Temporal Changes in Pore Structure of Sandstone Gravel Due to Weathering.

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  • 風化による砂岩れきの間隙構造の時間変化
  • フウカ ニ ヨル サガンレキ ノ カンゲキ コウゾウ ノ ジカン ヘンカ

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Temporal changes in pore structure due to weathering during 350ka were examined using sandstone gravel in fluvial terrace deposits which were distributed in the Miyazaki Plain, south Kyushu. The time between the age of each terrace formation and the present was assumed to be the weathering period.<BR>Using rock samples taken from the outcrop in each terrace, (1) microstructure of rock samples were observed through an optical microscope and X-ray CT Scanning analysis, (2) specific gravity and effective porosity of the samples were measured, and (3) pore size distribution (PSD) of rock samples were measured by a mercury intrusion porosimetry.<BR>Main results are summarized as follows: (1) the optical microscope observation shows that pores are connected due to weathering, (2) the CT values decrease with increasing weathering period, (3) the specific gravity decreases and the effective porosity increases with increasing weathering period, and (4) the pore radius and the pore volume increases with increasing weathering period, (5) the specific surface area increases with constant rate during 350ka. These results suggest that increasing of pores in gravel with increasing weathering period is derived from leaching of the matrix minerals with a small specific surface area.

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