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- W2350862209 abstract "A total of 614 sediment samples at an interval of about 1.5 m from all 5 sites of the Integrated Ocean Drilling Program (IODP) Expedition 311 on Cascadia Margin, northwestern Pacific were analyzed using a Beckman Coulter LS-230 Particle Analyzer. The grain-size data were then plotted against depth and compared with other potential proxies of gas hydrate-occurrence such as soupy/mousse-like fabrics in sedimentary textures, gas hydrate concentration (Sh) derived from LWD data using Archie’s relation, IR core images (infrared image) and the recovered samples of gas hydrate-bearing sediments. A good relationship was found between the distribution of coarse grains (sizes 31~63 μm and 63~125 μm) and the potential occurrence of gas hydrate across the entire gas hydrate stability zone (see the yellow zones in following 5 diagrams). For example, the depth distribution of grain size from the Site U1326 shows clear excursions at depths of 5~8, 21~26, 50~123, 132~140, 167~180, 195~206 and 220~240 mbsf. They coincide with the potential occurrence of gas hydrate indicated by soupy/mousse-like structures, logging-derived gas hydrate concentrations (Sh) and the recovered samples of the gas hydrate bearing sand layers. Therefore, sediment-size may have played a role in the concentration of gas hydrate. Gas hydrate occurs preferentially in relatively coarse-grained sediments (31 μm in grain size)." @default.
- W2350862209 created "2016-06-24" @default.
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- W2350862209 date "2007-01-01" @default.
- W2350862209 modified "2023-09-23" @default.
- W2350862209 title "Grain Size Constraint on Gas Hydrate Occurrence: Evidence from Sediment Size during IODP 311" @default.
- W2350862209 hasPublicationYear "2007" @default.
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