Micromorphology and composition of silica accumulations in a hardpan

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Abstract

The morphology and composition of silica coatings and silica impregnations in a hardpan underlying a desert loam from north-western New South Wales were examined. Optical properties and electron microprobe analyses indicate that these features were composed of opal-A. The coatings were remarkably pure, being 99.1% SiO2. X-ray maps indicate that the silica impregnations were also calcite depletion pedofeatures. Even at high magnifications in scanning electronmicroscopy, the silica coatings had a dense, vitreous appearance with few voids. The original plant cell structure in silicified root remnants was remarkably well preserved. 

Original languageEnglish
Pages (from-to)845-853
Number of pages9
JournalDevelopments in Soil Science
Volume22
DOIs
Publication statusPublished - 1993
Externally publishedYes

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