with intercalated hemipelagic sediment, continuous occurrences of K-feldspar and melting of the inner plastic liner at the high temperatures of the coring operation (interpreted as a hydrothermal fluid channel), respectively. Patterns of the gamma-ray intensities at both holes are quite similar (blue arrows and dotted lines).