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doi:10.2204/iodp.proc.338.202.2015 Data report: porosity and pore size characteristics of sediments from Site C0002 of the Nankai Trough determined by mercury injection1Brandon Dugan2AbstractMercury injection capillary pressure (MICP) measurements constrain pore-scale physical properties of mud(stone) bulk cuttings (>4 mm fraction) and core samples from Integrated Ocean Drilling Program Site C0002. Core samples from 221–464 meters below seafloor (mbsf) in the Kumano forearc basin have porosities of 0.40–0.56, median pore throat radii of 0.077–0.205 µm, and air-water capillary entry pressure of 93–599 kPa. The porosity of these core samples is similar to shipboard porosity determined from moisture and density (MAD) analyses. Bulk cuttings (>4 mm size fraction) from 928 to 1980 mbsf in the inner wedge of the accretionary prism have porosity of 0.21–0.44, median pore throat radii of 0.021–0.032 µm, and air-water capillary entry pressure of 119–982 kPa. The porosity of these bulk cuttings is lower than the MAD-determined porosity on bulk cuttings from the same size fraction but is consistent with core-based, MAD-derived porosity from Hole C0002B and with MAD-derived porosity on intact, undisturbed cuttings. Core samples across the lithologic Unit III–IV transition document porosity of 0.34–0.42, median pore throat radii of 0.041–0.076 µm, and air-water capillary entry pressure of 121–979 kPa. These results suggest that in situ porosity can be estimated from core samples, intact undisturbed cuttings, and/or MICP analyses. Additional postexpedition research will help relate median pore throat radii and capillary entry pressure data to transport properties of these mud(stones). |
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