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- W128234414 abstract "The cementing agents in siliceous hardpans, granitic saprolites and hard-setting Alfisol E horizons were examined using micromorphological, SEM/EDXRA, TEM/EDXRA and EMPA methods. Siliceous glaebules and silans were observed in the hardpan samples and in clay enriched bands in saprolite. Alfisol E horizon samples have a dense silasepic fabric, common fine grainy cutans and a few, somewhat isotropic, clay/silt bridges between quartz grains. SEM/EDXRA observations show that the hardpan cements are highly siliceous and have a low aluminium content. Grain bridging structures in the Alfisol E horizons have Si/AI ratios of 3:1 to 15:1 suggesting the presence of silica-rich phases. TEM/EDXRA analyses indicated that in all the samples, mixtures of discrete particles of crystalline clay minerals and amorphous silica occur. Amorphous silica was clearly the major cementing agent in both the hardpan and the saprolite samples examined. In the Alfisol E horizons the results indicate that soluble silica and possibly precipitated aluminosilicates may play some role in hard-setting, although there are not enough of these materials present to overcome slaking processes on wetting." @default.
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- W128234414 date "1990-01-01" @default.
- W128234414 modified "2023-10-07" @default.
- W128234414 title "Properties of Siliceous Cements in some Australian Soils and Saprolites" @default.
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- W128234414 doi "https://doi.org/10.1016/s0166-2481(08)70331-3" @default.
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