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- W2891726658 endingPage "155" @default.
- W2891726658 startingPage "127" @default.
- W2891726658 abstract "This chapter deals with the micromorphological characteristics and interpretation of pedogenic siliceous features in soils and regoliths. Pedogenic siliceous features occur as crystalline forms, such as quartz, tridymite, and cristobalite, and as poorly ordered or non-crystalline forms, such as opal-A and opal-CT. Silica may be concentrated in varying degrees through weathering, vertical and lateral translocation, and precipitation and dissolution, resulting in the formation of cemented horizons (silcretes and duripans) and non-cemented or poorly cemented horizons (fragipans). Typic coatings, infillings, and nodules, mainly consisting of opal, are commonly observed in fragipan thin sections. In duripans and silcretes, the most common pedofeatures are typic and laminar coatings and infillings with various silica phases such as opal, opal-CT, cristobalite, chalcedony, and non-fibrous microcrystalline quartz. Transformation of poorly ordered to more crystalline forms with aging is frequently observed. Dissolution of quartz is commonly observed in strongly weathered materials." @default.
- W2891726658 created "2018-09-27" @default.
- W2891726658 creator A5009755720 @default.
- W2891726658 date "2018-01-01" @default.
- W2891726658 modified "2023-09-27" @default.
- W2891726658 title "Pedogenic Siliceous Features" @default.
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