Figure F7. Core image close-up of sediment, Hole U1357A (interval 318-U1357A-7H-2, 55–63 cm). Textures are produced by degassing of H2S and CH4 from diatom and organic carbon–rich sediment. Gas release opens up small pockets and fractures that form along natural bedding surfaces and sometimes aggregate and cross-bedding surfaces to form larger (2–5 mm) voids in the core. These features pose a challenge for the use and interpretation of standard track-based logging systems (e.g., magnetic susceptibility and GRA density).
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