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doi:10.2204/iodp.proc.338.201.2014 Data report: particle size analysis of Nankai Trough sediments, IODP Expedition 338 Site C00211Zachary T. Moore2 and Derek E. Sawyer3AbstractHydrometer analysis of 49 sediment samples from Integrated Ocean Drilling Program (IODP) Expedition 338 Site C0021, offshore Japan, indicates two lithologies: clayey silt (80% of samples) and silty clay (20% of samples). Samples were collected at approximately 1 sample per 2 m from 0.06 and 83.6–193.7 meters below seafloor. Samples were selected with the primary objective of determining particle size distribution within two mass transport deposits (MTD-A and MTD-B) and to establish the background “non-MTD” particle size distribution. We performed hydrometer analyses because of the fine-grained nature of the sediments. Clayey silt is composed primarily of silt-size particles (>50 wt%) with 25–50 wt% clay-sized particles and <20 wt% sand-sized particles. Silty clay is composed primarily of clay-sized particles (50 wt%) with 25–50 wt% silt-sized particles and <20 wt% sand-sized particles. Samples from MTD-A plot within the silty clay and clayey silt fields, whereas samples from MTD-B plot exclusively in the clayey silt field. |
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