抄録
For the better understandings of compaction and porosity reduction in accretionary complex, pore structures in accreted sediments were analyzed by a Laser Scanning Microscope (LSM). Mudstones and sandstone taken from the Creraceous and Tertiary shimanto Bells, and siltstones taken from the Neogene sediments in the Boso Peninsula were used for this analysis. Porosities of these samples measured by Helium Pycnometer and by Mercury Injection method range from c. a. 2% to 40% To visualize the pore spaces, we used the method proposed by Fredrich et al. (1995). The samples were impregnated with an ultra-low viscosity epoxy resin doped with a fluorchrome of Rhodamine B. Using a LSM, optical slices of fluoresent lights in the samples, excited by the green Kr-Ar laser beams with the wavelength of 568 nm, were directly obtained as digital images. Three-dimensional pore structures were reconstructed
